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| Titel |
Erosion influence the seismicity of active thrust faults |
| VerfasserIn |
Philippe Steer, Martine Simoes, Rodolphe Cattin, J. Bruce H. Shyu |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250133246
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| Publikation (Nr.) |
 EGU/EGU2016-13834.pdf |
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| Zusammenfassung |
| Assessing seismic hazards remains one of the most challenging scientific issue in Earth
sciences. Deep tectonic processes are classically considered as the only persistent mechanism
driving the stress loading of active faults over a seismic cycle. Here we show with a
mechanical model that erosion also significantly influences the stress loading of thrust faults
at the timescale of a seismic cycle. Indeed, erosion rates of about ∼0.1 to 20 mm/yr, as
documented in Taiwan and in other active compressional orogens, can raise the Coulomb
stress by ∼0.1 to ∼10 bar on the nearby thrust faults over the inter-seismic phase. Mass
transfers induced by surface processes in general, during continuous or short-lived and
intense events, represent a prominent mechanism for inter-seismic stress loading of faults
near the surface. Such stresses are probably sufficient to promote the rupture of deep
continental earthquakes up to the surface or to trigger shallow seismicity. We illustrate
this last point by identifying seismic events in Taiwan, by the mean of a coupled
statistical and mechanical approach, that were induced by intense erosional events. |
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