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2009 L'Aquila earthquake

Coordinates: 42°20′51″N 13°22′48″E / 42.3476°N 13.3800°E / 42.3476; 13.3800
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2009 L'Aquila earthquake
The local prefecture (a government office) damaged by the earthquake
2009 L'Aquila earthquake is located in Abruzzo
2009 L'Aquila earthquake
2009 L'Aquila earthquake is located in Italy
2009 L'Aquila earthquake
UTC time2009-04-06 01:32:42
ISC event13438018
USGS-ANSSComCat
Local date6 April 2009 (2009-04-06)
Local time03:32 CEST[1]
MagnitudeMw6.3 (GCMT)[2]
Depth9.46 km (5.88 mi)[1]
Epicenter42°20′51″N 13°22′48″E / 42.3476°N 13.3800°E / 42.3476; 13.3800[1]
Areas affectedAbruzzo, Italy
Total damage$16 billion[3]
Max. intensityMMI X (Extreme)[4]
Peak acceleration0.66 g[5]
Peak velocity42.83 cm/s[5]
Casualties308 dead[6]
1,500+ injured[7]
66,000+ homeless[8]

An earthquake occurred in the region of Abruzzo, in central Italy, at 03:32 CEST (01:32 UTC) on 6 April 2009. It was rated 5.8 or 5.9 on the Richter magnitude scale and 6.3 on the moment magnitude scale;[9] its epicentre was near L'Aquila, the capital of Abruzzo, which together with surrounding villages suffered the most damage. There were several thousand foreshocks and aftershocks since December 2008, more than thirty of which had a Richter magnitude greater than 3.5.[9]

The earthquake was felt throughout central Italy; 308 people are known to have died,[6] making this the deadliest earthquake to hit Italy since the 1980 Irpinia earthquake. In a subsequent inquiry of the handling of the disaster, seven members of the Italian National Commission for the Forecast and Prevention of Major Risks were accused of giving "inexact, incomplete and contradictory" information about the danger of the tremors prior to the main quake.[10][11] On 22 October 2012, six scientists and one ex-government official were convicted of multiple manslaughter for downplaying the likelihood of a major earthquake six days before it took place. They were each sentenced to six years' imprisonment,[10][11][12] but the verdict was overturned on 10 November 2014.[13] Criticism was also applied to poor building standards that led to the failure of many modern buildings in a known earthquake zone: an official at Italy's Civil Protection Agency, Franco Barberi, said that "in California, an earthquake like this one would not have killed a single person".[14] in April 2022 the reconstruction was at 72% in L'Aquila city and in the region hit by the 2009 earthquake.[15]

Cause

This earthquake was caused by movement on a NW-SE trending normal fault according to moment tensor solutions.[16] Although Italy lies in a tectonically complex region, the central part of the Apennines has been characterised by extensional tectonics since the Pliocene epoch (i.e. about the last 5 million years), with most of the active faults being normal in type and NW-SE trending.[17] The extension is due to the back-arc basin in the Tyrrhenian Sea opening faster than the African Plate is colliding with the Eurasian Plate.[16]

The earthquake occurred at 03:32 CEST (01:32 UTC) at the relatively shallow depth of 9.46 kilometres (5.88 mi) and with an epicentre at 42.3476° N, 13.3800 °E,[1] approximately 90 kilometres (60 mi) north-east of Rome, near the city of L'Aquila.[18] The earthquake was reported to measure 6.3 on the moment magnitude scale.[16]

Historical context

Earthquakes mark the history of L'Aquila, a city built on the bed of an ancient lake, providing a soil structure that amplifies seismic waves. The city was struck by earthquakes in 1315, 1349, 1452, 1501, 1646, 1703, 1706 and 1958.[19] The earthquake of February 1703, which caused devastation across much of central Italy, largely destroyed the city and killed around 5,000 people.[20] In addition, a 1915 earthquake that killed more than 30,000 people and obliterated almost every building in Avezzano and several villages around it happened within 35 kilometres (22 mi) from L'Aquila.

