Seismic risk in Malta is considered to be low with little historic damage noted and no known victims. The archipelago is however in a potentially significant seismic zone and the risk to the population is probably undervalued.
The Maltese Archipelago rests on an underwater plateau, a relatively stable part of the African Plate. The islands are situated around 200 km to the south of the subduction fault between the African Plate and the Eurasian Plate. The pelagic plate forms a shallow platform separating the Ionian basin from the Western Mediterranean Basin, situated roughly under the Strait of Sicily. The plate is crossed by a rift zone formed of three grabens: the Pantelleria graben, that of Malta, and that of Linosa. These grabens are linked by a system of north–south orientation faults (sometimes west–east) with dextral cavities that are responsible for most of the earthquakes that can affect the archipelago. [1]
The islands themselves are made up of limestone rocks from the Oligocene and Miocene geological epochs, belonging to the Cenozoic era.
Prior to the 20th century and the first seismic recordings in the region, information on Maltese earthquakes was researched in archives. These range mostly from the arrival of the knights of the Order of St John of Jerusalem in 1530 to the British colonisation of Malta. After this period, the localisation of the epicentres of earthquakes in the Sicilian Channel has been relatively limited, mostly due to an inadequate network of seismic stations, particularly before 1980.
Year | Date | Localisation of the epicentre | Coordinates | Maximum intensity in Malta | Earthquake intensity | Earthquake magnitude (Mw) |
---|---|---|---|---|---|---|
1542 | 10 December at around 15:15 [2] | East of Sicily | 37°12′N14°54′E / 37.20°N 14.90°E | 7 | 10 | 6.6 |
1562 | 8 March, morning | 5 ? | ||||
1636 | 1 September | 5 ? | ||||
1693 | 11 January, around 13:30 | East of Sicily | 37°11′N15°01′E / 37.18°N 15.02°E | 7–8 | 9 | 7.4 |
1743 | 20 February, around 16:30 | Ionian Sea | 39°52′N18°47′E / 39.87°N 18.78°E | 7 | 9 | 6.9 |
1789 | 19 January, morning | Sicilian Channel ? | 5 ? | |||
1793 | 26 February, morning | Sicilian Channel ? | 5 ? | |||
1848 | 11 January, around midday | East of Sicily | 37°12′N15°12′E / 37.2°N 15.2°E | 5 | 8–9 | 5.5 |
1856 | 12 October, around 00:45 | Crete | 37°12′N15°12′E / 37.2°N 15.2°E | 7 | 7.7 | |
1856 | 8 February, around 23:45 | Sicilian Channel ? | 5 ? | |||
1886 | 15 August, around 02:45 | Sicilian Channel ? | 5 ? | |||
1886 | 27 August, around 22:00 | Aegean Sea ? | 36°24′N27°12′E / 36.4°N 27.2°E ? | 6–7 | 11 | 7.3 |
1911 | 30 September, around 09:25 | Sicilian Channel ? | 36°24′N13°30′E / 36.4°N 13.5°E ? | 7 | ||
1923 | 18 September, at 07:30 | Sicilian Channel ? | 35°30′N14°30′E / 35.5°N 14.5°E ? | 6 | ||
1926 | 26 June at 19:46 | Aegean Sea | 36°30′N27°30′E / 36.5°N 27.5°E ? | 5 | 7.6 | |
1972 | 21 March at 23:06 | Sicilian Channel | 35°48′N15°00′E / 35.8°N 15°E ? | 5 | 4.5 | |
2022 | 22 November | Sicilian Channel | 4.6 | |||
2023 | 22 April at 12.20am [3] | 35.026°N 15.219°E | 5.3 |
The Sicilian Chronicle of the 16th century reports that the earthquake of 10 December 1542 was strongly felt in Malta where some houses were knocked down.
The earthquake of 11 January 1693 in Val di Noto is the most significant earthquake felt in Malta since the 16th century. In Sicily, it caused the death of around 60,000 individuals. With a magnitude of 7.4, it is considered to be the most powerful earthquakes in Italian history. [2] The earthquake was preceded on 9 January by a precursory earthquake of a magnitude of around 5.9 which was strongly felt but did not cause damage.
