新疆地区M≥7.7地震震源特征研究
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摘要
对1900年以来新疆地区4次M≥7.7大震序列类型、发震构造与震源特征、大震孕震阶段地震活动图像的动态演化特征等进行了分析,探讨了几次大震震源特征。结果表明,大震序列类型具有多样性,包括主-余型、双震型和孤立型;大震震源断错性质基本上反映了天山和阿尔泰构造带分别以逆冲和走滑为主的构造运动特性;大震孕震阶段地震活动图像演化特征明显,中长期阶段新疆地区6级地震活跃,中期阶段相对平静,短期阶段有差异,大震后新疆处于显著平静状态;不同震级的地震活动均反映出明显的由西南向北东迁移规律,表明新疆地区强震活动的主要动力源来自于印度板块向北的推挤作用。
We analyse the type of earthquake sequence,seismogenic tectonic and focal signatures,and dynamic evolution characteristics of seismic pattern in the period of earthquake preparation with strong MS≥7.7 earthquake in Xinjiang and its adjacent areas.In the meantime,we make comprehensive study of the focal characteristics of strong earthquakes.The preliminary results show that the strong earthquake sequences are diverse,including main-after shock type,isolated type and double earthquake type.The rupture characteristics of strong earthquakes basically reflect the tectonic movement characteristics of the Tianshan tectonic belt,which is mainly thrust behavior,while Altay tectonic belt is mainly strike-slip.The evolution characteristic of seismic pattern is obvious in the stage of earthquake preparation.During long and medial period MS6.0 earthquakes are active,in the medium-term earthquakes are relatively quiet and activity of earthquakes differ in the short-term.The seismic activity of Xinjiang is significantly quiet after strong earthquakes,the activity in different sizes all reflects the migration regularity that is from southwest to northeast.The main power source of strong earthquakes in Xinjiang comes from the northward pushing of the Indian plate.
We analyse the type of earthquake sequence,seismogenic tectonic and focal signatures,and dynamic evolution characteristics of seismic pattern in the period of earthquake preparation with strong MS≥7.7 earthquake in Xinjiang and its adjacent areas.In the meantime,we make comprehensive study of the focal characteristics of strong earthquakes.The preliminary results show that the strong earthquake sequences are diverse,including main-after shock type,isolated type and double earthquake type.The rupture characteristics of strong earthquakes basically reflect the tectonic movement characteristics of the Tianshan tectonic belt,which is mainly thrust behavior,while Altay tectonic belt is mainly strike-slip.The evolution characteristic of seismic pattern is obvious in the stage of earthquake preparation.During long and medial period MS6.0 earthquakes are active,in the medium-term earthquakes are relatively quiet and activity of earthquakes differ in the short-term.The seismic activity of Xinjiang is significantly quiet after strong earthquakes,the activity in different sizes all reflects the migration regularity that is from southwest to northeast.The main power source of strong earthquakes in Xinjiang comes from the northward pushing of the Indian plate.
引文
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[3]张培震,邓起东,张国民,等.中国大陆的强震活动与活动地块.中国科学(D辑),2003,33(增刊):12-20.
[4]新疆地震局.富蕴地震断裂带[M].北京:地震出版社,1985.
[5]赵瑞斌,沈军,李军.1902年新疆阿图什8级地震形变特征与发震模式初探[J].地震地质,2001,23(4):493-500.
[6]张培震,邓起东,徐锡伟,等.盲断裂、褶皱地震与新疆1906年玛纳斯地震[J].地震地质,1994,16(3):193-204.
[7]周伟新,杨主恩,孙君秀,等.1906年玛纳斯7.7级地震孕震过程的数值模拟研究[J].地震地质,2003,25(4):509-616.
[8]张国民,钮凤林,邵志刚,等.中国大陆MS≥7.8大震的余震活动差异性特征及其成因研究[J].地震,2010,30(4):1-12.
[9]梅世蓉,薛艳,宋治平.汶川8.0级与昆仑山口西8.1级地震前地震活动异常特征与启示[J].地震,2009,29(1):1-12.
[10]梅世蓉,宋治平,薛艳.中国巨大地震前地震活动环形分布图像与规律[J].地震学报,1996,18(4):413-419.
[11]薛艳,刘杰,梅世蓉,等.2008年汶川MS8.0地震前地震活动异常特征[J].地震学报,2009,31(6):606-619.
[12]王海涛,李莹甄,屠泓为.新疆历史地震目录完整性分析[J].内陆地震,2006,20(1):10-17.
[13]国家地震局预测预防司.测震学分析预报反方法[M].北京:地震出版社,1997.
[14]蒋海昆,曲延军,李永莉,等.中国大陆中强地震余震序列的部分统计特征[J].地球物理学报,2006,49(4):1 110-1 117.
[15]傅征祥.大地震的强余震活动持续时间和重复时间[J].地震地质,1990,12(1):15-20.
[16]刘蒲雄,陈修启,吕晓健,等.地震序列的后续显著地震的预测研究[J].地震学报,1996,18(1):27-33.
[17]高国英,温和平.帕米尔东北侧现代构造应力场与地震活动特征研究[J].中国地震,2000,16(2):176-181.
[18]柔洁,宋和平,娄少平,等.俄、中、蒙交界7.9级地震[J].国际地震动态,2004,304(4):16-19.
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