Effects

Nationality Deaths Injured
 Italy 288 1,173
 North Macedonia 5[21]
 Romania 5[22]
 Czech Republic 2[23]
 Ukraine 2[24][25]
 Greece 1[26] 5
 France 1[27]
 Israel 1[28]
 Argentina 1[29]
 Peru 1[30]
 Moldova 1[31]
Total 308[32] about 1,500

The earthquake caused damage to between 3,000 and 11,000 buildings in the medieval city of L'Aquila.[33] Several buildings also collapsed. A total of 308 people died in the earthquake,[6] including five Macedonians,[34] five Romanians,[22] two Ukrainians,[24][25] two Czechs,[23] a Greek,[26] a Moldovan,[35] a Peruvian,[30] an Argentinian,[29] a French,[27] and an Israeli, and approximately 1,500 people were injured. Twenty of the victims were children.[36] Around 66,000 people were rendered homeless.[8]

The main earthquake was preceded by two smaller earthquakes the previous day.[33] The earthquake was felt as far away as Rome (92 kilometres (57 mi) away), in other parts of Lazio, as well as Marche, Molise, Umbria and Campania. Schools remained closed in the Abruzzo region. Most of the inhabitants of L'Aquila abandoned their homes and the city itself; in the city centre of L'Aquila, and the nearby village of Paganica which was also badly damaged, many streets were impassable due to fallen masonry. The hospital at L'Aquila, where many of the victims were brought, suffered damage in the 4.8 aftershock which followed the main earthquake an hour later. Powerful aftershocks, some only slightly weaker than the main shock, were felt throughout the following 2 days.

Villages in the valley along Strada Statale 17 just outside l'Aquila suffered the greatest damage while medieval mountain hill towns lying high above the valley suffered little damage. Onna was reported to be mostly leveled with 38 deaths among the 350 residents.[37] The villages of Villa Sant'Angelo and San Pio delle Camere were badly damaged.[38] Fatalities were reported in Poggio Picenze, Tornimparte, Fossa, Totani, San Gregorio and San Pio delle Camere.[39]

Many of L'Aquila's medieval buildings were damaged. The apse of the Basilica of Saint Bernardino of Siena, L'Aquila's largest Renaissance church, was seriously damaged, and its campanile collapsed. Almost the whole dome of the 18th-century church of Anime Sante in Piazza Duomo fell down. The 13th-century Basilica di Santa Maria di Collemaggio collapsed from the transept to the back of the church, and Porta Napoli, the oldest gate to the city, was destroyed. The third floor of Forte Spagnolo, the 16th-century castle housing the National Museum of Abruzzo, collapsed, as did the cupola of the 18th-century Baroque church of St Augustine, damaging L'Aquila's state archives. This church had been rebuilt after it was destroyed in the 1703 earthquake.[40] The Cathedral of L'Aquila has lost part of its transept and maybe more with the effects of the aftershocks. Slight damage was also reported to the Baths of Caracalla in Rome, but other Roman monuments such as the Colosseum and Roman Forum were unharmed.[41]

The damaged Santa Maria Church in the town of Paganica

While most of l'Aquila's medieval structures suffered damage, many of its modern buildings suffered the greatest damage, for instance, a dormitory at the university of l'Aquila collapsed. Even some buildings that were believed to be "earthquake-proof" were damaged. L'Aquila Hospital's new wing, which opened in 2000 and was thought capable of resisting almost any earthquake, suffered extensive damage and had to be closed.

Homeless camps

Around 40,000 people who were made homeless by the earthquake found accommodation in tented camps[8] and a further 10,000 were housed in hotels on the coast.[42] Others sought shelter with friends and relatives throughout Italy. Prime Minister Silvio Berlusconi caused a controversy when he said, in an interview to the German station n-tv, that the homeless victims should consider themselves to be on a "camping weekend" – "They have everything they need, they have medical care, hot food... Of course, their current lodgings are a bit temporary. But they should see it like a weekend of camping."[43] To clarify his thought, he also told the people in a homeless camp: "Head to the beach. It's Easter. Take a break. We're paying for it, you'll be well looked after."[44] The billionaire prime minister claimed he will offer his own house to some of the survivors.[45]

