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Locating, monitoring, and characterizing typhoon-linduced landslides with real-time seismic signals |
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| Authors: | Honn Kao Chih-Wen Kan Rong-Yuh Chen Chien-Hsin Chang Andreas Rosenberger Tzay-Chyn Shin Pei-Ling Leu Kai-Wen Kuo Wen-Tzong Liang |
| Institution: | 1. Geological Survey of Canada, Pacific Geoscience Centre, 9860 West Saanich Road, Sideny, BC V8L 4B2, Canada 2. Central Weather Bureau, 64, Gongyuan Road, Taipei, 10048, Taiwan 3. Institute of Earth Sciences, Academia Sinica, 128, Sec. 2, Academia Road, Nangang, Taipei 11529, Taiwan |
| Abstract: | Landslides induced by typhoon Morakot during its passage across Taiwan on 7–9 Aug 2009 claimed more than 700 lives and caused heavy economic loss. Unlike earthquake monitoring, precise locations of landslides could not be determined in near-real time because their seismic phases are difficult to identify. Here, we show that large, damaging landslide events are characterized seismically by a distinct waveform pattern of frequent intermixes of P and S waves over a time window of several tens of seconds. The predominant frequency band during these time windows ranges from 0.5 to 5?Hz. The high-frequency content is clearly deficient relative to that of local earthquakes by about one to two orders. We also demonstrate that large landslide events can be located and monitored with algorithms specifically designed for real-time seismic applications. This near-real-time monitoring capability would be particularly useful for emergency responders and government organizations to coordinate effective relief-and-rescue operations. |
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