郯庐断裂带北段及邻区现代地震活动性与应力状态
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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1254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。
1254 ML≥2.0 earthquakes from Jan.1964 to Jan.2008,191 focal mechanism solutions and 198 in-situ stress measurement data in the northern Tanlu Fault zone and its adjacent areas are collected to analyze the seismic activity,structural stress state and fault movement of the northern Tanlu Fault zone through the calculation of epicenter distribution,focal depth,strain release rate and the statistics of focal mechanism solutions and other stress data.The results indicate that the study area can be partitioned into four seismic belts or regions,namely the Sea of Japan to Changbai Mountains deep seismic belt,the northern Tanlu Fault seismic belt,the western margin of Songliao basin seismic belt and the inner Songliao basin seismic belt.The seismic activity of the northern Tanlu Fault zone is weak and inhomogeneous.The Yilan-Yitong Fault is more active than the Dunhua-Mishan Fault,and shows segmentation behavior that is stronger at both sides than the middle part.The maximal stress axis(P-axis) in the deep seismic belt trends 288° on average,dipping 31° and the main fault movement mode is reverse.Near the northern Tanlu Fault zone the P-axis mainly trends NEE-SWW,dipping 26° on average,the T-axis mainly trends NNW-SSE,dipping 23° on average and the main fault movement mode is strike-slip with reverse.The maximal stress axis presents an obvious difference between the shallow and deep earthquake belts,resulting probably from the influence of the secondary stress field derived from the dextral strike-slip of the northern Tanlu Fault zone under the NWW compression due to the low-angle high-speed subduction of the western Pacific plate.
1254 ML≥2.0 earthquakes from Jan.1964 to Jan.2008,191 focal mechanism solutions and 198 in-situ stress measurement data in the northern Tanlu Fault zone and its adjacent areas are collected to analyze the seismic activity,structural stress state and fault movement of the northern Tanlu Fault zone through the calculation of epicenter distribution,focal depth,strain release rate and the statistics of focal mechanism solutions and other stress data.The results indicate that the study area can be partitioned into four seismic belts or regions,namely the Sea of Japan to Changbai Mountains deep seismic belt,the northern Tanlu Fault seismic belt,the western margin of Songliao basin seismic belt and the inner Songliao basin seismic belt.The seismic activity of the northern Tanlu Fault zone is weak and inhomogeneous.The Yilan-Yitong Fault is more active than the Dunhua-Mishan Fault,and shows segmentation behavior that is stronger at both sides than the middle part.The maximal stress axis(P-axis) in the deep seismic belt trends 288° on average,dipping 31° and the main fault movement mode is reverse.Near the northern Tanlu Fault zone the P-axis mainly trends NEE-SWW,dipping 26° on average,the T-axis mainly trends NNW-SSE,dipping 23° on average and the main fault movement mode is strike-slip with reverse.The maximal stress axis presents an obvious difference between the shallow and deep earthquake belts,resulting probably from the influence of the secondary stress field derived from the dextral strike-slip of the northern Tanlu Fault zone under the NWW compression due to the low-angle high-speed subduction of the western Pacific plate.
引文
[1]中国大陆地壳应力环境基础数据库网址:http://www.eq-netlab.com/homepage.htm。
[1]同142页[1]。
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[1]同142页[1]。
[1]王良书等,2006,郯庐断裂带北段构造体制转换与相关油气盆地演化,中国石化东北勘探新区项目报告。
晁洪太,王志才,刘西林.1999.郯庐断裂带下辽河—莱州湾段与潍坊—嘉山段地震构造和地震活动特征对比[J].华北地震科学,17(2):36—42.CHAO Hong-tai,WANG Zhi-cai,LIU Xi-lin.1999.Comparison of seismotectonics and seismicities between the Xi-aliaohe-Laizhouwan segment and the Weifang-Jiashan segment of the Tancheng-Lujiang Fault zone[J].NorthChina Earthquake Sciences,17(2):36—42(in Chinese).
陈洪洲,任锦章,徐亚勤.1996.依兰-伊通裂谷火山活动与地震活动[J].东北地震研究,12(1):8—18.CHEN Hong-zhou,REN Jin-zhang,XU Ya-qin.1996.Volcanism and seismicity along Yilan-Yitong rift valley zone[J].Seismological Research of Northeast China,12(1):8—18(in Chinese).
崔效锋,谢富仁,赵建涛.2005.中国及邻区震源机制解的分区特征[J].地震地质,27(2):298—307.CUI Xiao-feng,XIE Fu-ren,ZHAO Jian-tao.2005.The regional characteristics of focal mechanism solutions in Chinaand its adjacent areas[J].Seismology and Geology,27(2):298—307(in Chinese).
