Why The Powerful Earthquake That Just Struck Italy's Supervolcano Has The Country In Panic

Añadido: 2026-05-26

[00:00:00]The volcanologist was on the phone with her counterpart in Naples when the monitoring screens lit up simultaneously. She had been in the middle of describing the previous night's seismic data, the sequence of small earthquakes that had been accumulating beneath the Campi Flegrei caldera in patterns that she and her colleagues had been discussing with increasing frequency over the previous weeks when the automated alert tones from multiple instruments triggered at once and she stopped mid-sentence and looked at the screens and said nothing for a long moment. Her counterpart in Naples, who was looking at the same data from the INGV the Osservatorio Vesuviano monitoring center 60 km away, also said nothing.

[00:00:35]The magnitude readout on the main seismic screen was climbing as the processing algorithms refined the solution and they both watched it climb in the silence that falls between scientists when the data is producing something that exceeds the threshold of anything they want to be looking at. The magnitude settled at 4.4. The epicenter was in the western section of the caldera in the area of maximum uplift that the ground deformation monitoring had been documenting for months. The depth was approximately 2 km, shallow in the way that means the energy release is concentrated close to the surface and the ground motion at the surface is correspondingly intense.

[00:01:09]The waveform on the seismogram was impulsive, a sharp clean signal consistent with a brittle tectonic rupture rather than the more emergent lower frequency signals that characterize fluid-driven seismicity or volcanic tremor. This was not a volcanic earthquake in the strict sense of a seismic event generated by the movement of magma. This was the crust of the Campi Flegrei caldera rupturing under stress and the stress it was rupturing under was the accumulated product of a ground inflation episode that had been building for years and that had, in the preceding months, been producing ground displacement rates that the historical monitoring record for the caldera had not previously documented. The duration of the phone call that followed the earthquake, the one that had begun as a routine discussion of the previous night's data, was 47 minutes.

[00:01:52]At the end of it, the two volcanologists had agreed that the INGV monitoring team needed to convene an emergency assessment meeting within the next 4 hours, that the Civil Protection Authorities in Naples needed to be notified immediately, and that the alert level for Campi Flegrei needed to be reviewed in light of the current event.

[00:02:07]They had also agreed on something that they did not state explicitly, but that was present in the tone and the careful language of everything they said, which was that the earthquake they had just observed was the largest recorded at Campi Flegrei since the crisis period of the early 1980s, that it forced the evacuation of 37,000 people from the town of Pozzuoli, and that the circumstances in which it had occurred were in several respects more concerning than the circumstances of the 1980s crisis. Not because the current earthquake was necessarily the precursor to an imminent eruption, but because the physical state of the caldera and the history of its behavior over the past several decades created a context in which the current event could not be treated as simply another entry in the catalog of Campi Flegrei seismicity.

[00:02:49]Italy was not yet in panic when the phone call ended. The panic would come later when the news of the earthquake reached the population of the Naples metropolitan area through the media, the social networks, and the specific visceral experience of feeling the ground shake in a city that sits on the surface of a caldera that last erupted in 1538, and that every resident of Naples has grown up knowing is a geological feature capable of far more than what the modern era has produced from it. But the scientists were already in the specific state that precedes the public panic by hours, the state of focused, disciplined alarm that motivates the rapid convening of expert assessments, and the careful escalation of communication to the authorities who will decide what the public is told, and what the emergency management response will be.

[00:03:33]Campi Flegrei is not a familiar name to most people outside Italy, and even within Italy, it is less famous than the more visible volcanic threat of Vesuvius on the other side of Naples Bay. But Campi Flegrei, the burning fields, is in several respects the more scientifically alarming of the two volcanic systems, and the distinction between them is important for understanding why the earthquake that struck the caldera has generated the level of concern it has.

