CENTRAL GEOLOGICAL SURVEY, MOEA

	Basic Studies
	Hydrogeology
	Data Management
	Geology of Metropolis
	Debris Flow
	Landslides
	Slopelands
	Active Fault
	Earthquake Geology
	Engineering Geology
	Geohazards
	Gas Hydrate

:::Investigation On Landslides And Geological Hazard Evaluation

A. Investigation on Landslides Triggered by Earthquakes, Kuohsin Area	B. Investigation on Earthquake Landslides in The Puli Area

B. Investigation on Earthquake Landslides in The Puli Area

Within the Puli map sheet area there are 875 sites of landslides, the total larea of landslide is 787 hectares. Landslides developed in the Changshuhu Shale cover an area of 242 hectares, thus is the most extensive in this map sheet area. The main site is the dipslope slide that occurred at Chiufengershan. The Paileng Formation is close second with 400 landslides, with slide area only slightly smaller. However the Paileng Formation is the overall rock formation with the most landslides in one stratigraphic entity. This is because the Paileng is a quartzite formation, being hard and brittle, and is readily shattered due to load relief in stream valleys, thus is densely cut by numerous joints, such rock formation contributes huge quantity of rock falls and debris to landslide following earthquake shaking, it thus stands to reason that the number of landslides developed in this type of rock is higher. From the relationship between number of landslides, area coverage, and gradient, it can be seen that most landslides are located between 20-40 degrees.

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