玉门、民乐等地震前跨断层形变异常及与定点前兆观测的相互印证
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摘要
2002年甘肃玉门5.9级、2003年民乐6.1、5.8级及岷县5.2级地震前震区周围十几至二、三百公里范围内观测到一定数量、明显的跨断层短水准形变异常,其异常形态以加速、突跳或尖点突跳为主,具中期背景或短期前兆意义,反映震前断裂出现先逆断增强后松弛的变化过程,在转折松弛时段易发生地震。其异常空间分布、出现时间等与定点前兆异常具有较好的相互印证意义。
A certain number and significant across-fault short leveling deformation anomaly were observed in the source region around a dozen hundred km range before Yumen MS5.9 earthquake in 2002,Minle MS6.1 and MS5.8 earthquakes in 2003 and Minxian MS5.2 earthquake in 2003.The main abnormal morphology were acceleration,sudden jump or sharp point sudden jump,with mid-term background or short-term precursors significant.Anomalies reflect that the fault first enhanced inverse then changed to relaxation,earthquakes usually happened when the fault change relaxation.The spatial distribution and occurrence time of anomaly have added and confirmed significance to precursor anomalies of fixed-points.
A certain number and significant across-fault short leveling deformation anomaly were observed in the source region around a dozen hundred km range before Yumen MS5.9 earthquake in 2002,Minle MS6.1 and MS5.8 earthquakes in 2003 and Minxian MS5.2 earthquake in 2003.The main abnormal morphology were acceleration,sudden jump or sharp point sudden jump,with mid-term background or short-term precursors significant.Anomalies reflect that the fault first enhanced inverse then changed to relaxation,earthquakes usually happened when the fault change relaxation.The spatial distribution and occurrence time of anomaly have added and confirmed significance to precursor anomalies of fixed-points.
引文
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[2]江在森,祝意青,王庆良,等.永登5.8级地震孕育发生过程中的断层形变与重力场动态图象特征[J].地震学报,1998,20(3):264-271.
[3]王双绪,江在森,陈文胜,等.景泰5.9级地震的断层形变异常及中短期预报[J].地震学报,2001,23(2):151-158.
[4]车兆宏,刘善华,刘天海,等.用流动形变观测判定强震危险地点的研究[J].地壳形变与地震,1996,16(1):46-51.
[5]陈兵,江在森,赵振才.中国西部断层形变趋势异常特征与地震活动关系研究[J].中国地震,2000,16(1):77-85.
[6]张希,王双绪,崔笃信,等.民乐—山丹地震的区域构造变形背景与中短期前兆[J].中国地震,2004,20(3):238-246.
[7]吴富春,许俊奇,张宪,等.中国地震台网前兆异常的统计研究[J].地震学报,1998,20(5):515-520.
[8]张晓清,张晓香,秦松涛,等.短期前兆综合异常方法在青藏高原北部地区的应用——以兴海地震为例[J].西北地震学报,2008,30(2):179-183.
[9]徐辉,白亚平,康庆强,等.岷县5.2级地震前兆异常分析[J].高原地震,2007,19(3):25-28.
[10]张小涛,陈化然,马新欣,等.玉树MS7.1地震前地电场异常变化特征分析[J].大地测量与地球动力学,2011,31(增):38-42.
[11]张昱,张占斌,曹喜,等.嘉峪关气氡映震情况讨论及玉门地震前水氡(嘉峪关,酒泉)异常特征[J].地震地磁观测与研究,2004,25(1):78-82.
[12]刘耀炜.我国地震地下流体科学40年探索历程回顾[J].中国地震,2006,22(3):222-235.
[13]赵洁,杜学彬,胡建军,等.嘉峪关地电场观测资料分析[J].西北地震学报,2009,31(3):290-295.
[14]尹亮,李东生,周丽萍,等.民乐、山丹6.1级地震异常及台站实现短临预报的思考[J].西北地震学报,2005,27(增):112-116.
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