2023年2月6日土耳其M7.8级地震地表破裂带初步调查

Preliminary Investigation on the Surface Ruptures of the Turkey M7.8 Earthquake on February 6, 2023

2023年2月6日,土耳其发生两次M7.8级地震,在Hatay省形成地表破裂带。通过对Hatay省Karatas和Hassa地区地表破裂带的初步野外调查,发现断破裂带走向为N5°E至N20°E,延伸长度大于40km,性质为左旋逆冲,最大同震位错的逆冲量为50~60 cm,走滑量为2m左右。此次地震始于Narlı断裂,并向东安纳托利亚断裂带南北双向传播,从而使得研究区断裂走滑位错自北向南有减小的趋势,并逐渐尖灭消失。

Two M7.8 earthquakes struck southern and central Turkey on February 6,2023,forming typical surface ruptures in Hatay Province.Earthquake surface raptures geometry and displacement characteristics were investigated in Karatas and Hassa regions.Preliminary results show that the rupture with strike of N5°E–N20°E extends over 40 km.Left-lateral strike-slip faulting developed with an average horizontal displacement of 50–60 cm and maximum horizontal displacement of 2 m.The earthquake development started on NarlıFault,transferred to the main fault and propagated to south and north across the main fault of East Anatolian Fault Zone,which lead to the decreasing of the horizontal coseismic displacement in research area.