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| Titel |
Global Behaviors of Stress Drop, Radiated Energy and Rupture Velocity Extracted from an Exhaustive Catalog of Earthquake Source Time Functions. |
| VerfasserIn |
Agnès Chounet, Martin Vallée |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107641
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| Publikation (Nr.) |
 EGU/EGU2015-7350.pdf |
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| Zusammenfassung |
| The SCARDEC method (Vallée et al, 2011) gives us access to the focal mechanism and the
relative Source Time Functions (RSTFs) of the Mw > 5.8 earthquakes of the past 20 years,
leading to a catalog of more than 2000 earthquakes.
This allows us to make an exhaustive analysis of two main rupture process properties : the
static stress drop δÏă and the apparent stress μEr/Mo. We have insights about the stress drop
variations through the peak of the average STF, scaled to the seismic moment :
Fmscaled / δÏă1/3V r (with Vr being the rupture velocity), and radiated energy is obtained
through integration of STF squared first derivative. Our estimations indicate at the
global scale an invariant stress drop with moment magnitude Mw, while Er/Mo
slightly increases with Mw. A focus on thrust interplate subduction earthquakes (700
events) shows that, among normal and inverse shallow earthquakes (a subset of 1500
earthquakes, z |
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