[00:03:57]Vesuvius is a stratovolcano, a conical mountain built up by the accumulation of lava flows and pyroclastic deposits from its eruptive history, with a visible summit crater that announces its volcanic nature to anyone looking at the landscape. The hazard from Vesuvius is well characterized and heavily studied, driven by the historical record of its eruptions, including the catastrophic 79 AD eruption that buried Pompeii and Herculaneum, and that provides one of the most vivid and well-documented examples of volcanic catastrophe in the ancient world.

[00:04:28]The volcano has erupted multiple times since then, most recently in 1944, and the eruption history provides the framework within which the current monitoring of Vesuvius is conducted, and the emergency plans for the communities in its shadow are calibrated. Campi Flegrei is different in character and in the specific nature of the threat it poses.

[00:04:45]It is not a single mountain, but a caldera, a roughly circular depression approximately 13 km in diameter formed by the collapse of the ground surface after a catastrophic eruption approximately 39,000 years ago emptied the magma chamber beneath what is now the western outskirts of Naples.

[00:05:01]The caldera rim is not a dramatic escarpment visible from a distance, but a subtle topographic feature largely buried under the cities and towns that have been built across it, including the ancient Roman city of Puteoli, now Pozzuoli, and the modern communities of Bagnoli, Quarto, and Monte di Procida that together with the historic town of Pozzuoli constitute the dense urban fabric of the Phlegraean Fields. Within this caldera lives a population of approximately 500,000 people who inhabit a landscape that sits directly above a magmatic system that has been in a state of unrest for decades, and whose most recent cycle of activity, the Bradyseismic crisis of the 1980s, produced the largest ground uplift and the most intense seismicity in the caldera's modern monitoring history, and resulted in the precautionary evacuation of tens of thousands of residents from the most exposed areas.

[00:05:49]The memory of that evacuation is part of the living history of the Pozzuoli community, something that the older residents experienced personally and that the younger ones grew up knowing was part of their town's past and potentially its future. The broader Naples metropolitan area, which surrounds the Campi Flegrei caldera and which extends to the slopes of Vesuvius on its eastern side, has a population of approximately 3 million people.

[00:06:10]The specific hazard scenario for a major Campi Flegrei eruption, in terms of the geographic distribution of the impact and the population at risk, dwarfs the Vesuvius scenario for all but the most extreme Vesuvius events. A major Campi Flegrei eruption, depending on its size and character, could produce pyroclastic flows and ash fall and toxic gas releases across much of the Naples basin and could require the evacuation of a significant fraction of the metropolitan population on time scales that the current emergency plans characterize as extremely challenging to execute, given the density of the urban fabric, the capacity of the transportation infrastructure, and the physical constraints of moving large numbers of people out of a partially enclosed coastal basin on the short notice that the precursory signals of an eruption might provide.

[00:06:55]The specific geological character of the Campi Flegrei caldera and the physical processes that are driving its current unrest are the foundation for understanding why the earthquake produced the reaction it did and why the scientific and civil protection communities are treating the current situation with the urgency it is receiving.

[00:07:11]The Campi Flegrei caldera is underlain by a magmatic system that, unlike the relatively simple plumbing of a strato volcano like Vesuvius, consists of a complex network of magma bodies, hydrothermal fluids, and hot rocks that interact with each other in ways that produce the surface manifestations of unrest without necessarily involving the direct descent of fresh magma from depth.

[00:07:32]The surface expressions of this system include the numerous fumarolic vents that dot the caldera floor and walls, most prominently in the Solfatara crater area that has been a tourist destination for centuries due to its otherworldly landscape of steaming ground and sulfurous emissions and the persistent ground deformation that is the most distinctive and most carefully monitored feature of the caldera's behavior. The ground deformation at Campi Flegrei is driven by a process that geologists call bradyseism from the Greek words for slow and earthquake, which refers to the slow uplift and subsidence of the caldera floor that occurs over years to decades in response to changes in the pressure of the magmatic and hydrothermal fluids beneath the caldera.

