GEOSCAN, résultats de la recherche


TitreLocating, monitoring, and characterizing typhoon-induced landslides with real-time seismic signals
AuteurKao, 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,
Séries alt.Secteur des sciences de la Terre, Contribution externe 20110361
Documentpublication en série
Mediaen ligne; numérique
Sujetsglissements de terrain; coulées boueuses; dépôts de glissement de terrain; dépôts de coulée de débris; méthodes statistiques; statistiques; dépôts de pentes; glissements de pentes; stabilité des pentes; sismicité; sismographes; géologie de l'ingénieur; géomathématique; géophysique
Illustrationsgraphs; plots; seismograms
ProgrammeTargeted Hazard Assessments in Western Canada, Géoscience pour la sécurité publique
Résumé(disponible en anglais seulement)
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 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.