M L 7.3 M W 7.6
11/11/20152 Chi-Chi epicenter Landslides
Jiufengershan landslide
Geological context
11/11/20156 Geological Section 1.5 km × 40~60m Elevation difference: ~ 500m Dip angle: 20°
11/11/2015 Jiufenershan landslide 7 Litho-Stratigraphy ageStratumLithologyT (m) Plio.Kueichulin (KC)Calcareous SS.?? M Mio. H Changhukeng (CHt)Sdy. St. and Sh.180 M Changhukeng (CHm)Muddy SS.90 L Changhukeng (CHb)glauconite Sh.80 M Mio. H Shihmen (SMt)Massive SS.165 M Shihmen (SMm)Thick muddy SS.110 L Shihmen (SMb)Interbedded145 E Mio.Tanliaoti (TL)Thick Sh.??
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10 Monocline ?
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11/11/ Cut-and-fill volume Cut: 42.1 x 10 6 m 3 Fill: 50.5 x 10 6 m 3
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11/11/ Tsaoling landslide
11/11/ Time Triggered by Landslide process Slide volume (km 3 ) Dam height (m) Effects 1862 Earthquake (M L =6-7) Landslide formation of a dam 1898Rainfall (?)Landslide dam broke 1941 Earthquake (M L =7.1) persons killed and formation of a dam 1942Rainfall (776mm) persons killed and increased landslide dam 1951Rainfall (770mm) persons killed and broke landslide dam 1979 Rainfall (327mm) Landslide formation of a dam Rainfall (624mm)0.040Landslide dam broke 1999 Earthquake (M L =7.3) persons killed and formation of a dam Historical events in Tsaoling
Geological map
11/11/ Stratigraphic column and profile
DTMs
11/11/ Geological profile Sliding area
11/11/ Cut-and-fill volume 1999 vs.2003
11/11/ Cut-and-fill volume 2003 vs.2007
11/11/ Retreat of the scarp main scarp 730m
11/11/ Retreat of the scarp 155m minor scarp
11/11/ Retreat of the scarp 38m lateral scarp
11/11/ Retreat of the scarp m upstream
11/11/ Retreat of the scarp 240m downstream
11/11/ B E D A C
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