| 2010年青海玉树地震及震后青藏高原强震趋势分析 |
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| 引用本文： | 钱晓东,秦嘉政.2010年青海玉树地震及震后青藏高原强震趋势分析[J].地震研究,2010,33(4). |
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| 作者姓名： | 钱晓东 秦嘉政 |
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| 作者单位： | 云南省地震局; |
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| 基金项目： | 云南省重点项目，云南省重点项目 |
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| 摘 要： | 2010年4月14日青海玉树发生7.1级地震,这是该区历史上发生的最为强烈的地震。该地震属走滑型,地处青藏高原巴颜喀拉地块南边界,发震断裂为甘孜—玉树—风火山左旋走滑断裂,地震破裂主要向震中东南方向。该地震是巴颜喀拉地块与羌塘地块以不同速率向东运动,地块间的差异运动使其边界应力积累到一定程度引发破裂的结果。根据地震定标律估算的主震断层破裂参数和应力参数为:地震矩M0=1.78×1019N.m,矩震级MW=6.8,断层破裂面积S=468km2,断层错距D=1.4m,断层破裂长度L=37km,断层破裂宽度W=12.6km,剪应力τ0=16.8MPa,应力降Δσ=7.03MPa。历史地震分析表明,玉树7.1级地震是在世界8级以上地震、中国西部大三角7.8级以上地震、南北地震带7级以上地震和巴颜喀拉块体7级以上地震处于强烈活动背景下发生的。玉树地震后,青藏高原巴颜喀拉地块、羌塘地块及川滇菱形块体未来发生7级以上地震的危险性较大。
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| 关 键 词： | 玉树地震 震源机制 青藏高原 活动地块 强震活动 |
2010 Earthquake in Yushu, Qinghai Province and Strong Earthquake Trend Analysis of the Qinghai-Tibet Plateau after the Earthquake |
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| QIAN Xiao-dong,Qin Jia-zheng.2010 Earthquake in Yushu, Qinghai Province and Strong Earthquake Trend Analysis of the Qinghai-Tibet Plateau after the Earthquake[J].Journal of Seismological Research,2010,33(4). |
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| Authors: | QIAN Xiao-dong Qin Jia-zheng |
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| Institution: | QIAN Xiao-dong,Qin Jia-zheng(Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China) |
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| Abstract: | On April 14,2010,an earthquake of magnitude 7.1 occurred in Yushu,Qinghai Province,it is the strongest earthquake that have ever taken place in this region.The earthquake is a strike-slip earthquake in the plateau,the Bayankala block south boundary.Seismogenic fault is Ganzi-Yushu-Fenghuoshan left-lateral and strike-slip fault,the earthquake major rupture to the southeast of the epicenter.The earthquake results from the Bayankala block and Qiangtang block east at different rates of movement,differential mov... |
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| Keywords: | Yushu earthquake focal mechanism Qinghai-Tibet Plateau active block strong seismicity |
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