山东及附近区域地震断层错动性质与地壳应力场特征
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摘要
利用P、SH、SV波的初动及振幅比获得2001年4月至2012年8月山东及附近区域132次地震震源机制解,对该区域地震断层的错动性质及地壳应力场特征进行分析。结果表明,山东及附近区域地震断层错动的基本方向为北东向和北西向,错动方式以走向滑动为主,部分为斜向滑动。分区研究表明:聊考断裂带附近区域所受挤压作用相对较强,逆断型地震破裂较多;胶东半岛及北侧海域所受拉张作用略占优势,逆断型地震破裂较少;沂沐断裂带南部附近区域逆断型与正断型的地震破裂所占比例差别不大。
The properties of earthquake fault slip and characteristics of the contemporary tectonic stress field of Shandong and nearby regions is analyzed based on 132 times focal mechanism solutions which obtained by P,SH and SV wave initial motion and amplitude from April2001 to August 2012.Results show that the earthquake fault slip extend at large in NE and NW direction,the movements of earthquake faults are mainly of strike-slip with small number of oblique-slip.The sub-regions studies have shown that,the compression is relatively strong in Liao-kao fault area and the tensile is slightly dominant in Jiaodong peninsula and its northern sea area;the thrust fault earthquake rupture significantly more than the normal fault rupture in Liao-kao fault zone;In Jiaodong peninsula and its northern side of the sea area,the thrust fault rupture is far less than the normal fault rupture;the normal fault rupture is as much as the thrust fault earthquake rupture in the southern section of Yishu fault zone and its neighbor areas.
The properties of earthquake fault slip and characteristics of the contemporary tectonic stress field of Shandong and nearby regions is analyzed based on 132 times focal mechanism solutions which obtained by P,SH and SV wave initial motion and amplitude from April2001 to August 2012.Results show that the earthquake fault slip extend at large in NE and NW direction,the movements of earthquake faults are mainly of strike-slip with small number of oblique-slip.The sub-regions studies have shown that,the compression is relatively strong in Liao-kao fault area and the tensile is slightly dominant in Jiaodong peninsula and its northern sea area;the thrust fault earthquake rupture significantly more than the normal fault rupture in Liao-kao fault zone;In Jiaodong peninsula and its northern side of the sea area,the thrust fault rupture is far less than the normal fault rupture;the normal fault rupture is as much as the thrust fault earthquake rupture in the southern section of Yishu fault zone and its neighbor areas.
引文
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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):19-26.
山长仑,孙庆文,李镇军.2003年6月青岛震群地震震源机制与震源区应力场特征[J].地震地磁观测与研究,2006,27(5):12-16.
山长仑,李永红,李霞,等.山东及附近区域部分中小地震震源机制特征分析[J].华北地震科学,2007,25(4):27-30.
汪素云,许忠淮.中国东部大陆的地震构造应力场[J].地震学报,1985,7(1):17-32.
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.
许忠淮,汪素云,黄雨蕊,等.由大量地震资料推断的我国大陆构造应力场[J].地球物理学报,1 989,32(6):636-647.
许忠淮,阎明,赵仲和.由多个小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.
周翠英,王铮铮,蒋海昆,等.华东地区现代地壳应力场及地震断层错动性质[J].地震地质,2005,27(2):273-287.
Snoke J A,Munsey J W?Teague A G,et al.A program for focal mechanism determination by combined use of polarity and SV—P amplitude ratio data[J].Earthquake Notes,1984,55(3):15—22.
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