Why did Turkey have two major earthquakes of magnitude 7.5 or above in one day?

Turkey has two major earthquakes of magnitude 7.5 or above in one day, because Turkey is located at the junction of Africa plate, Asia-Europe plate and Arabia plate, in the seismic active zone, and is one of the most active countries in the world. Generally speaking, in the seismic active zone, the probability of earthquake swarm type earthquake will be great.

According to the China Seismological Network, an earthquake of magnitude 7.8 occurred in southern Turkey at 9: 00 17 on February 6th, Beijing time. Then on the same day 18: 24, an earthquake of magnitude 7.8 occurred again. What Turkey encountered this time was a rare "earthquake swarm earthquake", which was extremely destructive. Group earthquakes refer to earthquake sequences with two or more main earthquakes. The two earthquakes of magnitude 7.8 that occurred in Turkey in one day belong to the earthquake swarm type. Two major earthquakes of magnitude 7.5 or above occurred in Turkey in one day. In addition to two extremely strong earthquakes in a short time, there were 24 aftershocks around the epicenter.

Turkey is located at the intersection of Arabian plate, Eurasian plate and African plate. Turkey has two border fault zones, North Anatolia fault zone and East Anatolia fault zone. Under the interaction of plates, the crust near these two fault zones collides violently, which usually causes strong earthquakes and aftershocks between regions.

The earthquake in Turkey caused a large number of buildings to collapse in the earthquake, some of which were even razed to the ground and thousands of people were homeless. The second strong earthquake made the rescue work even worse.

Two large earthquakes of magnitude 7.5 or above occurred in Turkey in one day, which were mainly affected by the fault zone and seismic zone where it was located. First, two large earthquakes of magnitude 7.5 or above occurred in Turkey in one day, which are directly related to the faults in which they are located. Turkey is located in the Anatolian fault zone, between the African plate and the Eurasian plate, and runs through Turkey from east to west. At the same time, due to the pressure from the Arabian plate, the Eurasian plate in the fault zone is slowly moving eastward, which leads to extremely unstable crust and great probability of earthquake swarm.

Secondly, two large earthquakes of magnitude 7.5 or above occurred in Turkey in one day, which are also closely related to the earthquake zone where it is located. At present, the world's earthquakes are mainly distributed in three zones, namely, the Pacific Rim seismic zone, which is located at the junction of the Pacific plate and surrounding plates; The Mediterranean-Himalayan seismic belt is located in the collision zone between the Eurasian plate and the African plate and the Indian Ocean plate. The mid-ocean ridge seismic belt is located on the extension boundary of the plate. Turkey is located in the Mediterranean-Himalayan seismic belt, which is the main seismic belt in the world. It used to be the most active earthquake zone in the world. In addition, in recent years, this area has been continuously affected by plate compression and collision, resulting in frequent earthquake swarms. Therefore, it is not surprising that two major earthquakes of magnitude 7.5 or above occurred in Turkey in one day.

China is located between two major earthquake zones in the world, namely, the Pacific Rim seismic zone and the Eurasian seismic zone. Due to the compression of the Pacific plate, the Indian plate and the Philippine Sea plate, the earthquake rupture is obvious. After an earthquake, aftershocks will occur not only within a day, but also several years later. First, after the 6.25-magnitude earthquake in Luanxian County, Hebei Province, the aftershocks lasted for half a year until. Second, in 1974, an earthquake of magnitude 7. 1 occurred in Zhaotong, Yunnan Province, and there were still two aftershocks of magnitude 5 or above after the earthquake. Thirdly, 1976, after the Tangshan earthquake of magnitude 7.8 in Hebei Province, two strong aftershocks occurred, with magnitudes of magnitude 6.5 and 7. 1 respectively; Fourthly, in 2020, an earthquake of magnitude 5. 1 occurred in guye district, Tangshan, Hebei, with a focal depth of 10 km, which was the aftershock of the Tangshan 1976 earthquake. This is indeed the connection between earthquakes and aftershocks.

As the saying goes, you should plan ahead. At present, earthquakes cannot be accurately predicted, so it is particularly important to do a good job in daily earthquake prevention and disaster reduction education. After the earthquake, it will cause great damage to buildings, and when it collapses, it will cause great casualties, reminding people to re-understand the building structure, building risk avoidance ability and seismic grade of building projects. After the earthquake, 72 hours is the prime time for rescue, so it is particularly important and urgent to further improve the rescue capacity and the construction of rescue teams.