| 2003—2008年新疆区域构造应力场特征探讨 |
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| 引用本文： | 高国英,聂晓红,龙海英.2003—2008年新疆区域构造应力场特征探讨[J].地震地质,2010,32(1):70. |
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| 作者姓名： | 高国英 聂晓红 龙海英 |
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| 作者单位： | 新疆维吾尔自治区地震局,乌鲁木齐,830011 |
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| 摘 要： | 给出了2003—2008年新疆74次MS≥4.5地震的震源机制解。分析了该期间震源机制反映出的新疆区域应力场特征,并结合1990—2008年的地震活动图像和区域应力场进行了讨论。结果认为:1990—2003年与2004—2008年新疆MS≥5地震活动空间分布图像存在较大的差异性;震源机制得到的主压应力P轴方位为NNW向,与新疆近SN向的背景应力场和作者前期给出的NNE向结果略有差异,反映出不同时期新疆大区域应力场的变化特点;中强地震震源机制主压应力P轴仰角的大小变化与新疆地震活动的强弱相关性明显。
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| 关 键 词： | 震源机制解 地震活动 区域应力场 P轴仰角 |
DISCUSSION ON THE CHARACTERISTICS OF REGIONAL TECTONIC STRESS FIELD OF XINJIANG FROM 2003 TO 2008 |
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| Abstract: | The paper presents the focal mechanism solutions of 74 earthquakes with MS≥4.5 from 2003 to 2008 in Xinjiang and analyzes the regional stress field characteristics reflected by these focal mechanism solutions in Xinjiang in this period.Then,discussion has been made combining with the seismicity image and regional stress field from 1990 to 2008.The result shows that,spatial seismic activity patterns of earthquakes with MS≥5 in Xinjiang are quite different between 1990-2003 and 2004-2008.The seismic activity of mid-strong earthquakes or larger from 1990 to 2003 concentrated in the Aletai seismic belt,the eastern Tianshan mountains and the Arjin-Kunlun mountains tectonic belt.During this period,there occurred respectively the MS7.3 Zaisang earthquake in June,1990,the MS7.8 Mani earthquake in 1997,the MS8.1 west of Kunlun mountain pass earthquake in 2001and the MS7.9 earthquake in the border area between China,Russia and Mongolia in 2003.Since 2004,the seismic activity of mid-strong earthq |
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| Keywords: | focal mechanism solutions seismic activity regional stress field elevation angle of P axis |
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