Rainfall events triggering shallow landslides

In Austria shallow landslides are usually triggered by prolonged, intense rainfalls. The Figure below shows a comparison of the number of landslides mapped in the respective orthophoto series for the Laternser valley (Vorarlberg, Austria) with the two-day precipitation sum of the station Innterlaterns in the centre of the valley. At least for the landslides mapped in the orthophoto series of 2001 and 2005 it is known that they were triggered in May 1999 and August 2005 respectively during extreme rainfall events exceeding 250 mm/2d.
landslides_rainfall
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