In Malta, the earthquake provoked panic among the population, with many Maltese refusing to go back to their homes in the nights that followed, seeking refuge in tents or underground shelters. No injuries or fatalities were reported. The Order delegated its head engineer, Mederico Blondel to assess the damage. At Valletta, no building escaped unharmed by the earthquake, from simple cracks to complete demolition. The other towns of the Grand Harbour were considerably less affected. However, the old city of Mdina suffered more greatly as many of the buildings were older and were poorly maintained. Notably, St. Paul's Cathedral was part destroyed – but the cathedral was already badly damaged before the earthquake, and so a reconstruction had already been planned. The Banca Giuratale in Mdina was equally damaged, and would be rebuilt in 1726 by Charles François de Mondion. At Rabat, the bell tower and the apse of the church of St. Paul came down. The Tal-Virtù Church suffered considerable damage, it was situated at a high altitude which was particularly susceptible to earthquakes. [4]
At Gozo, the walls of the Cittadella were damaged, but Blondel notes that the damage were more likely caused by years of neglect. The Cathedral of the Assumption, Gozo lost its bell tower. [1]
The considerable material damage in Malta has been attributed to the maximum earthquake intensity of 7–8.
Local historian Gian Pietro Francesco Agius de Soldanis recounts 20 February 1743 earthquake in his magnum opus Il Gozo Antico-Moderno e Sacro-Profano, a two-volume manuscript dealing with the history of Gozo completed in 1746: [5]
...At 5 pm, a violent earthquake shook the Maltese isles. It lasted for seven minutes. It left great damage on the two isles. At Gozo, the church of Saint George, Saint James and the chapel of Notre-Dame at Qala were greatly damaged. In Malta, the church of St John at Valletta, the cathedral of Mdina and many other churches were also effected. At Wardija, near Qala, people are said to have seen the earth rise and fall with such force that the soil seemed to remain floating in the air, creating a dust cloud that remained for a long time. Many of the hills in Gozo crumbled.
A document in the archives of the cathedral of Mdina described how the coppolino (the little dome) of the cathedral fell into the church, the back end of the choir was destroyed and the bell tower heavily damaged. The cathedral was so cracked in all areas that:
...Even the sound of the bell didn't dare to enter for fear of seeing the building fall.
An account by six architects described three large cracks of around 3 cm in width on each side of the cupola, revealing most of the stones in the cupola and the terrible damage to the walls of the choir. [1]
The epicentre situated near Crete was very seriously hit by the particularly violent earthquake of 12 October 1856. Certain seismic registers attribute it with a magnitude of 8.2. It claimed numerous victims in Crete. Despite being at a distance of more than 1000 km from the epicentre, the earthquake was violently felt in Malta, as the newspapers of the era testify. People were woken in the middle of the night by a deafening growl and a movement of the earth that lasted between 22 and 60 seconds. Nearly all the houses in Valletta were damaged, as were houses in Gozo, notably on the upper floors. Numerous churches were affected, and in particular the cathedral of Mdina. The belltower of the church of the Carmelites at Mdina was so cracked that it needed to be rebuilt. The chapel on the islet of Filfla was destroyed. [1] The 17th-century Għajn Ħadid Tower collapsed in this earthquake and has remained in ruins ever since. [6]
This was probably the earthquake on the same day that struck the SW Peloponnese. Once again, the local papers reported a general panic in the population that rushed outside dwellings, awoken by the earthquake on 27 August 1886. Some buildings were affected, including the ceiling of the Palace of Justice in Valletta. For once, the cathedral in Mdina was not greatly affected. [1]
30 September 1911 earthquake was more distinctly felt in Gozo than in Malta. Newspapers reported the appearance of deep cracks in the domes and the belltowers of many churches, in particular at Nadur, Għarb, and Ir-Rabat, Gozo, where many public buildings were affected. Numerous rural buildings were completely destroyed. Fort Chambray was badly hit. Many landslides were reported on the isle of Gozo. In Malta, damage was limited to a few cracks. [1]
18 September 1923 earthquake was the first to follow the installation of a Milne seismograph at Valletta. It seems not to have worked and gave no useful information; the seismologic data is therefore not clear. The shock seems to have been most felt around the Grand Harbour. Some damage was reported, such as the falling of the stone crosses on churches or cracks in the domes. The greatest ravages seem to have been those exerted on the church of St Paul in Rabat, Malta. The Tal-Virtù Church was badly damaged and remained unused for more than 70 years. [1]
The tsunami of 16 January 1693 occurred contemporaneously with the strong earthquake. Agius de Soldanis recounts how the sea at Xlendi turned a thousand times before returning with force. [7]
The tsunami of 28 December 1908 corresponds to the earthquake in the Strait of Messina. [2] At least three large waves caused significant damage and took a number of victims in the east of Sicily. The waves of this tsunami hit the shores of Malta an hour later, causing flooding at Msida, where part of the old town was damaged. At Marsaxlokk a foaming wave crossed the main road hitting the church of St. Peter. At Sliema, the sea came and went with force. The sea level was registered as abnormally high in the Grand Harbour. Many fishing boats were damaged or destroyed, but no deaths were reported. [7]
Seismic risk was evaluated at an event of intensity 8 happening every 1000 years and an event at intensity 6 happening every 92 years. Historically, since 1530, an earthquake of 7–8 intensity has been reported, as well as at least four events of intensity 7. [1]
The risk of a tsunami wave between 4 m and 7 m high is estimated as a possibility every 600 to 1500 years. The occurrence of an event comparable to that of 1603, could have grave social and economic consequences as areas near the sea are largely built up, in particular for tourist activity in the region of Sliema. [7]
Despite a proposed bill, no seismic building standards have been imposed as the rate of construction accelerates and numerous buildings are completed. The risk is increased further by building in unreinforced masonry, incorporating heavy floors and concrete roofs with often large cellars used as garages. This type of construction is particularly sensitive to earthquakes. [1]
Victoria, also known among the native Maltese as Rabat or by its title Città Victoria, is an administrative unit of Malta, and the main town on Gozo. Victoria has a total population of 6,901, and is the most populous settlement in Gozo.
