2008年西藏4次MS6.0以上地震前拉萨地电场异常信号特征

Abstract

Abstract: In 2008, four M_S6.0 earthquakes occurred in Tibet, i.e. the Jan.9 Gaize M_S6.9, the Aug.25 Zhongba M_S6.8, the Sep. Zhongba county M_S6.0 and the Oct.6 Dangxiong M_S6.6 earthquakes. By examing and analysing data from Lhasa station, we found that there are obvious abnormal geoelectric signals before these four moderate-strong earthquakes. For far earthquakes, the earthquake magnitude is linearly related to the logorithm of the product of abnormaly and epicentral distance, and in the time period of anomaly before earthquakes, the polarized vectors deviate from the normal directions. It was found that these anormalou signals have a high degree of reliability because the Lhasa sation has a better observing environment without large industrial installation nearby.

Key words: Geoelectric field, Lhasa seismic station, Earthqauke in Tibet, Multi-separation Array observation system

CLC Number:

P315.7

MA Qin-zhong, TANG Yu-xiong, ZHANG Yong-xian. Abnormal Characterisrics of Geoelectric Field at Lhasa Station before 4 M_S6.0 Earth- quakes of 2008 in Tibet[J]. EARTHQUAKE, 2011, 31(1): 86-97.

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Abnormal Characterisrics of Geoelectric Field at Lhasa Station before 4 M_S6.0 Earth- quakes of 2008 in Tibet

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Abnormal Characterisrics of Geoelectric Field at Lhasa Station before 4 MS6.0 Earth- quakes of 2008 in Tibet

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Abnormal Characterisrics of Geoelectric Field at Lhasa Station before 4 M_S6.0 Earth- quakes of 2008 in Tibet