近期新疆震源机制解与地震活动特征研究
|
摘要
分析了2003-2009年新疆及其周边88次中强震震源机制解及其分布特征,并结合同期地震活动特点与区域应力场进行了讨论。认为:这一期间新疆主要受NNW向水平挤压应力制约,与1990-2002年新疆主压应力P轴NNE向分布有一定差异;中强震震源断层具有多样性,显示出新疆构造运动的复杂性;主压应力P轴仰角的变化与新疆地震活动的强弱交替相关;研究时段内不同强度的地震空间分布具有较明显的层次性特征。
The focal mechanism solutions and the distribution characteristic of 88 moderate-strong earthquakes in Xinjiang and its adjacent area from 2003 to 2009 are analyzed.The related discussion is given combining with the seismic activity characteristics and the region stress field in the same period.The result shows that stress field in Xinjiang area is mainly controlled by level pressure stress in NNW direction in this period,with certain difference from the principal compress stress P axis distribution in NNE from 1990 to 2002.The seismogenic faults of moderate-strong earthquakes exist certain multiplicity,it demonstrates the complexity of tectonic movement in Xinjiang area.The elevation angle′s change of principal compression stress P axis is related with alternation of strong and the weak of seismic activity.In the research time,the spatial distribution with different magnitude earthquakes have obvious level characteristic.
The focal mechanism solutions and the distribution characteristic of 88 moderate-strong earthquakes in Xinjiang and its adjacent area from 2003 to 2009 are analyzed.The related discussion is given combining with the seismic activity characteristics and the region stress field in the same period.The result shows that stress field in Xinjiang area is mainly controlled by level pressure stress in NNW direction in this period,with certain difference from the principal compress stress P axis distribution in NNE from 1990 to 2002.The seismogenic faults of moderate-strong earthquakes exist certain multiplicity,it demonstrates the complexity of tectonic movement in Xinjiang area.The elevation angle′s change of principal compression stress P axis is related with alternation of strong and the weak of seismic activity.In the research time,the spatial distribution with different magnitude earthquakes have obvious level characteristic.
引文
[1]许忠淮,汪素云,黄雨蕊,等.由大量的地震资料推断的我国大陆构造应力场[J].地球物理学报,1989,32(6):636-647.
[2]汪素云,高阿甲,许忠淮.中国及邻区地震震源机制特征[A]∥国家地震局震害防御司编.中国地震区划文集[G].北京:地震出版社,1993:10-26.
[3]阚荣举,张四昌,晏凤桐,等.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-108.
[4]谢富仁,崔效锋,赵建涛,等.中国大陆及邻区现代构造应力场分区[J].地球物理学报,2004,47(4):654-662.
[5]新疆地震局.天山地震目录级中强震震源机制解[J].内陆地震,1997,11(增刊):127-180.
[6]高国英,温和平,聂晓红.1991-2002年新疆中强震震源机制解分析[J].地震,2005,25(1):81-87.
[7]许忠淮,戈澍谟.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,1984,8(5):395-404.
[8]刁桂苓,于利民,李钦祖.震源机制解的系统聚类分析[J].中国地震,1992,8(3):86-92.
[9]高国英,龙海英,聂晓红,等,2008年乌恰6.9级地震与新疆地震趋势研究[J].西北地震学报,2009,31(4):397-402.
[10]刘代芹,王晓强,李杰.新疆南天山地区重力场动态演化特征[J].西北地震学报,2009,31(2):174-178.
[11]邓起东,冯先岳,张培震,等.天山活动构造[M].北京:地震出版社,2000:8.
[12]王盛泽,高国英,新疆及邻近地区现代构造应力场的区域特征[J].地震学报,1992,14(增刊):612-620.
[13]王晓强,李杰,等.利用GPS形变资料研究天山及邻近地区地壳水平位移与应变特征[J].地震学报,2007,29(1):32-36.
[2]汪素云,高阿甲,许忠淮.中国及邻区地震震源机制特征[A]∥国家地震局震害防御司编.中国地震区划文集[G].北京:地震出版社,1993:10-26.
[3]阚荣举,张四昌,晏凤桐,等.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-108.
[4]谢富仁,崔效锋,赵建涛,等.中国大陆及邻区现代构造应力场分区[J].地球物理学报,2004,47(4):654-662.
[5]新疆地震局.天山地震目录级中强震震源机制解[J].内陆地震,1997,11(增刊):127-180.
[6]高国英,温和平,聂晓红.1991-2002年新疆中强震震源机制解分析[J].地震,2005,25(1):81-87.
[7]许忠淮,戈澍谟.用滑动方向拟合法反演富蕴地震断裂带应力场[J].地震学报,1984,8(5):395-404.
[8]刁桂苓,于利民,李钦祖.震源机制解的系统聚类分析[J].中国地震,1992,8(3):86-92.
[9]高国英,龙海英,聂晓红,等,2008年乌恰6.9级地震与新疆地震趋势研究[J].西北地震学报,2009,31(4):397-402.
[10]刘代芹,王晓强,李杰.新疆南天山地区重力场动态演化特征[J].西北地震学报,2009,31(2):174-178.
[11]邓起东,冯先岳,张培震,等.天山活动构造[M].北京:地震出版社,2000:8.
[12]王盛泽,高国英,新疆及邻近地区现代构造应力场的区域特征[J].地震学报,1992,14(增刊):612-620.
[13]王晓强,李杰,等.利用GPS形变资料研究天山及邻近地区地壳水平位移与应变特征[J].地震学报,2007,29(1):32-36.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心