Landslides Triggered by the 3 August 2014 Ludian (China) M w 6.2 Earthquake: An Updated Inventory and Analysis of Their
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Land dslides Trigger T red by the t 3 Au ugust 20014 Lud dian (China) Mw 6.2 6 Eartthquakee: An Updated U d Inventtory and d Analy ysis of Th heir Spaatial Disstributiion 1 Weiying Wu1, Chon ng Xu *2, 3, Xiaoqing Wang W , Yingying Tian3, Feei Deng1
1. Institute of Earthquake Forecasting, China C Earthquake Administratiion, Beijing 1000036, China 2. Instituute of Crustal Dynamics, D Chinna Earthquake Administration, A , Beijing 1000885, China 3. Key Laborratory of Active Tectonics and Volcano, Institute of Geology,, China Earthquuake Administrration, Beijing 100029, 1 China C Chong Xu: httpss://orcid.org/000 00-0002-3956-44925 ABSTRACT: The A T 3 August 2014 Ludian, Yunnan, Chin na Mw 6.2 (M Ms 6.5) earthqu uake triggered a large number of o coseismic laandslides. Baseed on pre- and d post-quake hiigh-resolution optical satellitte images, this stu udy established a new, comp plete and objecctive databasee of these landsslides with fielld investigations. The updated inventory i show ws that this earrthquake trigggered at least 12 817 landslidees w a total occcupation area of 16.33 km2, covering a nearly circular area with a about 6000 km2, which all a e exceed those in n our previouss work and oth her relevant studies. In addittion, we used tthis database to t e examine the coorrelations of the landslidess with topogra aphic, geologic, and seismic factors. Resullts s show that the landslides l occu urred mostly at places with slope s gradientss 10º–40º, show wing an increasse t tendency with steeper slopess. Affected by the propagatio on direction off the earthquaake rupture, th he e eastward-facin ng slopes are more m prone to landsliding. l Th he differences between the laandslide suscep pt tibility in diffferent strata indicate i that lithology is also a an imporrtant controlliing factor. Th he landslide densiity of the placees with peak ground accelera ation (PGA) greater than 0.116g is obviouslly larger than thoose with PGA less l than 0.16gg. Meanwhile, the greater the distance from m the epicenteer, t lower the susceptibility the s o landslides iss. This study suggests of s that when w using sattellite images to t c create coseismiic landslide in nventories, it should meet ceertain conditions, including h high resolution n, w whole coveragee, and timely data d collection n. The correct criteria of cosseismic landslid de inventoryin ng a also should bee followed. Such inventoriess can provide a reliable baasis for hazard d assessment of o ggered landslides and other quantitative sttudies. e earthquake-tri K KEY WORDS: 2014 Ludian n earthquake, coseismic c land dslides, landslid de inventory, sspatial distribu ut tion. 0
INTRODU UCTION Major eaarthquakes in mountainous m areeas can induce massive landslidess, leading to serious disasters (Shao et al., 20019a; Tian et al., 20019a; Lei, 2012; Xu et al., 20110; Yin et al., 2009; 2 Keefer, 1984; Seed, 1968). A detailed andd accurate invenntory of earthquakee-triggered landdslides is an important i basis for research on thhis issue (Ma annd Xu, 20
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