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| Titel |
The implications of regional seismicity in Longmenshan fault zoneduring the
2008 Ms 8.0 Wenchuan earthquake |
| VerfasserIn |
Huai Zhang, Jingjing Wang, Yaolin Shi, David Yuen |
| 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 |
250122463
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| Publikation (Nr.) |
 EGU/EGU2016-1504.pdf |
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| Zusammenfassung |
| The Ms 8.0 Wenchuan earthquake on May 12, 2008 may have significantly changed the
regional seismicity pattern. In this study, we apply the Z-test statistical method to the seismic
data from 2003 to 2013 to investigate changes of regional seismicity rates and their statistical
significance in LFZ and its neighboring regions. Our primary results show that, due to the
2008 Wenchuan earthquake, seismicity rates have significantly increased in Eastern
Kunlun fault, southern Longmenshan fault, Longquanshan fault and Huayingshan
fault in Sichuan basin, but have significantly decreased in northern and central
Longmenshan fault, vicinity of the Songpan-Minjiang fault, and Fubianhe fault
in Bayankala block. We analyze changes of the Z value with respect to time and
seismic magnitude in each region, and find that small seismic events (<Ms 3.0) are
more appropriate to be used for analyzing changes of seismicity rates than large
events. Our results confirm predictions of Coulomb failure stress changes for most
regions and fault zones, revealing that our current statistical method applied to
seismic data is reliable and efficient for analyzing seismicity rate changes after
a big earthquake. Statistical analysis of seismic data can be combined together
to evaluate regional seismicity and future earthquake hazards and its mitigation. |
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