Building standards

Poor building standards or construction materials seem to have further contributed to the large number of victims. According to firefighters and other rescuers, some concrete elements of the fallen buildings "seemed to have been made poorly, possibly with sand".[46] An official at Italy's Civil Protection Agency, Franco Barberi, said that "in California, an earthquake like this one would not have killed a single person".[14] According to Italian media, L'Aquila's chief prosecutor has opened a probe into possible criminal blame for the collapses.[47]

Luminous phenomena

Many people reported seeing peculiar sightings of light glows, flashes, lightning, flames and fireballs, all of which were considered candidates for earthquake light.[48][49] 241 luminous phenomena were collected including photos and videos. At least 99 of such phenomena occurred before the main shock and other strong events of the seismic sequence, whereas globular lights, luminous clouds and diffused light were more frequent before the quakes. Flashes were mostly observed during the main shock. Electrical discharges and flames were observed principally after the main shock. Many luminous events were observed before and after the main shock without the ground shaking and were very similar to those reported about two centuries ago. An earthquake alarm system has been proposed, based on a video sensing network to capture earthquake light and provide a warning if observations match threshold characteristics preceding a main shock.[50]

Aftershocks

Magnitude of L'Aquila earthquake and aftershocks

The epicentral region saw dozens of significant aftershocks following the main earthquake. The strongest, which hit at 19:47 CEST on 7 April, measured magnitude 5.3 ML  and caused further damage.[51] According to the Italian National Geophysics Institute director Boschi, the aftershock epicentres migrated south-east, thus lessening the risk of further major shocks near populated areas.

Aftershocks caused safety problems for rescue crews searching for injured victims trapped in precarious structures in the historic center of L'Aquila, a medieval city. Using cranes and backhoes to remove loose bricks and broken timbers, the crews were aware that even a small aftershock could have triggered the collapse of seriously damaged walls or parapets.

The aftershocks also caused sustained psychological trauma to small children and elderly who had already been traumatized by the main earthquake of 6 April 2009. Aware of this, the Italian government temporarily relocated thousands of citizens away from the epicentral area.

As a result of aftershocks, the dome of the Anime Sante Basilica in L'Aquila, already heavily damaged by the main shock, almost entirely collapsed. Further buildings collapsed in L'Aquila and in neighbouring municipalities. The largest aftershock was strong enough to be felt in Rome, where it caused an elderly man to die of cardiac arrest.[52]

List of foreshocks and aftershocks

Only shocks with local magnitude 4.0 or higher are listed. There have been dozens of small magnitude aftershocks, ML  1–3, but these generally do not cause further structural damage. Shocks with local magnitude 5.0 or higher are highlighted in blue, and the main shock is highlighted in darker blue.[53]

Date (YYYY-MM-DD)
and time (UTC)		 Time
(local)		 Lat. Long. Depth ML
2009-03-30 13:38:39 15:38:39 42.321° N 13.376° E 9.8 km (6.1 mi) 4.1
2009-04-06 01:32:39 03:32:39 42.334° N 13.334° E 8.8 km (5.5 mi) 6.3
2009-04-06 01:36:29 03:36:29 42.355° N 13.342° E 9.7 km (6.0 mi) 4.7
2009-04-06 01:40:51 03:40:51 42.418° N 13.408° E 11.0 km (6.8 mi) 4.1
2009-04-06 01:41:33 03:41:33 42.387° N 13.316° E 9.1 km (5.7 mi) 4.3
2009-04-06 01:42:50 03:42:50 42.300° N 13.429° E 10.5 km (6.5 mi) 4.2
2009-04-06 02:37:04 04:37:04 42.366° N 13.340° E 10.1 km (6.3 mi) 4.6
2009-04-06 16:38:09 18:38:09 42.362° N 13.333° E 10.2 km (6.3 mi) 4.0
2009-04-06 23:15:37 01:15:37 42.451° N 13.364° E 8.6 km (5.3 mi) 4.8
2009-04-07 09:26:28 11:26:28 42.342° N 13.388° E 10.2 km (6.3 mi) 4.7
2009-04-07 17:47:37 19:47:37 42.275° N 13.464° E 15.1 km (9.4 mi) 5.3
2009-04-07 21:34:29 23:34:29 42.380° N 13.376° E 7.4 km (4.6 mi) 4.2
2009-04-08 22:56:50 00:56:50 42.507° N 13.364° E 10.2 km (6.3 mi) 4.3
2009-04-09 00:52:59 02:52:59 42.484° N 13.343° E 15.4 km (9.6 mi) 5.1
2009-04-09 03:14:52 05:14:52 42.338° N 13.437° E 18.0 km (11.2 mi) 4.2
2009-04-09 04:32:44 06:32:44 42.445° N 13.420° E 8.1 km (5.0 mi) 4.0
2009-04-09 19:38:16 21:38:16 42.501° N 13.356° E 17.2 km (10.7 mi) 4.9
2009-04-13 21:14:24 23:14:24 42.504° N 13.363° E 7.5 km (4.7 mi) 4.9
2009-04-14 20:17:27 22:17:27 42.530° N 13.288° E 10.4 km (6.5 mi) 4.1
2009-04-23 15:14:08 17:14:08 42.247° N 13.492° E 9.9 km (6.2 mi) 4.0
2009-04-23 21:49:00 23:49:00 42.233° N 13.479° E 9.3 km (5.8 mi) 4.0
2009-06-22 20:58:40 22:58:40 42.446° N 13.356° E 14.2 km (8.8 mi) 4.5
2009-07-03 11:03:07 13:03:07 42.409° N 13.387° E 8.8 km (5.5 mi) 4.1
2009-07-12 08:38:51 10:38:51 42.338° N 13.378° E 10.8 km (6.7 mi) 4.0
2009-09-24 16:14:57 18:14:57 42.453° N 13.330° E 9.7 km (6.0 mi) 4.1

