郯庐断裂带北段及邻区现代地震活动性与应力状态

qiang · 发表于 2010-4-8 10:10

]郯庐断裂带北段及邻区现代地震活动性与应力状态

葛荣峰　张庆龙　解国爱　徐士银　王锡勇　陈娟　

摘　要：收集了郯庐断裂带北段及邻区自1964年1月至2008年1月的1 254个ML≥2.0的地震数据和191条震源机制解、198条原地应力测量数据, 通过震中分布、震源深度、应变释放速率的分析计算和震源机制解及其它应力数据的统计, 探讨了郯庐北段现今的地震活动性和应力状态.结果表明, 郯庐断裂带北段及邻区的地震活动可分为日本海-长白山深震区、郯庐断裂带北段地震区、松辽盆地西缘地震区和松辽盆地内部地震区;郯庐断裂带北段现今地震强度较小, 频度较低, 但空间差异性显著, 依兰-伊通断裂活动性比敦化-密山断裂强, 且具有两端强而中间弱的分段活动特点;深震区P轴平均走向为288°, 倾角约31°, 断裂活动以逆断为主;郯庐断裂带北段附近浅震P轴走向以NEE-SWW向为主, 倾角平均26°, T轴走向以NNW-SSE向为主, 倾角平均23°, 断裂活动以走滑和逆断为主.浅震区和深震区主压应力方位存在差异, 这可能是在西太平洋板块低角度高速水平消减产生的NWW向挤压应力作用下, 郯庐断裂北段右行走滑派生的次级应力场的影响.
关键词：郯庐断裂带北段;震源机制解;地壳应力;西太平洋板块;中国东北
分类号：P315.5 　文献标识码：A
文章编号：0253-4967(2009)01-0141-14

SEISMIC ACTIVITY AND STRESS STATE OF THE NORTHERN TANLU FAULT ZONE AND ITS ADJACENT AREAS

GE Rong-feng　 ZHANG Qing-long　 XIE Guo-ai　 XU Shi-yin　 WANG Xi-yong　 CHEN Juan　

基金项目：国家自然科学基金重点项目(40634021)资助.
作者简介：葛荣峰, 男, 1986年出生, 现为南京大学地球科学系构造地质学专业在读研究生, 主要从事构造地质与地球动力学研究, 电话:025-83593734, E-mail: gerongfeng1986@sina.com.
作者单位：葛荣峰（南京大学地球科学与工程学院,南京,210093）　
　　　　　张庆龙（南京大学地球科学与工程学院,南京,210093）　
　　　　　解国爱（南京大学地球科学与工程学院,南京,210093）　
　　　　　徐士银（南京大学地球科学与工程学院,南京,210093）　
　　　　　王锡勇（南京大学地球科学与工程学院,南京,210093）　
　　　　　陈娟（南京大学地球科学与工程学院,南京,210093）　

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收稿日期：2008年1月7日

修稿日期：2008年5月14日

出版日期：2009年3月31日