Seismic and geologic controls on spatial clustering of landslides in three large earthquakes

摘要: Abstract. The large, shallow earthquakes at Northridge, California (1994), Chi-Chi, Taiwan (1999), and Wenchuan, China (2008), each triggered thousands of landslides. We have determined the position of these landslides along hillslopes, normalizing for statistical bias. landslide patterns a co-seismic signature, with clustering ridge crests slope toes. A cross-check against rainfall-induced inventories seems to confirm that crest is specific seismic triggering as observed in previous studies. In our three study areas, ground motion parameters lithologic topographic features used do not seem exert a primary control on clustering. However, we show that scale epicentral area, toe clustering occur in areas geological features. Toe of seismically induced tends occur along regional major faults. Crest concentrated sites where lithology along hillslopes approximately uniform, or made alternating soft hard strata, without strong overprint structures. Although earthquake-induced locate higher hillslopes a statistically significant way, strongly modulate landslide position hillslopes. As result observation landslide clustering ridges cannot be definite indicator of the amplification shaking.