| 藏东南及周边地区地震活动特征研究 |
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| 引用本文： | 张浪平,邵志刚,晏锐.藏东南及周边地区地震活动特征研究[J].地震,2011,31(3):9-18. |
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| 作者姓名： | 张浪平 邵志刚 晏锐 |
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| 作者单位： | 1. 中国地震局地震预测研究所,北京,100036
2. 中国地震台网中心,北京,100045 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务专项 |
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| 摘 要： | 藏东南及周边地区是印度板块与欧亚板块动力碰撞的影响区,该区历史地震活动强烈,曾发生过1950年墨脱-察隅8.6级和1951年当雄8.0级地震.本文首先介绍藏东南及周边地区的地质构造背景,其次通过考察该地区强震活动情况和活动地块边界带相关段落的加卸载响应比(LURR)时序特征,分析了研究区的强震活动状态.从历史地震活动看...
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| 关 键 词： | 地震活动图像 加卸载响应比(LURR) 活动地块边界带 藏东南及周边地区 |
Study on the Characteristics of Seismic Activity in Southeastern Tibet and Surrounding Areas |
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| ZHANG Lang-ping,SHAO Zhi-gang,YAN Rui.Study on the Characteristics of Seismic Activity in Southeastern Tibet and Surrounding Areas[J].Earthquake,2011,31(3):9-18. |
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| Authors: | ZHANG Lang-ping SHAO Zhi-gang YAN Rui |
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| Institution: | 1.Institute of Earthquake Science,CEA,Beijing 100036,China;2.China Earthquake Network Center,Beijing 100045,China) |
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| Abstract: | Southeastern Tibet and surrounding area is influenced by the dynamic collision between Indian plate and Eurasian plate,with strong historic seismic activity,including the 1950 Medog-Zayu M8.6 earthquake and the 1951 Dangxiong M8.0 earthquake.In this paper,we first presented the tectonic setting of Southeastern Tibet and surrounding areas firstly and then analysed the characteristics of seismic activity in this region by investigating activities of strong earthquakes and Load/Unload Response Ratio(LURR) time series of segments of the boundaries among active tectonic blocks.In view of the historical seismicity,we found a certain kinematical association between the Andaman arc and the eastern Himalayan system,and the current dynamic environment surrounding the study area is strong seismicly in the Andaman arc and seismicly quiescent in eastern Himalayan system.From the image of seismic activities,earthquakes with magnitude larger than or equal to 6.0 since 1980 have formed a circular seismic gap in southeastern Tibet and surrounding areas,whose spatial distribution is similar to that during the 10 years before the 1950 Medog-Zayu M8.6 earthquake.In terms of the LURR time series for segments of the active tectonic boundaries in the region,the eastern segment of Himalayan boundary is in the high stress state,followed by the Lancang River and Sanjiang tectonic boundaries. |
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| Keywords: | Image of seismic activities Southeastern Tibet and surrounding area Load/unload response ratio Active tectonic boundary |
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