[00:08:12]When the fluid pressure increases, the caldera floor rises. When it decreases, the caldera floor subsides. The uplift and subsidence cycles have been occurring at Campi Flegrei for centuries as documented by the famous example of the Temple of Serapis in Pozzuoli, whose columns show the clear evidence of repeated submersion and emergence in the marine intertidal zone as the caldera floor rose and fell over the past 2,000 years. The modern monitoring record, which extends back to the 1960s with continuous ground deformation measurements, documents two major uplift episodes that were associated with significant seismicity and that produced sufficient concern to trigger emergency management responses.

[00:08:48]The first, from 1969 to 1972, produced approximately 1 m of uplift and resulted in the temporary evacuation of some residents from Pozzuoli.

[00:08:58]The second, from 1982 to 1984, produced approximately 1.8 m of uplift and was associated with more intense seismicity, including several earthquakes above magnitude 4, that prompted the full evacuation of approximately 37,000 residents from the most vulnerable parts of Pozzuoli. After 1984, the caldera entered a period of slow subsidence that lasted for several years, then a period of intermittent small uplift episodes that each produced some centimeters of uplift before reversing.

[00:09:26]This pattern of relative quiescence punctuated by minor unrest episodes that never approached the scale of the 1982 to 1984 crisis continued into the 2000s and early 2010s and created in the public consciousness and in the operational planning of the emergency management community a baseline expectation of manageable unrest that did not pose an imminent eruption threat. What has changed in the current period, the change that is the essential context for understanding the significance of the earthquake and the panic it has produced, is that the caldera is no longer in the pattern of modest intermittent unrest that characterized the three decades after the 1984 crisis.

[00:10:02]The current uplift episode, which began accelerating in approximately 2020, has now produced more than 1 m of total uplift in the most affected parts of the caldera, bringing the total cumulative uplift since the 1984 maximum to a level that is approaching the pre-eruptive ground levels of the caldera's historical eruption record.

[00:10:21]And unlike the brief episodes of the post-1984 period, the current episode has not reversed. The ground continues to rise. The rate of rise has been accelerating, and the earthquake that struck the caldera has occurred in this context of an accelerating non-reversing uplift episode whose cumulative magnitude is approaching the range that the geological record associates with eruption precursory behavior at this caldera. The seismic crisis of the 1980s provides the most direct comparison for the current situation.

[00:10:49]And the specific ways in which the current situation resembles and differs from the 1980s are the dimensions that the volcanologists assessing it are focusing on most carefully. The resemblances are concerning. The magnitude 4.4 earthquake is, as noted, the largest recorded at Campi Flegrei since the 1980s crisis period. The cumulative seismicity of the current unrest episode, measured in both the number of events and the total seismic energy release, has been increasing at a rate that the 1984 precautionary evacuation was based on exceeding. The ground deformation rates in the most recent months have been comparable to or exceeding the rates that were recorded at the peak of the 1982 to 1984 uplift episode.

[00:11:29]The geochemical indicators of the hydrothermal system, particularly the temperature and composition of the fumarolic emissions from the Solfatara and other vent areas, have been showing changes consistent with increasing magmatic gas input into the hydrothermal system. A change that is interpreted as reflecting the ascent of hot, gas-rich fluids from the magmatic zone below the hydrothermal system. The differences between the current situation and the 1984 crisis are in some respects reassuring, and in others more concerning.

[00:11:57]On the reassuring side, the monitoring capability available today is vastly superior to what was available in the 1980s, enabling a more precise characterization of the source processes and a more reliable assessment of whether specific thresholds of concern are being approached. The understanding of the Campi Flegrei system has advanced substantially since the 1980s, providing a more complete framework for interpreting the observed changes and for distinguishing between the scenarios that culminate in an eruption and those that do not.

