张北6.2级地震前断层活动特征研究
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摘要
运用变化率分析了张北6.2级地震前山西地区跨断层流动短水准资料变化特征,发现:在张北6.2级地震孕育过程中,特别是地震孕育中短期阶段,断层活动存在明显的异常变化且一致性好,主要表现为:①断层异常活动集中在震前3.5～0.5年且存在阶段性,断层异常恢复后发生地震;②断层异常活动性质发生剧烈快速的变化,离地震发生越近断层异常活动幅度越大、变化率越快;③山西地区跨断层流动水准异常特别是前中短期异常变化主要集中在山西带的北部地区,范围主要集中在震中周围500km左右范围内。
In this paper,the mobile cross-fault short level data before Zhangbei 6.2 earthquake in Shanxi Province is analyzed;the results indicate that there are obvious fault activity anomalies during the preparation period of Zhangbei 6.2 earthquake,especially in the medium and short term period of the earthquake preparation.These anomalies are consistent with each other and have following characteristics.(1)The fault activity anomalies are concentrated in 0.5-3.5 years just before the earthquakes.(2)The amplitude of the anomalies become bigger as the origin time comes near.(3)Shanxi abnormal cross-fault current levels,especially in the short-term anomalies before earthquakes mainly concentrated in Shanxi Province with the northern region,mainly in the range of about 500km range around the epicenter.
In this paper,the mobile cross-fault short level data before Zhangbei 6.2 earthquake in Shanxi Province is analyzed;the results indicate that there are obvious fault activity anomalies during the preparation period of Zhangbei 6.2 earthquake,especially in the medium and short term period of the earthquake preparation.These anomalies are consistent with each other and have following characteristics.(1)The fault activity anomalies are concentrated in 0.5-3.5 years just before the earthquakes.(2)The amplitude of the anomalies become bigger as the origin time comes near.(3)Shanxi abnormal cross-fault current levels,especially in the short-term anomalies before earthquakes mainly concentrated in Shanxi Province with the northern region,mainly in the range of about 500km range around the epicenter.
引文
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[2]陈光,李祖宁,林志彬,等.福建地区跨断层场地特征研究[J].华北地震科学,2011,(3):52-56.
[3]张国民,马丽,高旭,等.大同一阳高地震研究[M].北京:地震出版社,1993:142-167.
[4]张国民,陈建民,李志雄,等.一九九八年张北地震[M].北京:地震出版社,1999:62-98.
[5]王秀文,赵丽华.山西及邻区中强地震前断层形变特征及预报指标研究[J].中国地震,2002,18(1):102-111.
[6]车兆宏,范燕,马牧军.华北地区震前断层异常活动方式[J].地震,2004,24(2):109-118.
[7]陆明勇,牛安福,陈兵,等.地下水位短临异常演化特征及其与地震关系的研究[J].中国地震,2005,21(2):269-279.
[8]陆明勇.地壳形变与地下水相互作用及“双力源”前兆观点[J].大地测量与地球动力学,2006,26(1):76-83.
[9]王秀文,宋美琴,李媛媛,等.形变观测预报地震模式的探讨[J].山西地震,2007,3:1-6.
[10]陈阜超,纪静,塔拉,等.京津水准复测与垂直形变特征[J].华北地震科学,2011,(2):31-34.
[11]山西省地震局.山西省地震监测志[M].北京:地震出版社,2006:504-520.
[12]陆明勇,房宗绯,赵丽葵.汶川8.0级地震前地下流体长趋势变化特征讨论[J].地震,2010,30(1):61-72.
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