| 三峡地区地震震源机制解初步研究 |
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| 引用本文： | 孙斌,唐新功.三峡地区地震震源机制解初步研究[J].防灾减灾学报,2015(3):108-112. |
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| 作者姓名： | 孙斌 唐新功 |
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| 作者单位： | 长江大学地球物理与石油资源学院,湖北 武汉,430100 |
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| 摘 要： | 根据三峡与邻近地区实际天然地震数据,利用GMT软件绘制出三峡地区两次地震的震源机制解。绘制出了三峡地区1964年以来地震震中分布情况,以及频率变化。震源机制解以及三峡与邻近地区断层资料显示出该地区受到西藏块体、四川盆地、川滇块体与鄂尔多斯地块的共同挤压作用,三峡及邻区的现今水平构造应力场的主压应力轴为北东东向,是喜马拉雅期构造应力场的继续。近东西向的向东移动显示出该地区可能为青藏高原地幔物质向东"逃逸"的通道之一。根据水库蓄水前后震源机制解资料反映的震源机制变化,认为蓄水对于三峡及邻区应力场在垂向上有一定的影响。
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| 关 键 词： | 三峡地区 震源机制解 诱发地震 构造应力 |
A PRELIMINARY STUDY ON EARTHQUAKE FOCAL MECHANISM IN THE THREE GORGES AREA |
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| Abstract: | According to the seismic data of the three gorges and adjacent area, focal mechanism solutions of the three gorges region is drawn by GMT software. Draw earthquake epicenter distribution and frequency changes since 1964.Focalmechanism solution and the three gorges and nearby area fault data shows nowadays the horizontal tectonic stress field in the three gorges and its adjacent area takes NE orientation as the principal compressive stress axes, because of the region block in Tibet, the Sichuan basin, Sichuan and Yunnan block and Ordos massif of squeezed together. Scholars deem it a continuation of the Himalayan tectonic stress field. Nearly east-west eastward movement shows that, there may exist a channel to the east in this region for the mantle material "escape" of the Qinghai-Tibet plateau. According to the focal mechanism solution, the focal mechanism was changed before and after the reservoir impoundment, shows impoundment has a certain influence on the stress field in three gorges and its adjacent area, major in vertical direction. |
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| Keywords: | the three gorges focal mechanism solution induced earthquakes tectonic stress field |
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