[00:12:25]The emergency planning has been substantially improved with the development of detailed evacuation plans, the investment in evacuation route infrastructure, and the establishment of the traffic light alert system that provides a clear, graduated communication of the hazard level to the public and to the emergency management agencies. On the more concerning side, the cumulative uplift of the current episode, when added to the uplift that did not fully reverse after the 1984 crisis, has brought the caldera floor to an elevation that is higher than at any point in the modern monitoring record, and that is approaching the range associated with historical eruption precursory behavior.

[00:13:00]The implications of this cumulative uplift are debated within the volcanological community, but one dimension of the debate that is not disputed is that the cumulative uplift reflects the progressive pressurization of the magmatic system beneath the caldera, and that higher pressurization means less additional pressurization is needed to initiate the processes that could culminate in an eruption.

[00:13:20]The caldera is, in a specific and physical sense, more full than it was in 1984, and a full caldera requires less additional input to overflow. The The population density in the caldera and its surroundings has also increased since the 1980s, reflecting the growth of the Naples metropolitan area over four decades of demographic change. The 500,000 people living within the caldera and the 3 million in the broader metropolitan area represent a larger and more complex evacuation challenge than the emergency plans of the 1984 crisis were designed for. And the assessment of whether the current plans are adequate for the potential scenarios at the upper end of the concern distribution is one of the specific issues that the civil protection authorities have been working through with the scientific community over the past year. The alert level system that governs the emergency management response to Campi Flegrei unrest is a four-level traffic light system with green representing normal background activity, yellow representing unrest that requires heightened monitoring and preparedness, orange representing a significant escalation that requires active emergency response preparation and the readiness for evacuation, and red representing an imminent eruption threat that triggers the full evacuation protocol.

[00:14:30]The caldera has been at yellow alert level since 2012 when the current unrest episode first became distinct from the background. And the question of whether the current earthquake and the current state of the monitoring data warrant an upgrade to orange has been the specific question under discussion since the emergency assessment meeting convened in the hours following the earthquake. The decision to upgrade an alert level is not a purely scientific one.

[00:14:52]It is a decision that involves the integration of the scientific assessment with the operational and social dimensions of what an alert level upgrade means for the population and for the emergency management system.

[00:15:03]An upgrade to orange does not immediately trigger mass evacuation, but it does trigger a series of pre-evacuation preparedness activities.

[00:15:11]The verification and activation of the evacuation route management, the opening of reception centers, the notification of vulnerable populations who require assisted evacuation, and the initiation of the public communication that prepares the population for the possibility of a full evacuation order.

[00:15:27]These activities have real costs in economic disruption and the emotional and psychological burden on the population that is asked to prepare for a potentially major disruption to their lives and in the consumption of emergency management resources that are not unlimited. The scientific assessment that went into the emergency meeting was not a simple verdict. The volcanologist presenting the data described a system that was showing multiple indicators of elevated concern, that the earthquake was within the range of the largest events observed during the most serious historical unrest episode, that the cumulative uplift had reached a level with historical significance, that the geochemical changes in the fumarolic emissions were consistent with increasing magmatic input. They also described the genuine uncertainties in the assessment, that the caldera had shown comparable unrest episodes in the past without erupting, that the specific processes driving the current unrest were not definitively established as magma ascent rather than hydrothermal pressurization, and that the predictive models for Campi Flegrei behavior had inherent limitations that made confident near-term forecasting impossible. The civil protection authorities who received this assessment had to make a decision under genuine scientific uncertainty about a situation with potentially severe consequences in either direction.

[00:16:37]The decision to upgrade would trigger costly and disruptive preparedness activities that might prove unnecessary if the unrest subsided.

[00:16:44]The decision not to upgrade would leave the emergency management system in a state of readiness calibrated to a lower threat level if the situation escalated rapidly.

[00:16:52]The asymmetry of consequences, the severe harm that could result from inadequate preparation for an actual escalation versus the manageable disruption that would result from unnecessary preparedness, pointed in one direction.

[00:17:05]The alert level was upgraded to orange.

