| 重庆地区地震震源机制解及动力环境分析 |
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| 关键词:focal mechanism stress Qiyaoshan fault Huayingshan fault Chongqing |
| 基金项目:中国地质调查局地质调查项目(编号: DD20160268);国家自然科学基金面上项目(编号: 41574049) |
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| Focal Mechanisms of Earthquakes in Chongqing and Geodynamical Implications |
| Using waveforms recorded by about one hundred seismic stations of the China Seismic Network and the phase-based method of FOCMEC, the authors determined focal mechanisms of the Ms 5.0 earthquake that occurred on November 23, 2017, in Wulong and the Ms 4.9 earthquake on December 27, 2016, in Rongchang. The authors also collected focal mechanisms of other earthquakes which recently occurred in Chongqing. The results show that the Wulong earthquake along southern Qiyaoshan fault was an oblique normal fault activity, similar to another earthquake recently occurred in Shizhu along central Qiyaoshan fault. It is therefore inferred that the Qiyaoshan fault was characterized by normal activities. The Rongchang earthquake along southern Huayingshan fault was a reverse fault activity with strike-slip component, therefore, the (southern) Huayingshan fault was characterized by reverse activities. On a regional view of focal mechanism, the western part of Chongqing where the Huayingshan fault is located is mainly controlled by compressional stress in rough E–W direction, which is similar to the stress environment in South China. The central and eastern part of Chongqing where the Qiyaoshan fault is located is mainly controlled by compressional stress in rough S–N direction, but the stress field is different from background (rough E–W) stress environment in South China. All these data indicate that the areas from the central and eastern part of Chongqing to Hubei–Hunan plain are in a special dynamic environment. In fact, the areas are in the transition region between two global tectonic domains, i.e., Tethyan and circum-Pacific tectonic domains. The distinctive present stresses imply that the region from central and eastern Chongqing to Hubei–Hunan plain seems not to be affected by the two global tectonic domains in the present. |
| FENG Mei,AN Mei-jian,WU Zhong-hai,TAN Cheng-xuan.2019.Focal Mechanisms of Earthquakes in Chongqing and Geodynamical Implications[J].Acta Geoscientica Sinica,40(2):319-328. |
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