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| Titel |
Areal strain changes induced by remote triggering of Wenchuan earthquake of 12 May 2008 |
| VerfasserIn |
C.-Y. Chen, J.-C. Hu, C.-C. Liu |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250027702
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| Zusammenfassung |
| project of monitoring of the fault activity using 3-component Gladwin Tensor Strainmeter
(GTSM) was initiated by the Central Geological Survey of Taiwan in October 2003. These
instruments are intended to supplement the deformation observations from the continuous
GPS arrays as part of a systematic program of plate boundary observation across Taiwan
orogenic belt. These instruments are installed at a depth of approximately 200 meters at 13
sites of 4 clusters which provide 3 component strain data on both crustal strain accumulation
and transient strain variations induced by environmental change such as meteorological
effect and earthquakes. The Mw 7.9 Wenchuan earthquake of 12 May 2008 was the
most devastating earthquake in China in the past 30 years in terms of human losses
and property damage. The main shock ruptured with about 9 m of slip along the
Longmen Shan fault zone located the boundary of Tibetan plateau and Sichuan basin.
About 5-6 m maximum vertical offset was identified in the field survey after the
earthquake. Nine borehole strainmeters installed at western Foothills in Taiwan
orogenic belt captured significant step-like variation of areal strain. The areal strain
increasing was observed from 0.01 to 0.2 microstrain at five boreholes located in Chiayi
area southwestern Taiwan and Hisnchu area northwest Taiwan. The areal strain
decreasing was also observed from 0.05 to 4 mricostrain at three boreholes located at
Hisnchu and Taipei area of northwest Taiwan. We attribute these step-like transient
variations of areal strain to the dynamic triggering of the Wenchuan earthquake. |
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