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| 引用本文： | 李强,赵旭,蔡晋安,刘瑞丰,赵翠萍.???????????????????????????????о?[J].大地测量与地球动力学,2010,30(5):1-7. |
| 作者姓名： | 李强 赵旭 蔡晋安 刘瑞丰 赵翠萍 |
| 作者单位： | 1. 地壳运动监测网络工程研究中心,北京,100036 2. 中国地震台网中心,北京,100045 3. 中国地震局地震预测研究所,北京,100036 |
| 基金项目： | 国家自然科学基金，国家科技支撑计划重点项目 |
| 摘 要： | ???????P??????????????????????????????о????????????????????????????????????????????????????￡????????????????????????????????????????????????????????????????????????????????γ???????????????? ????????????????????????????????????????????????????????????????????????????????????￡???????????????????????Ρ???????????????????????????????????????????μ???ж????????????????????????????????? |
| 关 键 词： | ??????????? ??????????? ??? ??????? ???????? |
STUDY ON TECTONIC ENVIRONMENT OF DEEP CRUST AND SEISMOGENESIS OF EARTHQUAKES BENEATH MAIN THREE GORGES RESERVOIR AREA |
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| Li Qiang,Zhao Xu,Cai Jin'an,Liu Ruifeng,Zhao Cuiping.STUDY ON TECTONIC ENVIRONMENT OF DEEP CRUST AND SEISMOGENESIS OF EARTHQUAKES BENEATH MAIN THREE GORGES RESERVOIR AREA[J].Journal of Geodesy and Geodynamics,2010,30(5):1-7. | |
| Authors: | Li Qiang Zhao Xu Cai Jin'an Liu Ruifeng Zhao Cuiping |
| Institution: | 1)National Earthquake Infrastructure Service,Beijing 1000362)China Earthquake Network Center,Beijing 1000453)Institute of Earthquake Science, CEA, Beijing 100036 |
| Abstract: | The relationship between the tectonic environment of deep crust and earthquakes are investigated, and the seismogenesis of earthquakes are further discussed, using the P wave tomography beneath the Three Gorges reservoir dam and adjacent regions and earthquakes occurred before the impoundment of the Three Gorges reservoir. The main results indicate: the earthquakes which took place in the Three Gorges area, are closely associated with the tectonic environment of deep crust, most of those events occurred in or around the velocity gradient belts, whose formation are influenced by various factors of deep tectonics, are mainly developed by the bordering on the high velocity anomaly with low velocity anomaly. The aforementioned phenomenon shows that the velocity gradient belt, which is considered as one of the most active places where the deep plate motions exist, is similar to the characteristics of buried fault zones. The regional tectonic stress field, deformation, dilation and upwards perturbation field and tensile stress generated by the partially molten materials of upper mantle, and thermal stress, which jointly contribute to the Three Gorges area, then lead to the activities of the faulting zones and buried faults and possibly activate the new ruptures, finally trigger earthquakes. |
| Keywords: | Three Gorges reservoir area tectonic environment of deep crust impoundment seismogenesis buried fault |
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