[H-DS08] 地すべりおよび関連現象

[HDS08-13] 2023年トルコ・シリア地震時に発生した斜面災害について

*王 功輝¹、ゴルム トルガ²、タンヤス ハカン³、馬 寧⁴ (1.京都大学防災研究所、2.イスタンブール工科大学固体地球科学科、3.トゥエンテ大学　国際地理情報科学と地球観測研究所、4.西南交通大学地球科学と環境工程学院)

キーワード：2023年トルコ・シリア地震、斜面災害、地震動、移動機構、余震観測、せん断挙動

On February 6, 2023, two major earthquakes measuring Mw 7.8 and Mw 7.5 occurred in Kahramanmaraş within 9 hours. The earthquakes impacted 11 cities in Turkey, covering an area of approximately 90,000 km², and resulted in nearly 60,000 casualties, tens of thousands injured, and more than 450,000 buildings damaged or collapsed. During the earthquakes, more than 3600 landslides had also been trigged with most of them being concentrated in the northern half of the impacted area. Field survey revealed that although most of the landslides are rock falls in small scale, bedrock rotational landslides, translational slides and lateral spreads had also been triggered in huge number. In some areas, slope instability had been initiated with the occurrence of ground cracks widely distributed on the upper slopes of some giant landslides. To better understand the initiation and movement mechanisms of these landslides, we installed seismometers on different locations of the two large-scale landslides, and obtained more than 100 aftershocks. Through analyzing these seismic recordings, we examined the possible seismic response of the slopes during the main shocks. We also took soils samples from some landslides and examined their shear behaviors under different loading conditions, and then analyzed the possible initiation and movement mechanisms of these landslides. Some preliminary results will be reported in this study.