Emergency and reconstruction aid

National aid

Emergency personnel review damaged buildings

Many Italian companies have offered some sort of help. All Italian mobile companies (Telecom Italia Mobile,[54] Vodafone Italy,[55] Wind,[citation needed] H3G[citation needed]), and some Mobile virtual network operators,[56] sent free minutes and credit to all their pre-paid customers in Abruzzo, suspended billing to all post-paid customers and extended their coverage with additional mobile base stations to cover homeless camps. In addition, some companies sent free mobile phones, SIM Cards and chargers for those who lost their mobiles, and set up a national unique number to send donations to, by placing a call or sending an SMS. Poste Italiane sent to homeless camps some mobile units acting as Postal Office, to allow people to withdraw money from their accounts as well as their retirement.[57] Many companies, such as pay-tv SKY Italia, suspended billing to all customers in Abruzzo, and offered some decoders to homeless camps to allow them to follow the funerals and the news.[58] Ferrovie dello Stato offered railway sleeping carriages to host some homeless people, and offered free tickets to all people and students living in Abruzzo. AISCAT (Associazione Italiana Società Concessionarie Autostrade e Trafori) declared that all toll-roads in Abruzzo would be free of charge.[59] All tax billing for all Abruzzo residents has been suspended by the government, as well as mortgage payments.

International aid

Prime Minister of Italy Silvio Berlusconi refused foreign aid for the emergency, saying that Italians were "proud people" and had sufficient resources to deal with the crisis.[37] However he singled out the United States, announcing that he would accept aid for reconstruction: "If the United States wants to give a tangible sign of its solidarity with Italy, it could take on the responsibility of rebuilding heritage sites and churches. We would be very happy to have this support." and suggested the US help rebuild "a small district of a town or a suburb".[60] Aid was offered by[61] Austria, Brazil, Croatia, the European Union, France, Germany, Spain, Greece, Slovakia, Israel, Portugal,[62] Iran,[63] North Macedonia,[64] Mexico,[65] Russia, Serbia,[66] Slovenia,[67] Switzerland,[68] Tunisia, the Turkish Red Crescent,[69] Ukraine,[70] and the United States.[71] Aid was also offered by various organisations, companies, sport clubs and celebrities including ACF Fiorentina,[72] Carla Bruni,[73] Madonna,[74] S.S.C. Napoli,[75] Zastava[76] and Fiat.[77]

On 20 November 2009 in Brussels, Pawel Samecki and Guido Bertolaso who, at that time, were European Commissioner for Regional Policy and commander in chief of the Italian Civil Protection department respectively, signed an agreement to provide 493.7 million euros from EU solidarity fund to help reconstruction in Abruzzo.[78]

