| 四川及邻区地壳流与动力特征研究 |
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| 引用本文： | 范军,朱介寿,江晓涛,吴朋,杨宜海.四川及邻区地壳流与动力特征研究[J].中国地震研究,2016,30(1):57-73. |
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| 作者姓名： | 范军 朱介寿 江晓涛 吴朋 杨宜海 |
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| 作者单位： | 四川省地震局,成都市人民南路三段29号，成都 610041；成都理工大学,成都市成华区二仙桥东三路1号，成都 610059;成都理工大学,成都市成华区二仙桥东三路1号，成都 610059;中国电建集团贵阳勘测设计研究院有限公司，贵阳 550081;四川省地震局,成都市人民南路三段29号，成都 610041;成都理工大学,成都市成华区二仙桥东三路1号，成都 610059 |
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| 基金项目： | This research was funded by the key project of National Natural Science Foundation of China (Grant No． 40839909 and 41074062)． |
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| 摘 要： | Using the broadband seismic data of the regional stations in the Sichuan Digital Seismic Network and the mobile seismic stations in this region,the receiver function inversion method was adopted to study the characteristics of crustal flow and dynamic effects in Sichuan and adjacent areas. The results show that: Velocity in the crust and upper mantle of the Sichuan basin is significantly higher than that beneath the eastern margin of the Qinghai-Tibetan plateau. The velocity v_S is from 3. 6 to 3. 8km / s in the crust and4. 5- 4. 8km / s in the upper mantle beneath the basin,and there is no low-velocity layer in the crust. The lithology shows a hard block. The v_S velocity in the eastern margin of the Qinghai-Tibetan plateau is lower,with average v_Sof 3. 0- 3. 4km / s in the mid crust and4. 0- 4. 5km / s in the upper mantle. Low-velocity layers are distributed widely in the crust,most of which are in the mid crust at a depth of 20km- 40 km,and there are also a few low-velocity layers appearing in the upper crust at depths of 10km- 20 km and the lower crust at depths of 40km- 60 km. Affected by the northward pushing of the Indian plate,the eastward movement of the eastern margin of the Qinghai-Tibetan plateau is blocked by the hard Sichuan basin,producing a southward and southeastward component.Such movement process is produced by the complicated forces acting in this area. Just under the action of these forces, the eastern margin of the Qinghai-Tibetan plateau becomes a region with complicated geology and intensive earthquake activity. Obstructed by the hard Sichuan basin,the low-velocity crustal flow is delaminated and split into two or three upward and downward tributaries. The upward flow intruded into the upper crust,causing uplift of the earths urface,forming mountain crests; the downward flow intruded into the lower crust and upper mantle,resulting in thickening of the crust and depression of the Moho. The crustal flow in the eastern margin of the Qinghai-Tibetan plateau is mainly distributed along the active faults. The crustal flow flows out from the Qiangtang block in the middle part of the eastern margin of the Qinghai-Tibetan plateau,the mainstream flows along the NW-SE trending Xianshuihe fault zone,then turns NS and flows to the south along the Anninghe and Xiaojiang faults. There is another crustal flow in the north of the study area,flowing in the NE and E-W directions to the Longmenshan faults.
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| 关 键 词： | 四川及邻区 接收函数 地壳流 动力特征 |
| 收稿时间： | 2014/6/25 0:00:00 |
Research on Crustal Flow and Its Dynamic Characteristics in Sichuan and Its Adjacent Area |
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| Fan Jun,Zhu Jieshou,Jiang Xiaotao,Wu Peng and Yang Yihai.Research on Crustal Flow and Its Dynamic Characteristics in Sichuan and Its Adjacent Area[J].Earthquake Research in China,2016,30(1):57-73. |
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| Authors: | Fan Jun Zhu Jieshou Jiang Xiaotao Wu Peng and Yang Yihai |
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| Abstract: | |
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| Keywords: | Sichuan and its adjacent area Receiver function Crustal flow Dynamic characteristics |
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