1812年尼勒克地震的宏观震中位置研究
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摘要
微观震中是震源在地表的投影,宏观震中是极震区的几何中心,不同的定义造成位置的差异,大地震的差异比较大,断裂产状也是导致震中位置差异的主要影响因素。据历史记载确定的1812年地震的宏观震中,侧重人居环境,震中位置偏西,初步考察受条件限制也存在一定误差。近年的研究取得了新进展,在尼勒克谷地东部新发现了该地震造成的地质灾害,包括了40 km的形变带,19km的地震断层。根据修正的等震线图,极震区的几何中心在北纬43°45,′东经83°34′。
The microcosmic-epicenter is the ground projection of focus,and macro-epicenter is the geometric center of the meizoseismal region.The different definitions result in the difference of position.The difference of large earthquake is bigger and the faults' occurrences are main influence factor of this difference.The macro-epicenter of 1812 earthquake,based on the historical record,emphasizes particularly on residing environment and is leaning to the west.The existing errors can also be attributed to the limit of the initial investigation condition.In recent years,some new progress has been made.In the east of Nilka valley,the geological disasters phenomenon caused by the 1812 earthquake is discovered newly.It includes 40km deformation zone and 19 km earthquake faults.According to the revised isoseismal map,the geometric center of the meizoseismal region is located at N43°45′,E83°34′.
The microcosmic-epicenter is the ground projection of focus,and macro-epicenter is the geometric center of the meizoseismal region.The different definitions result in the difference of position.The difference of large earthquake is bigger and the faults' occurrences are main influence factor of this difference.The macro-epicenter of 1812 earthquake,based on the historical record,emphasizes particularly on residing environment and is leaning to the west.The existing errors can also be attributed to the limit of the initial investigation condition.In recent years,some new progress has been made.In the east of Nilka valley,the geological disasters phenomenon caused by the 1812 earthquake is discovered newly.It includes 40km deformation zone and 19 km earthquake faults.According to the revised isoseismal map,the geometric center of the meizoseismal region is located at N43°45′,E83°34′.
引文
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[3]张培震,徐锡伟,闻学泽,等.2008年汶川8.0级地震发震断裂的滑动速率、复发周期和构造成因[J].地球物理学报,2008,51(4):1 066-1 073.
[4]尹光华,沈军,蒋靖祥,等.2001年11月14日东昆仑8.1级地震的构造背景[J].干旱区地理,2002,25(1):24-29.
[5]徐锡伟,陈文彬,于贵华,等.2001年11月14日昆仑山库赛湖地震(MS8.1)地表破裂带的基本特征[J].地震地质,2002,24(1):1-13.
[6]杨章,陈祥玉,尹光华,等.1812年3月8日新疆尼勒克8级大震[J].西北地震学报,1985,7(1):59-65.
[7]冯先岳.新疆尼勒克地震断层带[J].内陆地震,1990,4(3):273-277.
[8]冯先岳.新疆古地震[M].乌鲁木齐:新疆科技卫生出版社,1997.
[9]尹光华,蒋靖祥,裴宏达.1812年尼勒克地震断层及最大位移[J].内陆地震,2006,20(4):296-304.
[10]杨章,张勇,李军,等.对1812年3月8日新疆尼勒克8级地震发震构造初探[J].地震学报,1985,7(4):434-444.
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