UTC time | 1933-04-23 05:57:34 |
---|---|
ISC event | 905533 |
USGS-ANSS | ComCat |
Local date | 23 April 1933 |
Magnitude | 6.4 Mw |
Depth | 15 km (9.3 mi) |
Epicenter | 36°45′32″N27°17′56″E / 36.759°N 27.299°E |
Areas affected | Greece, Turkey |
Max. intensity | MMI X (Extreme) |
Tsunami | None |
Casualties | 181+ fatalities |
The 1933 Kos earthquake struck the Aegean Sea region on 23 April. It measured Mw 6.4 and had an epicenter offshore, near Kos, Greece. The earthquake collapsed many buildings on Kos, Nisyros and other islands. At least 181 people were killed with a possible death toll reaching several hundred.
The eastern Mediterranean Sea is a region of dynamic plate interactions involving the Eurasian and Aftican plates—dominated by the North Anatolian Fault and Hellenic subduction zone. The Aegean Sea is a seismically active and complex area in the eastern Mediterranean Sea that experiences frequent large earthquakes and tsunamis. The Aegean Sea plate formed between the divergent boundary in Greece, separating it from the Eurasian plate; and the subduction zone in the south separating it from the African plate. [1] The east Aegean Sea is a region of extensional tectonics; around Kos, this tectonic setting formed the Kos and Gökova grabens, Quaternary submarine structures trending northeast–southwest and east–west, respectively. Earthquakes in the area are associated with normal faults that accommodates extension. Earthquakes in 1493, 1869 and 2017 caused severe damage and casualties. [2]
Prior to 1933, Kos was damaged by an intermediate-depth (115 km (71 mi)) Ms 7.4 earthquake. The April 1933 earthquake had magnitudes between 6.43 and 6.70; the International Seismological Centre cataloged it at Mw 6.4. [3] The Modified Mercalli intensity on Kos ranged from VIII (Severe) to X (Extreme). Intensity IX–X (Violent–Extreme) was observed at Antimachia, Kardamaina and Kos. On Nissyros, the seismic intensity was VI–VII (Strong–Very strong). On Rhodes, the earthquake was felt V–VI (Moderate–Strong). [4]
In Kos historic city center, 90 percent of homes were demolished and only some government buildings were intact. Only 50 percent of homes were decimated in the new city. The Church of Agios Nikolaos was badly damaged and has to be torn down. At Pyli, a village west of the city, there was heavy damage. Almost all homes in Antimakheia were destroyed, and the village of Kardamena was near completely ruined. On Nissyros, the villages of Emporio, Pali, Mandraki and Nikia were damaged. Slight damage also occurred at Bodrum, Turkey. [4]
The death toll ranged from 181 to several hundreds. Various press reports estimated 200–300 deaths on Kos. Only 122 victims were named. In Kos city, the death toll was reexamined to 178. Three more deaths occurred at Pyli. The number of injured was 600 to several thousand. Various press reports also stated between 20 and 100 deaths or no deaths on Nissyros. [4]
The island population and mass media continues to suppose a 2–3 m (6 ft 7 in – 9 ft 10 in) tsunami struck the island but no reports exist. A newspaper reported ebb tide at Kos port for several tens of meters although it is unclear when did it occur. No coastal uplift associated with the earthquake was documented. Reports of waves likely were due to strong wind rather a tsunami associated with the earthquake. [4]
The 1938 Banda Sea earthquake occurred on February 2 at 04:04 local time with an estimated magnitude of 8.5-8.6 on the moment magnitude scale. Shaking was intense with an assigned Rossi–Forel intensity of VII and intensity of VI (Strong) on the Modified Mercalli intensity scale. This oblique-slip event generated a destructive tsunami of up to 1.5 metres in the Banda Sea region, but there were no deaths.
The 1999 Athens earthquake occurred on September 7 at 14:56:51 local time near Mount Parnitha in Greece with a moment magnitude of 6.0 and a maximum Mercalli intensity of IX (Violent). The proximity to the Athens metropolitan area resulted in widespread structural damage, mainly to the nearby suburban towns of Ano Liosia, Acharnes, Fyli, Thrakomakedones, Kifissia, Metamorfosi, Kamatero and Nea Filadelfeia. More than 100 buildings across those areas collapsed trapping scores of victims under their rubble while dozens more were severely damaged. With damage estimated at $3–4.2 billion, 143 people were killed, and up to 1,600 were treated for injuries in Greece's deadliest natural disaster in almost half a century.