[00:17:07]The public reaction to the alert level upgrade and to the news of the earthquake itself was, as the scientists and the civil protection authorities had anticipated, characterized by fear.

[00:17:16]The specific quality of the fear in Naples and in the communities of the Phlegraean Fields is difficult to convey to people who have not spent their lives in the shadow of a caldera because it is not the abstract fear of a remote statistical possibility, but the lived familiarity with something that is part of the landscape and the culture that is taught in schools and referenced in conversations, and that occasionally, in the specific way that the ground moving beneath your feet makes it real, asserts itself as something more immediate than background knowledge. The evacuation traffic that appeared on the roads out of the Phlegraean Fields communities in the hours following the earthquake and the alert level upgrade was not an official evacuation. No evacuation order had been issued. The traffic was the spontaneous response of residents who had decided, without waiting for official guidance, to take their families to relatives or hotels in other parts of the region. The specific individual response to a situation in which the official guidance had said that conditions were at the orange alert level and the earthquake had been felt strongly in their homes.

[00:18:13]The spontaneous movement was understandable and in some respects consistent with the preparedness messaging that the emergency management system had been promoting, which emphasized that residents should be aware of the evacuation routes and should be prepared to move quickly if an evacuation order was issued. But, it also complicated the emergency management picture because the spontaneous movement created congestion on the routes that would be needed for the official evacuation if one became necessary, demonstrating in real time one of the most challenging aspects of managing a large-scale evacuation in a densely populated urban area. The media coverage of the earthquake and the alert level upgrade amplified the fear in the way that dramatic breaking news always amplifies fear, providing the visual imagery of cracked walls and broken glass from the earthquake, the interviews with frightened residents, and the commentary from scientists who, in the compressed time scale of live news, sometimes conveyed the genuine scientific uncertainty in ways that were more alarming than they intended. The social media environment added additional layers of information and misinformation with genuine scientific updates from the INGV sharing the same platforms as apocalyptic speculation and historical comparisons to the largest Campi Flegrei eruptions that were not relevant to the current scenario, but that were visually dramatic and easily shared. The INGV Osservatorio Vesuviano's response to the public information environment was the rapid publication of the formal technical assessment that had been produced in the emergency meeting, a document that described the current monitoring data, the scientific assessment of what it indicated, the genuine uncertainties in that assessment, and the rationale for the alert level upgrade. The publication was intended to provide a factual baseline for public communication that would compete with the speculation and the fear-amplifying content in the media environment. Its effectiveness in achieving this goal was partial, which is the typical outcome of technical communication in an act of emergency, but its existence established a clear and authoritative record of what the scientific community actually knew and what it did not know, which served the important function of providing accurate information to the people who were looking for it. The scientific question that the earthquake has sharpened, the question that is the core of the ongoing assessment at INGV and at the university research groups and the international collaborators who are contributing to the analysis, is whether the current state of the Campi Flegrei system represents a qualitative change in its trajectory or whether it represents an unusually intense but ultimately reversible episode of unrest. This distinction between a system that is on a path toward eventual eruption and a system that is in a transient excursion from which it will return to background conditions is the fundamental question in the scientific assessment of any volcanic unrest, and it is the question to which the scientific community can almost never provide a definitive answer until after the system has demonstrated which path it was on. The evidence for the qualitative change interpretation comes from the specific combination of the cumulative uplift reaching historically significant levels, the acceleration rather than deceleration [clears throat] of the current episode, the earthquake occurring at a depth and magnitude that indicate the accumulation of significant stress in the shallow crust, and the geochemical changes that indicate increasing magmatic input into the hydrothermal system.

[00:21:13]Each piece of evidence individually is consistent with a reversible excursion from normal conditions.