Prior warning

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Italian laboratory technician Giampaolo Giuliani claimed to have predicted[79] a major earthquake on Italian television a month before,[80][81][82] after measuring increased levels of radon emitted from the ground. He was accused of being alarmist[82] by the Director of the Civil Defence, Guido Bertolaso, and forced to remove his findings from the Internet (old data and descriptions are still online).[83] He was also reported to police a week before the main quake for "causing fear" among the local population when the mayor of Sulmona claimed that Giuliani predicted an imminent earthquake in his town,[84] about 50 km (31 mi) from L'Aquila, on 30 March, after a 4° quake happened (Sulmona later only suffered minor damages from 6 April earthquake).[85] Enzo Boschi, the head of the Italian National Geophysics Institute declared:

Every time there is an earthquake there are people who claim to have predicted it. As far as I know nobody predicted this earthquake with precision. It is not possible to predict earthquakes.[86]

Scientists have studied Earthquake predictions based on radon emissions since the 1970s, but enthusiasm for the method has faded due to inconsistent results.[87]

Controversy on reconstruction and criminality

In the days following the tragedy, journalists reported that the reconstruction works may have been infiltrated by criminal organizations, with the Mafia and Camorra trying to infiltrate the contract procedures.

On 7 April, a few hours after the main earthquake, journalist Luca Spinelli stated:[88]

The transfers of money necessitated by such a big tragedy are huge: much the same as the cost of running a war. [...] Any company would be interested in a turnover and a potential income like this. Surely the "main Italian company" will be: a company with a ninety billion annual income, making up to 7% of Italian GDP (Gross Domestic Product): the Mafia. [...] Abruzzo and Marsica are known territories of the mafia. A region which "attracted the attention of some Camorra and Sacra Corona Unita associates too", according to Franco Forgione, President of the Parliamentary Antimafia Commission in 2007. A region which, according to the Antimafia District Public Prosecutor's Office of L'Aquila, hosts part of the hidden treasure of mafia boss Vito Ciancimino, reckoned to be around 600 million euros, a region which has seen many recent arrests for mafia infiltration; infiltration in contracts, building permits, the health system, the very things that will be needed for the reconstruction.

The week following the earthquake, on 14 April, journalist and writer Roberto Saviano, author of the bestseller Gomorrah, wrote:[89]

Data demonstrates that the Camorra invasion (in Abruzzo) during these years was enormous. In 2006 it emerged that the ambush against mafia boss Vitale was decided and settled in detail at Villa Rosa in Martinsicuro. On 10 September, Diego León Montoya Sánchez, the drug dealer deemed among the ten most wanted by the FBI, had one of his bases in Abruzzo. Nicola di Villano, cashier in a criminal-entrepreneurial organisation led by the Zagaria family of Casapesenna, repeatedly managed to escape capture and it was discovered that his shelter was located in the Abruzzo National Park, where he had the ability to move freely. Abruzzo has become a junction point for waste traffic. [...] Behind it all, obviously, the Camorra clans.

In the following weeks, even major Italian institutions talked about the danger of criminal infiltration, noting that these risks would have been avoided with adequate supervision and inspections. On 15 April, President of the Chamber of Deputies Gianfranco Fini confirmed the need to "watch out for mafia infiltrations".[90]

On 17 April, Italian Prime Minister Silvio Berlusconi, stated: "Exploitation will be impossible, we will reconstruct within 6 months keeping out exploitation and the mafia."[91]

State funeral

Cardinal Tarcisio Bertone presides over the state funeral ceremony

On the morning of 10 April 2009, which was also Good Friday, a state funeral was held for 205 of the 291 victims of the earthquake. It was attended by Prime Minister Silvio Berlusconi, President of the Republic Giorgio Napolitano, and many other politicians and church dignitaries.[92] The funeral Mass was led by the Vatican's second highest official, Cardinal Tarcisio Bertone. The Vatican had earlier granted a special dispensation to hold a Mass on Good Friday, the only day on the Roman Catholic calendar on which Mass is not normally held.[93] Near the end, an Islamic rite was held for the Muslim victims. In addition Friday was declared a national day of mourning, with flags flying at half staff, shops lowering their shutters and flights stopping at the airport for one minute of silence.[94]

