青藏块体东北缘跨断层异常场地比指标及其在地震预测中的应用

doi:10.12196/j.issn.1000-3274.2020.02.005

Abstract

Abstract: In order to reflect abnormality of the cross-fault data before the earthquakes objectively, reduce the impact caused by non-uniformity of the sites layout, based on typical earthquake cases in the past, this paper summarizes the ratio of cross-fault anomalous site and tests by real earthquakes.The result shows: ① Ratio of anomalous site reduces rapidly with the epicenter distance increasing. Before the earthquake of magnitude 5.8 and above in the northeastern margin of the Qinghai-Tibet block, the anomalous site ratio within a range of 200 km from the epicenter is about 0.5. ② High value area of the anomalous site ratio contour has a good indication of the earthquake epicenter location and can be used as a quantitative criterion for earthquake prediction. ③ Multi-period spatial distribution characteristics of anomalous site ratio can describe the enhancement, attenuation or migration of cross-fault anomalies over time, which can provide some helpful for the determination of earthquake urgency.

Key words: Ratio of Cross-fault anomalous site, the Northeastern margin of Qinghai-Tibet block, the 2016 Menyuan M_S6.4 earthquake, the 2017 Jiuzhaigou M_S7.0 earthquake

CLC Number:

P315.7

LI Rui-sha, ZHANG Xi, JIA Peng, BAI Zhuo-li. The Ratio of Cross-fault Anomalous Site in the Northeastern Margin of Qinghai-Tibet Block and Application in the Earthquake Prediction[J]. EARTHQUAKE, 2020, 40(2): 71-81.

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The Ratio of Cross-fault Anomalous Site in the Northeastern Margin of Qinghai-Tibet Block and Application in the Earthquake Prediction

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