[00:21:18]The combination of all of them in the context of the long-term history of the caldera and the physical models that the research community has developed for its behavior is what the scientists are finding more difficult to interpret as simply a transient episode. The evidence for the reversible excursion interpretation comes from the precedents in the caldera's own history, particularly the 1982 to 1984 crisis that had many of the same characteristics as the current episode and that did not culminate in an eruption. It also comes from the general observation that many volcanic systems show episodes of intense unrest that ultimately resolve without eruption.

[00:21:52]And that the presence of multiple indicators of elevated concern is not by itself a reliable predictor of the eruption outcome, rather than the resolution without eruption outcome. The caldera has been through this before and has not erupted. The base rate of unrest episodes resolving without eruption across the documented history of Campi Flegrei and of comparable caldera systems around the world is high enough that any specific episode is statistically more likely to resolve than to erupt. Both of these bodies of evidence are genuinely present in the scientific assessment. And the scientists conducting the assessment are holding them simultaneously without forcing a premature resolution in either direction.

[00:22:28]This is scientifically correct behavior, but it is also the behavior that makes the communication of the assessment to the public and to the emergency management authorities most challenging.

[00:22:38]Because the honest scientific answer to the most pressing questions is an eruption coming, and if so, how soon, is a probability range rather than a yes or no. And probability ranges are harder to communicate effectively than binary answers. The Italian government's response to the earthquake and the alert level upgrade has been the activation of the civil protection mechanisms that exist specifically for this scenario.

[00:23:00]The coordination between the Dipartimento della Protezione Civile at the national level and the regional and local authorities in Campania and Naples, the communication of the updated situation to the population of the alert zone, and the review of the readiness of the evacuation infrastructure and the reception facilities in the areas outside the alert zone that would receive displaced residents in the event of a full evacuation. The Prime [clears throat] Minister's statement issued within hours of the alert level upgrade was carefully constructed to convey the seriousness with which the government was treating the situation without producing the kind of catastrophizing language that would have amplified the public fear beyond what the current state of the scientific assessment warranted.

[00:23:38]The statement described the situation as concerning, described the monitoring as intensive and the scientific assessment as ongoing, and described the emergency management system as ready while recommending that the population of the alert zone familiarize themselves with the evacuation routes and be prepared to follow official guidance promptly if an evacuation order was issued. The mayor of Naples, whose city and whose constituents were directly involved in the situation, provided a more immediate and more personal communication, appearing at a press conference in the hours after the earthquake to speak directly to the fear that was visible on the roads and in the social media of the city.

[00:24:12]The mayor acknowledged the fear explicitly, described it as understandable given the situation, and made the specific distinction between appropriate preparedness and premature panic that the emergency management communication needed to convey. The message that leaving the city without an official evacuation order was not only unnecessary but potentially counterproductive because it created the congestion that would complicate an actual evacuation if one became necessary was one that the mayor communicated with the personal authority of someone speaking to their own community. The coordination between the national and local authorities and the communication between the scientific community and the civil protection system was functioning in the current emergency in the way that the years of developing and refining the Campi Flegrei emergency plans had intended.

[00:24:55]The communication was not perfect and the public information environment was more chaotic than the official channels could fully manage, but the essential elements of the emergency response, the scientific assessment being conducted rigorously and communicated to the authorities, the alert level reflecting the current state of the evidence, the emergency management activities being activated proportionately and the public being given accurate information as quickly as it could be prepared were all operating. The hours since the earthquake have produced additional data from the monitoring network that the scientific team is incorporating into a continuously updated assessment. The seismicity in the caldera following the magnitude 4.4 event has continued at an elevated rate compared to the pre-earthquake background with multiple aftershocks in the magnitude 2 to 3 range that are spatially consistent with the same fault zone that produced the main shock.

