GEOSCAN Search Results: Fastlink


TitleLocating, monitoring, and characterizing typhoon-induced landslides with real-time seismic signals
AuthorKao, H; Kan, C -W; Chen, R -Y; Chang, C -H; Rosenberger, A; Shin, T -C; Leu, P -L; Kuo, K -W; Liang, W -T
SourceLandslides 2012 p. 1-7,
Alt SeriesEarth Sciences Sector, Contribution Series 20110361
Mediaon-line; digital
File formatpdf
Subjectsengineering geology; mathematical and computational geology; geophysics; landslides; mudflows; landslide deposits; debris flow deposits; statistical methods; statistics; slope deposits; slope failures; slope stability; seismicity; seismographs
Illustrationsgraphs; plots; seismograms
ProgramTargeted Hazard Assessments in Western Canada, Public Safety Geoscience
AbstractLandslides 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 nearreal 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 5Hz. 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-andrescue operations.