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Study on the Source Parameters of Earthquakes in the Middle Eastern Area of North Tianshan in Xinjiang

Zhao Cuiping Xia Aiguo Zheng Sihua Chen Zhangli

中国地震研究(英文版)2005，Vol.19Issue(4)：381-390,10.
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中国地震研究(英文版)2005，Vol.19Issue(4)：381-390,10.

Study on the Source Parameters of Earthquakes in the Middle Eastern Area of North Tianshan in Xinjiang

Study on the Source Parameters of Earthquakes in the Middle Eastern Area of North Tianshan in Xinjiang

Zhao Cuiping 1Xia Aiguo 2Zheng Sihua 2Chen Zhangli3

作者信息

  • 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
  • 2. Earthquake Administration of Xinjiang Uggur Autonomous Region, Urumqi 830011, China
  • 3. Institute of Earthquake Sciences , CEA, Beijing 100036, China
  • 折叠

摘要

Abstract

By applying the empirical Green's function method, we first proved that the source spectra in the middle eastern area of North Tianshan follow the ω-2 Brune model, and then, on this basis, obtained the source spectra for 105 earthquakes of ML 2.5 ～ 5.7 in the studied area upon removing the noise, instrument, propagation and site effectsintheobservationalseismicSwaveforms. Finally, we determined the source parameters such as the seismic moment, stress drop, source dimension, etc., based on the Brune model. The results show that there is a good linear correlation between scalar seismic moment, M0, and ML, which is Log10M0=1.10 ML + 17.20; The source radii range between 100 ～1500m;the stress drop, 1 ～ 16MPa with a predominant range of 1 ～10MPa. The relationship of the seismic moment versus corner frequencies indicates that there may exist two source scaling, that is, when M0 ＜ 4 × 1021 dyne·cm (equal to an ML4.0event), stress drop is weakly dependent on M0; whereas, when M0＞4 ×1021dynecm,stress drop is independent of M0.

关键词

North Tianshan in Xinjiang/Source spectrum/Source model/Source parameter/Source scaling

Key words

North Tianshan in Xinjiang/Source spectrum/Source model/Source parameter/Source scaling

分类

天文与地球科学

引用本文复制引用

Zhao Cuiping,Xia Aiguo,Zheng Sihua,Chen Zhangli..Study on the Source Parameters of Earthquakes in the Middle Eastern Area of North Tianshan in Xinjiang[J].中国地震研究(英文版),2005,19(4):381-390,10.

基金项目

The study was jointly sponsored by the National Natural Science Foundation of China (Project Number: 50468003) and the Laboratory of Seismicity Patterns and Application of Digital Observations of Center for Analysis and Prediction, CEA. （Project Number: 50468003）

中国地震研究(英文版)

2096-9996

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