天山地震带强震活动特征
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摘要
利用周边国家天山地震目录、中国天山地震目录及USGS地震目录,对天山地震带强震活动的时、空分布特征进行了分析讨论。结果表明,在研究时段内,天山地震带的强震在空间分布上有西强东弱、西密东疏且在40°<φN<42°范围出现强震的空白区并存在特殊的易发震地区。强震在南、北天山之间有往复迁移的特征,并在迁移的过程中有单发—双发—群发,但未出现过单发迁移后出现群发的过程。在时间分布上有较明显的周期特征及南、北天山交替发生的特征。在强度上,7级以上地震主要沿天山构造带分布,而6级地震不但有沿天山分布的还有沿斜切天山带的次级构造分布的,且6级以上地震出现高频地区,集中在东经77°±1°的天山地区。
The Tienshan earthquake catalogue of peripheral countries,China and USGS were used to analyze the temporal and spatial distribution characteristics of strong earthquake activity in Tienshan seismic belt.The results showed the strong earthquake activity in Tienshan seismic belt appeared "powerful in the West and weak in the East","dense in the West and sparse in the East" in local area and there was a strong seismic gap in the 40°<φN<42°area and formed a latent earthquake region.The strong earthquakes migrated to and fro between north and south Tienshan and appeared single-double-cluster,never appeared "cluster" after migration of "single".There was obvious periodic characteristic or alternating between north and south Tienshan in time distribution.Most MS>7 earthquakes distributed along Tienshan structural belt,while MS>6 earthquakes distributed not only along Tienshan structural belt,but the secondary structure zone angle cutting Tienshan,and MS>6 earthquakes gathered in λE 77°±1°area of Tienshan.
The Tienshan earthquake catalogue of peripheral countries,China and USGS were used to analyze the temporal and spatial distribution characteristics of strong earthquake activity in Tienshan seismic belt.The results showed the strong earthquake activity in Tienshan seismic belt appeared "powerful in the West and weak in the East","dense in the West and sparse in the East" in local area and there was a strong seismic gap in the 40°<φN<42°area and formed a latent earthquake region.The strong earthquakes migrated to and fro between north and south Tienshan and appeared single-double-cluster,never appeared "cluster" after migration of "single".There was obvious periodic characteristic or alternating between north and south Tienshan in time distribution.Most MS>7 earthquakes distributed along Tienshan structural belt,while MS>6 earthquakes distributed not only along Tienshan structural belt,but the secondary structure zone angle cutting Tienshan,and MS>6 earthquakes gathered in λE 77°±1°area of Tienshan.
引文
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[4]陈杰,丁国瑜,Burbank D W,等.中国西南天山山前的晚新生代构造与地震活动[J].中国地震,2001,17(2):134-155.
[5]胥颐,刘福田,刘建华,等.天山地震带的地壳结构与强震构造环境[J].地球物理学报,2000,43(2):184-193.
[6]苏乃秦.试论全天山地震活动的韵律性[J].内陆地震,2000,4(1):9-14.
[7]薛艳,梅世蓉,宋治平.天山地块强震活动的时空特征研究[J].地震,2004,14(24):7-16.
[8]李锦轶,王克卓,李亚萍,等.天山山脉地貌特征、地壳组成与地质演化[J].2006,5(8):895-909.
[9]邓起东,冯先岳,张培震,等.天山活动构造[M].北京:地震出版社,2000.
[10]新疆维吾尔自治区地震局.天山地区地震目录[J].内陆地震,1997,11(增刊).
[11]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.
[12]冯锐,马宗晋,方剑,等.发展中的板块边界:天山—贝加尔活动构造带[J].地学前缘,2007,14(4):1-17.
[13]赵瑞斌,杨主恩,周新伟,等.天山南北两侧山前坳陷带中新生代构造特征与地震[J].地震地质,2000,22(3):295-304.
[14]王志刚,李林.中亚天山地区横向构造的航天遥感分析[J].环境遥感,1996,11(4):273-279.
[15]牛之俊,游新兆,杨少敏.利用GPS分析天山现今地壳形变特征[J].大地测量与地球动力学,2007,27(2):1-9.
[16]王晓强,李杰,王琪,等.天山现今地壳运动的形变场分析[J].大地测量与地球动力学,2005,25(3):63-68.
[17]王晓强,李杰,A lexander Zubovich,等.利用GPS形变资料研究天山及邻近地区地壳水平位移与应变特征[J].地震学报,2007,29(1):31-37.
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