[00:25:41]The ground deformation monitoring has not shown a dramatic change in the uplift rate in the immediate post-earthquake period, which could reflect either that the stress released in the earthquake was a local adjustment in the shallow crust rather than a response to a major change in the deep pressure source or that the temporal resolution of the deformation monitoring is insufficient to detect a change on the time scale of hours. The fumarolic emission monitoring at Solfatara has shown a temporary increase in the emission rate and temperature in the period following the earthquake, a change that the volcanologists are interpreting as a response to the seismic stress change, the earthquake having altered the permeability of the hydrothermal system in a way that has briefly increased the flow rate of the hot fluids to the surface. This kind of co-seismic change in fumarolic activity is well documented at Campi Flegrei and at other hydrothermal volcanoes around the world and its occurrence following the earthquake is not in itself a signal of a significant change in the underlying volcanic state, but its monitoring will provide additional information about the current state of the hydrothermal system as the fumarolic changes evolve over the coming days. The seismic wave field in the broad region surrounding the caldera has been examined for any signals of magma movement. The specific low frequency and very long period seismic signals that are generated by the movement of fluids in volcanic conduits and that would indicate that the earthquake was associated with a significant change in the magmatic plumbing rather than being purely a response to the hydrothermal pressurization.

[00:27:03]No clear signals of this type have been identified in the immediate post-earthquake data which is one of the pieces of information that is most directly relevant to the question of whether the earthquake represents a step toward an eruption or a stress adjustment in the shallow hydrothermal system. The volcanologist who was on the phone when the earthquake struck has been in the monitoring center for most of the time since the earthquake occurred. She will continue to be there reviewing the data as it arrives contributing to the ongoing assessment and being available for the communication to the authorities and the public that the situation requires.

[00:27:33]This is what the monitoring center was built for and the people who staff it have prepared for this situation through years of training and simulation and the constant daily engagement with the data that gives them the expertise to conduct the assessment in real time. She is not certain what the caldera is going to do.

[00:27:49]No one is.

[00:27:50]The history of Campi Flegrei is a history of unrest episodes that have resolved without eruption and the base rate of that outcome is high. It is also a history that includes eruptions the most recent of which created Monte Nuovo in 1538 in a process that began with the same kinds of ground deformation and seismicity that the monitoring is currently recording.

[00:28:10]The 1538 eruption was preceded by approximately two years of elevated unrest that the historical accounts describe with the specific detail of people living through something that was becoming increasingly difficult to attribute to the manageable variations they had come to expect from the burning fields beneath their homes. The Italian country is not in the 1538 situation.

[00:28:29]The monitoring capability that exists today did not exist in 1538. The understanding of the volcanic system is vastly greater. The emergency management infrastructure is vastly more developed.

[00:28:39]The communication between the scientific community and the civil protection authorities is functioning. The population has been educated about the hazard and the appropriate responses to specific alert levels. These differences are real and they matter. What has not changed between 1538 and today is the caldera itself. It sits there beneath the homes and the streets and the ancient ruins and the modern port of Pozzuoli, beneath the soccer fields and the schools and the hospitals of the communities built above it, accumulating and releasing and accumulating again the geological energy that has been doing this for 39,000 years and that will continue doing it for geological time to come.

[00:29:15]The earthquake that struck it was 4.4 on a scale that ends at 10. The caldera has produced worse. The question, as it has always been for the people who live above it and the scientists who watch it and the government that is responsible for the safety of both, is not whether it will produce worse again but when and whether the warning, when it comes, will be clear enough and early enough and communicated well enough to get everyone out in time. The monitoring continues.

[00:29:39]The caldera is being watched as carefully as the current capability allows. The data is being processed and assessed and communicated. And in the communities of the Phlegraean Fields, the people who have lived their whole lives above a supervolcano are doing what they have always done in the interval between the moments when the ground reminds them what lies beneath.

[00:29:57]They are going home. They are watching the news. They are listening for the official guidance that will tell them whether to stay or to go. And they are carrying, as they have always carried, the specific knowledge that the burning fields are not a metaphor and that the ground they walk on is thinner than it appears. The earthquake has passed. The monitoring goes on. The caldera is still there.