The 2001 southern Peru earthquake occurred at 20:33:15 UTC on June 23 with a moment magnitude of 8.4 and a maximum Mercalli intensity of XII (Extreme). The quake affected the Peruvian regions of Arequipa, Moquegua and Tacna. It was the most devastating earthquake in Peru since the catastrophic 1970 Ancash earthquake and globally the largest earthquake since the 1965 Rat Islands earthquake.
Maltese architecture has its origins in prehistory, and some of the oldest free-standing structures on Earth – a series of megalithic temples – can be found on Malta. The islands were colonized by the Phoenicians and later the Romans, who established the cities of Melite and Gaulos. Although these were substantial settlements and are known to have had numerous temples, churches and palaces, few remains have survived apart from some architectural fragments.
This page list topics related to Malta.
The Metropolitan Cathedral of Saint Paul, commonly known as St Paul's Cathedral or the Mdina Cathedral, is a Catholic cathedral in Mdina, Malta, dedicated to St. Paul the Apostle. The cathedral was founded in the 12th century, and according to tradition it stands on the site where Roman governor Publius met St. Paul following his shipwreck on Malta. The original cathedral was severely damaged in the 1693 Sicily earthquake, so it was dismantled and rebuilt in the Baroque style to a design of the Maltese architect Lorenzo Gafà between 1696 and 1705. The cathedral is regarded as Gafà's masterpiece.
Lorenzo Gafà (1639–1703) was a Maltese Baroque architect and sculptor. He designed many churches in the Maltese Islands, including St. Paul's Cathedral in Mdina and the Cathedral of the Assumption in Victoria, Gozo. He was the younger brother of the sculptor Melchiorre Cafà.
The 1693 Sicily earthquake struck parts of southern Italy near Sicily, then a territory part of the Crown of Aragon by the Kings of Spain Calabria, and Malta on 11 January at around 21:00 local time. This earthquake was preceded by a damaging foreshock on 9 January. The main quake had an estimated magnitude of 7.4 on the moment magnitude scale, the most powerful in Italian recorded history, and a maximum intensity of XI (Extreme) on the Mercalli intensity scale, destroying at least 70 towns and cities, seriously affecting an area of 5,600 square kilometres (2,200 sq mi) and causing the death of about 60,000 people.
The Cathedral of the Assumption of the Blessed Virgin Mary into Heaven is a Roman Catholic cathedral in the Cittadella of Victoria in Gozo, Malta. The cathedral is dedicated to the Assumption of Mary, and has been the seat of the Roman Catholic Diocese of Gozo since the formation of the diocese in 1864.
Canon Giovanni Pietro Francesco Agius de Soldanis, often called de Soldanis, was a Maltese linguist, historian and cleric from the island of Gozo. He wrote the first lexicon and systematic grammar of the Maltese language, and he was the first librarian of the Bibliotheca Publica, the precursor of the National Library of Malta.
The 1382 Dover Straits earthquake occurred at 15:00 on 21 May. It had an estimated magnitude of 6.0 Ms and a maximum felt intensity of VII–VIII on the Mercalli intensity scale. Based on contemporary reports of damage, the epicentre is thought to have been in the Strait of Dover. The earthquake caused widespread damage in south-eastern England and in the Low Countries. The earthquake interrupted a synod in London that convened in part to examine the religious writings of John Wycliffe, which became known as the Earthquake Synod.