The 1918 Shantou earthquake occurred in Shantou, Guangdong, Republic of China. Serious damage and high casualty numbers were reported in Guangdong and the surrounding provinces. It also caused some damage in British Hong Kong.
The 1303 Crete earthquake occurred at about dawn on 8 August. It had an estimated magnitude of about 8, a maximum intensity of IX (Violent) on the Mercalli intensity scale, and triggered a major tsunami that caused severe damage and loss of life on Crete and at Alexandria. It badly damaged the Lighthouse of Alexandria.
The 1932 Ierissos earthquake occurred at 19:20 on 26 September. It caused severe damage in Ierissos, Greece and the surrounding part of the Chalkidiki peninsula, with 161–491 casualties reported.
The 1941 Andaman Islands earthquake struck the Andaman Islands on June 26 with a magnitude of 7.7 to 8.1. Details of this event are poorly known as much of Southeast Asia was in the turmoil of World War II. The quake caused severe damage in the Andaman Islands. The tsunami it triggered was reported along the Andaman and Nicobar Islands, India and British Ceylon. There may have been damage and deaths in Bangladesh, Myanmar, and Thailand due to the tsunami.
The 1956 Amorgos earthquake occurred at 03:11 UTC on July 9. It had a magnitude of 7.7 on the moment magnitude scale and a maximum perceived intensity of IX on the Mercalli intensity scale. The epicentre was to the south of the island of Amorgos, the easternmost island of the Cyclades in the Aegean Sea. There was significant damage on Amorgos and the neighbouring island of Santorini. It was the largest earthquake in Greece in the 20th century. It was followed 13 minutes later by a magnitude 7.2 earthquake near Santorini. It triggered a major tsunami with a maximum run-up of 30 m. The combined effects of the earthquake shaking and the tsunami caused the deaths of 53 people with a further 100 injured.
The 1999 Ambrym earthquake occurred on November 27 at 00:21:17 local time with a moment magnitude of 7.4 and a maximum Mercalli intensity of VII. The back arc thrust event occurred within the Vanuatu archipelago, just to the south of the volcanic island of Ambrym. Vanuatu, which was previously known as New Hebrides, is subject to volcanic and earthquake activity because it lies on an active and destructive plate boundary called the New Hebrides Subduction Zone. While the National Geophysical Data Center classified the total damage as moderate, a destructive local tsunami did result in some deaths, with at least five killed and up to 100 injured.
The 2004 Les Saintes earthquake occurred at 07:41:07 local time on November 21, 2004 with a moment magnitude of 6.3 and maximum European macroseismic intensity of VIII. The shock was named for Îles des Saintes "Island of the Saints", a group of small islands to the south of Guadeloupe, which is an overseas department of France. Although it occurred near the Lesser Antilles subduction zone, this was an intraplate, normal fault event. It resulted in one death, 13 injuries, and 40 people being made homeless, but the overall damage was considered moderate. A small, nondestructive tsunami was reported, but run-up and inundation distances were difficult to measure due to a storm that occurred on the day of the event. Unusual effects at a volcanic lake on Dominica were also documented, and an aftershock caused additional damage three months later.
On 21 July 2017, a large earthquake measuring 6.6 on the moment magnitude scale struck right near Bodrum, a popular town of tourism in Turkey, killing 2 and injuring hundreds. Mostly referenced as the 2017 Bodrum–Kos earthquake, this earthquake generated a tsunami which was one of the largest tsunamis in the Mediterranean Sea region.
The 1963 Marj earthquake occurred on February 21 in northern Libya. The earthquake occurred at 18:14:36 local time with a moment magnitude of 5.6 and a maximum Mercalli intensity of VIII (Severe). Financial losses totaled US$5 million, with 290–375 deaths, 375–500 injuries, and 12,000 people being rendered homeless.
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An earthquake with a moment magnitude of 7.0 occurred on 30 October 2020 about 14 km (8.7 mi) northeast of the Greek island of Samos. Although Samos was closest to the epicentre, it was the Turkish city İzmir, 70 km (43 mi) northeast that was heavily affected—more than 700 residential and commercial structures were seriously damaged or destroyed. One hundred and seventeen people died in İzmir Province while an additional 1,034 were injured. In Greece, there were two fatalities and 19 injured. The earthquake is the deadliest in the year 2020, and the third major earthquake to strike Turkey that year. The event is called the Samos earthquake by the International Seismological Centre.
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