华北地区重力场变化特征研究
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摘要
通过对1992~2008年间各期观测资料进行全时空扫描,分析华北地区网区重力场的演化特征,总结震前异常的形态、持续时间和变化幅度,指出重力场空间变化易于发生地震的部位,并对一些问题进行讨论。结果显示:华北地区重力场总体变化不具明确规律性;大量测点存在明显的背景性趋势性异常变化;重力场变化与网区及周边地区中强地震的活动联系密切,较明显的重力场异常反应多发生在震前2年左右时间,且常伴有大面积高值异常区出现。重力变化"0"线、高梯度带、异常中心(含极值)附近是重力场空间变化易于发震的部位。
This paper analyze the characteristics of gravity variations in the observed area in North China using space-time scan method on basis of gravity data from 1992 to 2008.The shape,duration and magnitude of anomaly before earthquakes are summarized,and the earthquake prone region in the spatial variation of gravity field is presented.The results show that the variation of gravity field has no obvious regularity;a lot of sites show clear tendency anomaly;the variation of gravity field is correlative closely with the earthquakes in and around the net,and most of the anomalies occur 2 years before the earthquakes;0 gradient line,high gradient zone and extreme center of gravity field are the earthquake prone region.
This paper analyze the characteristics of gravity variations in the observed area in North China using space-time scan method on basis of gravity data from 1992 to 2008.The shape,duration and magnitude of anomaly before earthquakes are summarized,and the earthquake prone region in the spatial variation of gravity field is presented.The results show that the variation of gravity field has no obvious regularity;a lot of sites show clear tendency anomaly;the variation of gravity field is correlative closely with the earthquakes in and around the net,and most of the anomalies occur 2 years before the earthquakes;0 gradient line,high gradient zone and extreme center of gravity field are the earthquake prone region.
引文
[1]赵晓燕,陈春生.重力观测测技术[M].北京:地震出版社,1997:134-192.
[2]张跃刚,胡新康.华北地区块体及其边界的相对运动[J].大地测量与地球动力学,2005,25(1):47-50.
[3]张跃刚,胡新康.华北地区地壳水平运动演化特征研究[J].大地测量与地球动力学,2004,24(1):56-62.
[4]张跃刚,帅平,胡新康,等.从GPS观测看华北地区的形变场演化[J].大地测量与地球动力学,2006,26(1):36-41.
[5]庞振兴,张传定,叶修松.Surfer8.0在重力异常数据格网化中的应用[J].海洋测绘.2008.28(1):43-46.
[6]罗兰格,韩渭宾,刘耀伟,等.强地震中短期预报方法及其效能研究[M].北京:地震出版社,2002:166-176;472-491.
[7]贾民育,邢灿飞,孙少安.滇西重力变化的二维图象及其与5级(Ms)以上地震的关系[J].地壳形变与地震,1995,15(3):9-19.
[8]孙少安,项爱民,李辉.滇西和北京区域重力场演化及其与地震关系的探讨[J].地震,1999,19(1):97-106.
[9]苏树朋,张纳莉,李非,等.文安5.1级地震前的重力场变化[J].华北地震科学,2008,26(2):45-48.
[10]张健朝.天山地区流动重力重复测量资料前兆异常识别判断据、地震预报指标及效能评价[J].内陆地震,2002,16(4):306-316.
[11]孙铭心,刘善华,杨怀宁.河北文安5.1级地震前的重力变化[J].大地测量与地球动力学,2008,28(2):16-21.
[2]张跃刚,胡新康.华北地区块体及其边界的相对运动[J].大地测量与地球动力学,2005,25(1):47-50.
[3]张跃刚,胡新康.华北地区地壳水平运动演化特征研究[J].大地测量与地球动力学,2004,24(1):56-62.
[4]张跃刚,帅平,胡新康,等.从GPS观测看华北地区的形变场演化[J].大地测量与地球动力学,2006,26(1):36-41.
[5]庞振兴,张传定,叶修松.Surfer8.0在重力异常数据格网化中的应用[J].海洋测绘.2008.28(1):43-46.
[6]罗兰格,韩渭宾,刘耀伟,等.强地震中短期预报方法及其效能研究[M].北京:地震出版社,2002:166-176;472-491.
[7]贾民育,邢灿飞,孙少安.滇西重力变化的二维图象及其与5级(Ms)以上地震的关系[J].地壳形变与地震,1995,15(3):9-19.
[8]孙少安,项爱民,李辉.滇西和北京区域重力场演化及其与地震关系的探讨[J].地震,1999,19(1):97-106.
[9]苏树朋,张纳莉,李非,等.文安5.1级地震前的重力场变化[J].华北地震科学,2008,26(2):45-48.
[10]张健朝.天山地区流动重力重复测量资料前兆异常识别判断据、地震预报指标及效能评价[J].内陆地震,2002,16(4):306-316.
[11]孙铭心,刘善华,杨怀宁.河北文安5.1级地震前的重力变化[J].大地测量与地球动力学,2008,28(2):16-21.
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