高常波,钟以章.2000.1999年辽宁海城-岫岩5.6级地震的地质构造背景和发震构造[J].地震地质,22(4):405—412.GAO Chang-bo,ZHONG Yi-zhang.2000.Geological background and seismogenic fault of the Haicheng-XiuyanM5.6earthquake of November29,1999[J].Seismology and Geology,22(4):405—412(in Chinese).
高祥林,罗焕炎,平原和郎.1996.日本俯冲带应力产生与传播的数值模拟[J].地震地质,16(2):97—108.GAO Xiang-lin,LUO Huan-yan,KAZURO Hirahara.1996.Numerical model of stress generation and transfer causedby the Japanese subduction zone[J].Seismology and Geology,16(2):97—108(in Chinese).
谷光裕,于龙伟,王安东,等.2001.辽宁岫岩5.4级地震临震预测[J].地震,21(1):78—84.GU Guang-yu,YU Long-wei,WANG An-dong,et al.2001.The imminent prediction for Xiuyan earthquake withMS5.4in Liaoning Province[J].Earthquake,21(1):78—84(in Chinese).
康力,刘志平,盘晓东,等.2001.吉林省中部地区现今构造活动及现代地壳应力场特征的探讨[J].东北地震研究,17(1):69—75.KANG Li,LIU Zhi-ping,PAN Xiao-dong,et al.2001.Research on the characteristics of contemporary crustal stressfield and recent tectonic activity in central area of Jilin Province[J].Seismological Research of Northeast China,17(1):69—75(in Chinese).
兰从欣,刘杰,马士振,等.2006.岫岩5.4级地震序列主应力变化特征研究[J].地震,26(2):73—82.LAN Cong-xin,LIU Jie,MAShi-zhen,et al.2006.Study on stress variation characteristics of Xiuyan5.4earthquakeseries[J].Earthquake,26(2):73—82(in Chinese).
李家灵,晁洪太,崔昭文,等.1994.郯庐活断层的分段及其大震危险性分析[J].地震地质,16(2):121—126.LI Jia-ling,CHAO Hong-tai,CUI Zhao-wen,et al.1994.Segmentation of active fault along the Tancheng-LujiangFault zone and evaluation of strong earthquake risk[J].Seismology and Geology,16(2):121—126(in Chi-nese).
林玉祥,卢良玉,张萍.2000.辽宁及邻区应力场模拟中远场应力的确定[J].东北地震研究,16(3):44—50.LINYu-xiang,LULiang-yu,ZHANG Ping.2000.Far-field stress determined in simulated stress field in Liaoning areaand its adjacency[J].Seismological Research of Northeast China,16(3):44—50(in Chinese).
刘东旺,夏瑞良,刘泽民,等.2006.郯庐断裂带安徽段现代地震活动及应力场特征[J].地质科学,42(2):278—290.LIU Dong-wang,XIA Rui-liang,LIUZe-min,et al.2006.Characteristics of recent seismicity and stress fields in An-hui sector of the Tanlu Fault zone[J].Chinese Journal of Geology,42(2):278—290(in Chinese).
吕政,张京辉,邵喜彬,等.2006.2006年3月31日吉林省前郭-乾安MS4.8地震序列[J].国际地震动态,10:27—32.L Zheng,ZHANG Jing-hui,SHAO Xi-bin,et al.2006.Qianguo-QiananMS4.8earthquake sequence on March31,2006in Jilin Province[J].Recent Developments in World Seismology,10:27—32(in Chinese).
马宏生,刘杰,张国民,等.2002.用应变积累释放模型研究中国大陆地块分区地震活动[J].地震学报,24(6):569—578.MAHong-sheng,LIUJie,ZHANG Guo-min,et al.2002.The seismicity research in the subregions of Chinese mainlandusing strain accumulating and releasing model[J].Acta Seismologica Sinica,24(6):569—578(in Chinese).
孟宪森,朱景春,孙文斌,等.1996.东北地区浅源中强震及深震与西太平洋板块俯冲[J].东北地震研究,12(2):12—23.MENG Xian-sen,ZHU Jing-chun,SUN Wen-bin,et al.1996.Shallow moderate and deep earthquake in northeastChina and western Pacific plate subduction[J].Seismological Research of Northeast China,12(2):12—23(inChinese).
牛雪,卢造勋,姜德录,等.2000.郯庐断裂北带地区主要构造单元壳幔结构特征与地震活动性[J].地震学报,22(2):145—150.NIU Xue,LUZao-xun,JIANG De-lu,et al.2000.Crustal-mantle structure and seismicity of the main structural unitsin the northern Tanlu Fault zone region[J].Acta Seismologica Sinica,22(2):145—150(in Chinese).
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