Pope Benedict XVI later visited the areas affected by the L'Aquila earthquake on 28 April 2009.[95]

G8 summit

The 35th G8 summit took place in the city of L'Aquila, Abruzzo, on 8–10 July 2009. It was moved from the Sardinian seaside city of La Maddalena as part of an attempt to redistribute disaster funds after the earthquake.[96]

Prosecutions

A trial, which lasted from September 2011 until October 2012, found six scientists and a former government official guilty of involuntary manslaughter.[97] According to the prosecution, they had spread "inaccurate, incomplete and contradictory" statements after preliminary tremors could be felt on the days before 6 April 2009. While scientists were found guilty for failing to give adequate warning,[98] the full text of the decision said that "science [was] not being tried for failing to predict the April 6, 2009 earthquake" ("Non è sottoposta a giudizio la scienza per non-essere riuscita a prevedere il terremoto del 6 aprile 2009").[99] The seven members of the National Commission for the Forecast and Prevention of Major Risks who were convicted were: Franco Barberi, head of Serious Risks Commission; Enzo Boschi, former president of the National Institute of Geophysics and Volcanology; Giulio Lorenzo Selvaggi, director of National Earthquake Centre; Gian Michele Calvi, director of European Centre for Earthquake Engineering; Claudio Eva, physicist; Mauro Dolce, director of the Civil Protection Agency's earthquake risk office; Bernardo De Bernardinis, former vice-president of Civil Protection Agency's technical department.[10]

Boschi had called a major earthquake "unlikely", while not entirely excluding the possibility. De Bernardinis had informed the public that there was "no danger".[11] The prosecutors cited a scientific opinion that the low-level tremors ahead of 6 April quake were typical of the seismic activity preceding major convulsions, but the defendants had classified them as a "normal geological phenomenon".[12] They were criticised in court for being "falsely reassuring" and Judge Marco Billi gave them a six-year jail sentence on 22 October 2012,[10] reasoning that they had provided "an assessment of the risks that was incomplete, inept, unsuitable, and criminally mistaken".[99][100] They were also banned from ever holding public office again and had to pay court costs and damages.

Enzo Boschi, one of the convicted, said, "I thought I would have been acquitted. I still don't understand what I was convicted of."[10] His co-defendant Claudio Eva said that "it was a very Italian and medieval decision."[101] Their lawyers announced they would appeal the verdict, and it will not be finally decided until it is heard by the appellate court.

The verdicts were strongly criticised by the British media and public.[10] The journal Nature ran an editorial stating that the "verdict is perverse and the sentence ludicrous."[102] Malcolm Sperrin, a British scientist, said:

If the scientific community is to be penalised for making predictions that turn out to be incorrect, or for not accurately predicting an event that subsequently occurs, then scientific endeavour will be restricted to certainties only, and the benefits that are associated with findings, from medicine to physics, will be stalled.[10]

This position was countered by other views. David Ropeik, writing for Scientific American, contested the "trial against science" thesis, describing it as "a judgment not against science, but against a failure of science communication".[103]

During the trial, other scientists attacked the scientific conduct of the commission. Professor Francesco Giovanni Maria Stoppa, a member of the commission until 2003, said: "They should have given information proportional to our knowledge, which in 2009 spotlighted a criticality in L'Aquila. Under those conditions, there were 5–6 days before the quake to give information, and this doesn't mean forecasting earthquakes."[104]

In protest over the prison sentences handed to his seven colleagues, Luciano Maiani, the head of Italy's disaster body, resigned.[105]

In November 2014, the scientists' convictions were quashed by an appeals court, except for Bernardo De Bernardinis, whose sentence was reduced.[106][107] The result of this appeal was definitively confirmed by the Italian Supreme Court, Corte di Cassazione, on 20 November 2015.[108][109][110]

