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| Titel |
Mapping the b-values along the Longmenshan fault zone before and after the 12 May 2008, Wenchuan, China, MS 8.0 earthquake |
| VerfasserIn |
Y. Z. Zhao, Z. L. Wu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 6 ; Nr. 8, no. 6 (2008-12-10), S.1375-1385 |
| Datensatznummer |
250005909
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1375-2008.pdf |
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| Zusammenfassung |
| The b-value in the Gutenberg-Richter frequency-magnitude distribution, which
is assumed to be related to stress heterogeneity or asperities, was mapped
along the Longmenshan fault zone which accommodated the 12 May 2008,
Wenchuan, MS 8.0 earthquake. Spatial distributions of b-value before and
after the Wenchuan earthquake, respectively, were compared with the slip
distribution of the mainshock. It is shown that the mainshock rupture
nucleated near to, but not within, the high-stress (low b-value) asperity in
the south part of the Longmenshan fault, propagating north-eastward to the
relatively low stress (high b-value) region. Due to the significant
difference between the rupture process results from different sources, the
comparison between slip distribution and pre-seismic b-value distribution
leads to only conclusion of the rule-of-thumb. The temporal change of
b-value before the mainshock shows a weak trend of decreasing, being hard to
be used as an indicator of the approaching of the mainshock. Distribution of
b-values for the aftershocks relates the termination of the mainshock rupture
to the harder patch along the Longmenshan fault to the north. |
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