小江断裂带及其周边地区构造应力场特征
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摘要
应用Snoke方法计算了2000—2009年发生在小江断裂带及其周边地区的55个中小地震震源机制解.根据震源机制解分析,该区震源错动类型主要为走滑型,其次是逆断型,与小江断裂左旋走滑运动相符.整个区域主要受到近水平的北北西—南南东向挤压,自北向南主压应力轴方位从南东转为南南东,与川滇菱形块体沿南东—南南东向的走滑和旋转运动相一致.另外,构造应力方向在0～20 km内有从北西西转为北北西的趋势,考虑力轴仰角无明显变化,认为构造应力在此深度内是相对连续的.
The focal mechanisms of 55 moderate-small earthquakes(3.5≤ML≤5.6) in Xiaojiang fault zone and surrounding areas are calculated tentatively using Snoke methord.According to the result of focal mechanisms,we got some information.First,source faulting types are mainly of strike-slip fault,then thrust fault in the area of the studied time period.Xiaojiang fault zone are mainly of left-lateral strike-slip motion.The maximum compression in generally in horizontal NNW-SSE direction in the study area,The result shows that there is a clockwise rotation tendency for the direction of maximum compression from north to south in the study area,which is consistent with slip and rotation functions along the direction of SE—SSE in the inner part of the Sichuan-Yunnan rhombic block.The direction change of tectonic stress in 0—20 km under the earth's surface is NWW to NNW,consider of there is no obvious change of elevation of compressional axis,we think that the direction of tectonic stress is relatively continuous in the range.
The focal mechanisms of 55 moderate-small earthquakes(3.5≤ML≤5.6) in Xiaojiang fault zone and surrounding areas are calculated tentatively using Snoke methord.According to the result of focal mechanisms,we got some information.First,source faulting types are mainly of strike-slip fault,then thrust fault in the area of the studied time period.Xiaojiang fault zone are mainly of left-lateral strike-slip motion.The maximum compression in generally in horizontal NNW-SSE direction in the study area,The result shows that there is a clockwise rotation tendency for the direction of maximum compression from north to south in the study area,which is consistent with slip and rotation functions along the direction of SE—SSE in the inner part of the Sichuan-Yunnan rhombic block.The direction change of tectonic stress in 0—20 km under the earth's surface is NWW to NNW,consider of there is no obvious change of elevation of compressional axis,we think that the direction of tectonic stress is relatively continuous in the range.
引文
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[20]阚荣举,王绍晋,黄崐,等.中国西南地区现代构造应力场与板内断块相对运动[J].地震地质,1983,5(2):79-90.
[21]谢富仁,祝景忠,梁海庆,等.中国西南地区现代构造应力场基本特征[J].地震学报,1993,15(4):407-417.
[2]邓起东,张培震,冉勇康,等.中国活动构造与地震活动[J].地学前缘,2003,10(增刊):66-73.
[3]国家地震局震害防御司.中国历史强震目录[M].北京:地震出版社,1995.
[4]四川省地震局地震简目编辑组、云南省地震局地震简目编辑组、西藏处治区地震办公室地震简目编辑组.西南地震简目(川、滇、黔、藏)[M].四川:四川科学技术出版社,1988.
[5]王绍晋,龙晓帆,余庆坤.昆明地区现代构造应力场分析[J].地震研究,2005,28(2):178-184.
[6]荆振杰,杜义,谢富仁.昆明周边地区活动断层滑动与现代构造应力场[J].地震学报,2008,30(3):230-239.
[7]林向东,徐平,武敏捷,等.小江断裂中段及邻区构造应力场分布特征[J].中国地震,2010,26(2):192-200.
[8]俞维贤,刘玉权,何蔚.云南小江断裂带现今地壳形变特征与地震[J].地震地质,1997,19(1):17-21.
[9]王阎昭,王恩宁,沈正康,等.基于GPS资料约束反演川滇地区主要断裂带现今活动速率[J].中国科学D辑:地球科学,2008,38(5):582-597.
[10]钱晓东,秦嘉政.小江断裂带及周边地区强震危险性分析[J].地震研究,2008,31(4):354-362.
[11]许忠淮,阎明,赵仲和.由多个小地震推断的华北地区构造应力场的方向[J].地震学报,1983,5(3):268-279.
[12]SNOKE J A,MUNSEY J W,TEAGUE A G,et al.A program for focal mechanism determination by com-bined use of polarity and SV-P amplitude ratio data[J].Earthquake Notes,1984,55(3):15.
[13]刘杰,郑斯华,康英,等.利用P波和S波的初动和振幅比计算中小地震的震源机制解[J].地震,2004,24(1):19-24.
[14]孙长虹,蔡德超,钱荣毅,等.Snoke震源机制求解方法应用研究[J].地震地磁观测与研究,2010,31(4):7-13.
[15]李玉江,陈连旺,李红,等.云南地区构造应力应变场年变化特征的数值模拟[J].大地测量与地球动力学,2009,29(2):13-19.
[16]环文林,汪素云,宋昭仪.中国大陆内部走滑型发震构造的构造应力场特征[J].地震学报,1994,16(4):455-462.
[17]徐纪人,赵志新,石川有三.青藏高原中南部岩石圈扩张应力场与羊八井地热异常形成机制[J].地球物理学报,2005,48(4):861-869.
[18]申重阳,吴云,王琪,等.云南地区主要断层运动模型的GPS数据反演[J].大地测量与地球动力学,2002,22(30):46-51.
[19]宋方敏,汪一鹏,俞维贤.小江断裂带[M].北京:地震出版社,1998.
[20]阚荣举,王绍晋,黄崐,等.中国西南地区现代构造应力场与板内断块相对运动[J].地震地质,1983,5(2):79-90.
[21]谢富仁,祝景忠,梁海庆,等.中国西南地区现代构造应力场基本特征[J].地震学报,1993,15(4):407-417.
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