See also

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Notes

  1. ^ a b c d Istituto Nazionale Geofisica e Vulcanologia (INGV). Location of April 6, 2009 earthquake updated with all the available data Archived 19 May 2009 at the Wayback Machine. Retrieved 24 August 2009. 7 September 2009.
  2. ^ International Seismological Centre. ISC-EHB Bulletin. Thatcham, United Kingdom. [Event 13438018].
  3. ^ "Italy Quake Reconstruction to Cost at Least $16 Billion". Fox News. 15 April 2009. Archived from the original on 19 April 2009. Retrieved 23 October 2012.
  4. ^ Gabriele Ameri; Dino Bindi; Francesca Pacor; Fabrizio Galadini (2011). "The 2009 April 6, Mw 6.3, L'Aquila (central Italy) earthquake: finite-fault effects on intensity data". Geophysical Journal International. 186 (2): 837–851. Bibcode:2011GeoJI.186..837A. doi:10.1111/j.1365-246X.2011.05069.x.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  5. ^ a b "Table 3 Peak ground acceleration (PGA), Velocity (PGV) and Displacement".
  6. ^ a b c Alexander D.E. (2010). "The L'Aquila Earthquake of 6 April 2009 and Italian Government Policy on Disaster Response". Journal of Natural Resources Policy Research. 2 (4): 325–342. doi:10.1080/19390459.2010.511450. S2CID 153641723.
  7. ^ "Abruzzo in ginocchio, i morti sono 272 Ancora scosse. Venerdì i funerali di Stato". Corriere della Sera (in Italian). Milan. 8 April 2009. Archived from the original on 7 July 2009.
  8. ^ a b c Hooper, John (28 April 2009). "Pope visits Italian village hit hardest by earthquake". The Guardian. London. Archived from the original on 1 May 2009. Retrieved 19 May 2009.
  9. ^ a b Istituto Nazionale Geofisica e Vulcanologia (INGV). The L'Aquila seismic sequence – April 2009. Accessed 24 August 2009. Archived 7 September 2009.
  10. ^ a b c d e f g Johnston, Alan (2012). "BBC News – L'Aquila quake: Italy scientists guilty of manslaughter". bbc.co.uk. Retrieved 22 October 2012.
  11. ^ a b c Pappas, Stephanie (2012). "Italian Scientists Get 6 Years for Earthquake Statements | LiveScience". livescience.com. Retrieved 22 October 2012.
  12. ^ a b Sisto, Alberto (22 October 2012). "Italian scientists convicted over earthquake warning". Reuters. London. Archived from the original on 23 October 2012. Retrieved 22 October 2012. Alt URL
  13. ^ "L'Aquila quake: Scientists see convictions overturned". BBC News. Retrieved 10 November 2014.
  14. ^ a b Aloisi, Silvia (7 April 2009). "Italy quake exposes poor building standards". Reuters. Archived from the original on 16 April 2009. Retrieved 17 April 2009.
  15. ^ L'Aquila earthquake's data & 2 maps of 2022 reconstruction (in Italian)
  16. ^ a b c USGS. "M6.3 – central Italy". United States Geological Survey.
  17. ^ Akinci, A.; Galadini, F.; Pantosti, D.; Petersen, M.; Malagnini, L.; Perkins, D. (6 April 2009). "Effect of Time Dependence on Probabilistic Seismic-Hazard Maps and Deaggregation for the Central Apennines, Italy". The Bulletin of the Seismological Society of America. 99 (2A): 585. Bibcode:2009BuSSA..99..585A. doi:10.1785/0120080053. Archived from the original on 10 April 2009. Retrieved 6 April 2009.
  18. ^ Lewis, Paul (6 April 2009). "Background: Italy and earthquakes". The Guardian. London.
  19. ^ "L'Aquila, prov. of L'Aquila, Abruzzo". Abruzzo2000.com. Archived from the original on 7 January 2009. Retrieved 6 April 2009.
  20. ^ Buffon, Georges Louis Leclerc (1792). Buffon's Natural History. Vol. 2. London: J.S. Barr. OCLC 316760617.
  21. ^ "Хакик Бајрами шестиот македонски граѓанин кој загина во Италија" (in Macedonian). A1 TV. 9 April 2009. Archived from the original on 11 April 2009.|
  22. ^ a b "Cinci români, printre victimele cutremurului din Italia" (in Romanian). Realitatea TV. 8 April 2009. Retrieved 7 April 2009.
  23. ^ a b "Quake: Over 100 dead, 1,500 injured". ANSA. 6 April 2009. Archived from the original on 9 April 2009. Retrieved 6 April 2009.
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