The 1907 Sumatra earthquake occurred on January 4 at 05:19:12 UTC. The re-estimated moment magnitude (Mw) is 8.2 to 8.4, with an epicentre close to Simeulue, off Sumatra. An earlier study re-estimated a surface-wave magnitude (Ms) of 7.5 to 8.0. It triggered a widespread and damaging Indian Ocean wide tsunami that caused at least 2,188 deaths on Sumatra. The low observed intensity compared to the size of the tsunami has led to its interpretation as a tsunami earthquake. Higher levels of shaking observed on Nias are attributed to a large aftershock, less than an hour later. The tsunami gave rise to the S'mong legend, which is credited with saving many lives during the 2004 earthquake.
The 1912 Maymyo earthquake or Burma earthquake struck Burma on the morning of May 23, with an epicentre near Taunggyi and Pyin Oo Lwin in Shan State. The earthquake was initially calculated at 8.0 on the surface wave magnitude scale (Ms ) by Beno Gutenberg and Charles Francis Richter, and described by them as being one of the most remarkable seismic events in the early 1900s. Recent re-evaluation of the earthquake, however, have revised the magnitude to 7.6–7.9. It was preceded by two foreshocks on May 18 and 21 with respective intensities V and VII on the Rossi–Forel scale, while the mainshock was assigned IX. Shaking was felt throughout most of Burma, parts of Siam and Yunnan; an area covering approximately 375,000 square miles. It was one of the largest earthquakes in the country.
The 1856 Heraklion earthquake, also known as the Crete earthquake or Rhodes earthquake, occurred on the morning of October 12 at 02:45 am local time. This extremely catastrophic earthquake had an estimated magnitude of 7.7 to 8.3 at a depth of approximately 61 to 100 km. The earthquake was felt over a very wide area extending from Sicily, Italy to the Levant and North Africa. On the Greek island of Crete, the effects of the earthquake were cataclysmic, over 500 bodies were recovered in the city of Heraklion. Shockwaves from the earthquake were felt intensely, covering all of the Ottoman Empire; present-day Turkey, Cyprus and the Middle East where damage and human losses were reported. In Malta, the Għajn Ħadid Tower—a coastal watchtower built around the year 1638—was severely damaged in the earthquake, when its upper floor collapsed. In Cairo, Egypt, the earthquake destroyed buildings, created seiches in canals, and killed several people. Off the Egyptian and Italian coasts, sailors reported feeling a seaquake.
The 1626 Lingqiu earthquake had an epicentre in Lingqiu County, Shanxi Province during the Ming dynasty. The estimated surface wave magnitude (Ms ) 7.0 earthquake caused many buildings to collapse. Over 5,200 people were killed.
The 1743 Salento earthquake affected the Apulian region of southwestern Italy on 20 February at 23:30 IST. The ~7.1 Mw earthquake had an epicenter in the Adriatic and Ionian seas, off the coast of modern-day Lecce and Brindisi provinces in Salento. It had a maximum Modified Mercalli intensity of IX (Violent), causing heavy damage in Nardò. Damage was also reported across the sea, in the Balkans. The earthquake also generated a tsunami of up to 11 meters in run-up. Between 180 and 300 people were killed in the disaster.
The 1804 Almería earthquake was a highly destructive seismic event in the Province of Almería, southern Spain. It occurred on 25 August at 8:25 pm local time. The mainshock had a maximum intensity assigned VIII–IX on the European macroseismic scale (EMS), and an estimated moment magnitude of 6.2–6.4 Mw . At least 400 people were reported killed.
The 1882 Panama earthquake occurred on September 7 at around 03:50 (UTC-5). The earthquake measured a magnitude between 7.9 and 8.3 on the surface-wave magnitude scale, making it the largest earthquake recorded in Panamanian history. It struck the San Blas Islands and was strongly felt in the City of Colón as well as the capital of Panama City. The earthquake also produced a major tsunami that had a maximum run-up of 3 meters. In total, the earthquake killed 250 people, 75 of which were from the tsunami. The earthquake and tsunami also halted the construction of the Panama Canal by a few months.
Anton Agius (1933-2008) was a Maltese sculptor, best known for creating a large number of monuments around Malta. He was dubbed "the national sculptor" by former Maltese president Ugo Mifsud Bonnici.
On 19 September 2022, a moment magnitude 7.6-7.7 earthquake struck between the Mexican states of Michoacán and Colima at 13:05:06 local time. The earthquake had a depth of 26.9 km (16.7 mi), resulting in a maximum intensity of VIII (Severe) on the Modified Mercalli intensity scale. The USGS reported the epicentre was 35 km (22 mi) southwest of the town of Aquila. Two people were killed and at least 35 others were injured across several states. A magnitude 6.8 aftershock struck on 22 September, causing three more deaths.