近几年山西断裂带水平形变的初步分析
|
摘要
以沿山西断裂带布设的GPS监测网的6期复测资料(1999~2004)所计算的近期趋势性运动速率为基础,获得了2005、2006年山西断裂带相对于近期趋势性运动的偏离结果。结果显示:(1)趋势性差异运动信息不显著,运动信息明显的点数只占十分之一,它们分别是S21、S20、S30和S33(位于太原以南),量级最大约6mm/a;(2)尽管单站趋势性运动信息不显著,但整体模拟计算表明,1999~2004年似乎有南北相对运动的迹象,相对变化最大约2.0mm/a;(3)2005年有偏离趋势运动的迹象,且背离趋势运动方向,最大量级约7mm;(4)截至2006年的累计偏离量最大约6mm;这表明2006年基本未发生累计偏离。由于变化相对平稳,这可能预示着山西断裂带内近期地震活动强度不太可能明显提高。
The movement that Shanxi rift zone departures from its tendency in recent years is calculated with the data in 6 observations(1999～2004) in the GPS monitoring network along Shanxi rift zone.The results show that,(1) as the differential sites accounted for only 1/10,which was S21,S20,S30 and S33 site respectively,the differential movement with maximum of 6mm/a was not notable;(2) the whole rift zone had a sign to move in south and north direction,with a rate about 2.0 mm/a;(3) the departure movement in 2005 was obvious,which its largest velocity is about 7 mm;(4)The accumulative departure in 2006 is about 6mm,it indicates there is almost no deviation in 2006.As the variation is comparatively steady,the recent level of seismic activity in the zone may not be high.
The movement that Shanxi rift zone departures from its tendency in recent years is calculated with the data in 6 observations(1999～2004) in the GPS monitoring network along Shanxi rift zone.The results show that,(1) as the differential sites accounted for only 1/10,which was S21,S20,S30 and S33 site respectively,the differential movement with maximum of 6mm/a was not notable;(2) the whole rift zone had a sign to move in south and north direction,with a rate about 2.0 mm/a;(3) the departure movement in 2005 was obvious,which its largest velocity is about 7 mm;(4)The accumulative departure in 2006 is about 6mm,it indicates there is almost no deviation in 2006.As the variation is comparatively steady,the recent level of seismic activity in the zone may not be high.
引文
[1]王秀文.山西中强地震前形变前兆的异常特征[J].山西地震,1995,(2):3-8.
[2]杨国华,巩曰沐,杨春花.大同地震与华北北部地壳异态垂直运动[J].中国地震,1994,10(1):13-18.
[3]杨国华,赵承坤,韩月萍,等.应用GPS技术监测山西断裂带的水平运动[J].地震学报,2000,22(5):465-471.
[4]韩月萍,杨国华,马庆尊.首都圈及山西断陷带北部地壳垂直形变与地震危险性分析[J].华北地震科学,2003,21(3):8-13.
[5]李延兴,李智,张静华,等.中国大陆及周边地区的水平应变场[J].地球物理学报,2004,47(2):222-231.
[6]杨国华,江在森,刘峡,等.华北地区水平运动动态特征与昆仑山地震的可能关系[J].大地测量与地球动力学,2007,27(1):6-10.
[2]杨国华,巩曰沐,杨春花.大同地震与华北北部地壳异态垂直运动[J].中国地震,1994,10(1):13-18.
[3]杨国华,赵承坤,韩月萍,等.应用GPS技术监测山西断裂带的水平运动[J].地震学报,2000,22(5):465-471.
[4]韩月萍,杨国华,马庆尊.首都圈及山西断陷带北部地壳垂直形变与地震危险性分析[J].华北地震科学,2003,21(3):8-13.
[5]李延兴,李智,张静华,等.中国大陆及周边地区的水平应变场[J].地球物理学报,2004,47(2):222-231.
[6]杨国华,江在森,刘峡,等.华北地区水平运动动态特征与昆仑山地震的可能关系[J].大地测量与地球动力学,2007,27(1):6-10.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心