Preliminary Insights into the Hazards Triggered by the 2023 Jishishan Ms 6.2 Earthquake in Gansu Province
On 2023 December 18,an Ms 6.2(Mw 5.9)seismic event struck Jishishan County,Gansu Province,with a focal depth of 10 km.This earthquake caused a large number of casualties,house collapses,and geohazards.To obtain a preliminary understanding of earthquake-induced hazards,this study discussed some characteristics of the hazards triggered by this event based on existing literature,high resolution remote sensing data,and field investigation data.The results showed this earthquake was a thrust event,where the seismogenic fault was attributed to the north Laji Mt.fault.The strong seismic shaking caused by the shallow earthquake coupled with site amplification of loose surficial layers caused the meizoseismal area to experience extreme seismic shaking,causing numerous house collapses.While fewer landslides occurred in hanging wall areas(e.g.,the Jishishan mountain area),only Guanting Basin,which is covered by loess,was found to be a landslide-prone area due to the hundreds of small landslides and a seismic liquefied earthflow that occurred in this basin.
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