民乐-山丹6.1级地震前后的地壳垂直形变
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摘要
利用青藏块体东北部的区域水准、跨断裂水准和断层形变资料,分析了2003年10月25日民乐-山丹6.1级地震前后的地壳垂直形变。结果表明,震前出现了明显的长、中、短期形变前兆异常。在经历了1995~2000年的缓慢形变阶段后,2000~2002年祁连山断裂带中、西段形变显著加速,2003年3~10月断层形变异常数量经历了一个“少-多-少”的演变过程,并沿构造体自外围向震中附近收缩;震后祁连山断裂带中、西段形变反向,东段则出现局部隆起区。
Using observations of regional leveling, cross-faults leveling and fault deformation in the northern Qinghai-Tibet block, the vertical crust deformation before and after Minle-Shandan Ms6.1 earthquake on October 25, 2003 is analyzed. The results show that: there are obvious anomalous characteristics in long-medium-term and short-impending stage before earthquake;after slower deformation stage from 1995 to 2000, the deformation accelerated in middle and west part of Qilian fault zone from 2000 to 2002,the quantity of anomalies had gone through a evolutive process of “small-large-small” from March to October in 2003,and the fault deformation anomaly has the characteristic that it contracts from the outside to the source region.After the event there has been the contrary deformation in the middle and the west part of Qilian fault zone and a rise region appears in the east segment.
Using observations of regional leveling, cross-faults leveling and fault deformation in the northern Qinghai-Tibet block, the vertical crust deformation before and after Minle-Shandan Ms6.1 earthquake on October 25, 2003 is analyzed. The results show that: there are obvious anomalous characteristics in long-medium-term and short-impending stage before earthquake;after slower deformation stage from 1995 to 2000, the deformation accelerated in middle and west part of Qilian fault zone from 2000 to 2002,the quantity of anomalies had gone through a evolutive process of “small-large-small” from March to October in 2003,and the fault deformation anomaly has the characteristic that it contracts from the outside to the source region.After the event there has been the contrary deformation in the middle and the west part of Qilian fault zone and a rise region appears in the east segment.
引文
[1]甘肃省地震局.甘肃省地震局2000年年中震情趋势研究报告.2000.
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10 Zhang Sixin,Wang Shuangxu,Zhang Xi,et al.The ap-plication of leveling survey crossing fractures to earth-quake monitoring[J].Seismological and Geomagnetic Observation and Research,2005,26(4):22-28.(in Chinese)
11 周硕愚,韩键,宋永厚,等.断层网络系统前兆学原理与应用[J].地壳形变与地震,1990,10(1):1~12.
11 Zhou Shuoyu,Han Jian,Song Yonghou,et al.The ele-ments and application for the precursory signs of fault network system[J].Crustal Deformation and Earth-quake.1990,10(1):1-12.(in Chinese)
12 张国民.地震预报与震灾预测(讲座)[J].地震地磁观测与研究,1996,17(3):21~56.
12 Zhang Guomin.Earthuake and its disaster prediction[J].Seismological and Geomagnetic Observation and Research,1996,17(3):21-56.(in Chinese)
1 梅世蓉,等.一九七六年唐山地震[M].北京:地震出版社,1982.
1 Mei Shirong,et al.The Tangshan earthquake of1976[M].Beijing:Seismological Press,1982.(in Chinese)
2 张四新,江在森,王双绪,等.北祁连-河西地区垂直形变场演化与地震活动关系研究[J].地壳形变与地震,2001,21(2):70~76.
2 Zhang Sixin,Jiang Zaisen,Wang Shuangxu,et al.Study on evolution of the vertical deformationfield andits rela-tionship to seismic activityin QiLian mountain-HeXi cor-ridor[J].Crustal Deformation and Earthquake.2001,21(2):70-76.(in Chinese)
3 牛安福,张晶,张晓青,等.昆仑山口西8.1级地震前祁连山地震带附近形变异常的演化特征[J].地震,2003,23(4):21~26.
3 Niu Anfu,Zhang Jing,Zhang Xiaoqing,et al.Evolution characteristics of ground deformation observed along the QiLian Mt.Before the Kunlun MountainMs8.1earth-quake[J].Earthquake.2003,23(4):21-26.(in Chinese)
4 王双绪,等.昆仑8.1级地震前青藏块体东北缘构造运动特征[J].大地测量与地球动力学,2004,24(1):50~55.
4 Wang Shuangxu,et al.Features of horizontal movement in northeastern margin of Qinghai-Tibet block before Ms8.1Kunlun earthquake[J].Journal of Geodesy and Geodynamics,2004,24(1):50-55.(in Chinese)
5 张希,等.大姚、民乐-山丹地震前的中短期前兆[J].大地测量与地球动力学,2004,24(4):57~63.
5 Zhang Xi,et al.Medium and short-term precursors of fault deformation before Dayao and Minle-Shandanearthquake[J].Journal of Geodesy and Geodynamics,2004,24(4):57-63.(in Chinese)
6 祝意青,等.民乐6.1级、岷县5.2级地震前区域重力场变化[J].大地测量与地球动力学,2005,25(1):24~29.
6 Zhu Yiqing,et al.Variations of gravity field before Minle Ms6.1and MinxianMs5.2earthquake[J].Journal of Ge-odesy and Geodynamics,2005,25(1):24-29.(in Chi-nese)
7 金春华,等.昆仑山口西8.1级强震前宁夏的地倾斜异常[J].大地测量与地球动力学,2003,23(2):61~64.
7 Jin Chunhua,et al.Anomaly of ground tilt in Ningxia be-foreMs8.1strong earthquake in west to Kunlun moun-tain pass[J].Journal of Geodesy and Geodynamics,2003,23(2):61-64.(in Chinese)
8 张希,等.北祁连-河西地区强震地点预测[J].大地测量与地球动力学,2005,25(1):40~46.
8 Zhang Xi,et al.Prediction of place of strong earthquake in Northern Qilian-Hexi area[J].Journal of Geodesy and Geodynamics,2005,25(1):40-46.(in Chinese)
9 刘小凤,杨立命,范兵.昆仑山口西8.1级地震后青藏高原北部地区地震活动初步研究[J].西北地震学报,2003,25(1):52~58.
9 Liu Xiaofeng,Yang Li ming and Fan Bin.Preli minary study on seismic activity in the North of Qinghai-Tibet plateau after the Kunlun MountainMs8.1earthquake[J].Northwestern Seismological Journal,2003,25(1):52-58.(in Chinese)
10 张四新,王双绪,张希,等.跨断裂水准剖面观测在地震监测中的应用[J].地震地磁观测与研究,2005,26(4):22~28.
10 Zhang Sixin,Wang Shuangxu,Zhang Xi,et al.The ap-plication of leveling survey crossing fractures to earth-quake monitoring[J].Seismological and Geomagnetic Observation and Research,2005,26(4):22-28.(in Chinese)
11 周硕愚,韩键,宋永厚,等.断层网络系统前兆学原理与应用[J].地壳形变与地震,1990,10(1):1~12.
11 Zhou Shuoyu,Han Jian,Song Yonghou,et al.The ele-ments and application for the precursory signs of fault network system[J].Crustal Deformation and Earth-quake.1990,10(1):1-12.(in Chinese)
12 张国民.地震预报与震灾预测(讲座)[J].地震地磁观测与研究,1996,17(3):21~56.
12 Zhang Guomin.Earthuake and its disaster prediction[J].Seismological and Geomagnetic Observation and Research,1996,17(3):21-56.(in Chinese)
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