地震研究

汶川8.0级地震后,根据中国地震局和四川省地震局的安排,四川省地震局测绘工程院完成了龙门山断裂带及附近的5个跨断层短水准测点的应急观测任务,其中双河是汶川地震后复测次数最多的场地。通过对双河跨断层短水准应急观测资料的分析,提取汶川余震监视期内出现的异常情况及与中强余震的关系进行讨论,为今后强余震的预报总结经验。分析结果认为:双河跨断层短水准定点观测反映了强震发生后断层的蠕滑特性,较好地描述了中强余震发生前跨断层垂直形变异常形态,为余震的监测预报积累了一些经验。

After the Wenchuan 8.0 earthquake,in accordance with national and provincial seismological bureau arrangement,Sichuan Seismological Bureau of Surveying and Mapping Engineering Institute and the completion of the Longmen Shan fault zone near the 5 cross-fault standard of measurement points short of emergency observation tasks,in which pairs of River is measured again after the earthquake the highest number of venues.This will be short on cross-fault standard of emergency Shuanghe observation data analysis,extraction monitoring aftershocks in Wenchuan anomalies that have emerged during the period and with the discussion of the relationship between strong aftershocks,aftershocks of the forecast for future lessons learned.Analysis concluded that:Shuanghe cross-fault short observation reflects the level of fixed-point after the earthquake fault creep characteristics,better describes the occurrence of strong aftershocks in the vertical fault deformation anomaly before the cross-shape,as the aftershocks have accumulated some experience in monitoring and forecasting.

引言
1 双河场地概况
2 汶川地震前后资料情况
3 双河短水准应急观测资料与汶川8.0级地震强余震监视
4 结论与认识

图1 双河短水准观测场地布设图<br/>Fig.1 The distribution of the short-line leveling points at Shuanghe site

图1 双河短水准观测场地布设图
Fig.1 The distribution of the short-line leveling points at Shuanghe site

图2 双河短水准汶川8.0级地震前后观测曲线图<br/>Fig.2 The observation curves of short-line leveling pre and after the MS8.0 Wenchuan Earthquake at Shuanghe site

图2 双河短水准汶川8.0级地震前后观测曲线图
Fig.2 The observation curves of short-line leveling pre and after the MS8.0 Wenchuan Earthquake at Shuanghe site

图3 双河短水准汶川8.0级震后应急定点观测曲线图<br/>Fig.3 The emergency observation curves of short-line leveling after the MS8.0 Wenchuan Earthquake at Shuanghe site

图3 双河短水准汶川8.0级震后应急定点观测曲线图
Fig.3 The emergency observation curves of short-line leveling after the MS8.0 Wenchuan Earthquake at Shuanghe site

表1 双河跨断层短水准定点观测异常情况统计表<br/>Tab.1 The observational abnormal cases at Shuanghe cross-fault short-line leveling site

表1 双河跨断层短水准定点观测异常情况统计表
Tab.1 The observational abnormal cases at Shuanghe cross-fault short-line leveling site

图4 双河短水准12汶川8.0级震后应急观测变化曲线<br/>Fig.4 The variation of the emergency observation curves in Shuanghe short-range leveling site after the Wenchuan MS8.0 Earthquake

图4 双河短水准12汶川8.0级震后应急观测变化曲线
Fig.4 The variation of the emergency observation curves in Shuanghe short-range leveling site after the Wenchuan MS8.0 Earthquake

表2 双河跨断层短水准应急观测异常情况统计表<br/>Tab.2 The emergency observational abnormal cases at Shuanghe cross-fault short-line leveling site

表2 双河跨断层短水准应急观测异常情况统计表
Tab.2 The emergency observational abnormal cases at Shuanghe cross-fault short-line leveling site

皇甫岗,李忠华,秦嘉政,等.2007.川滇菱形块体强震活动关联分析[J].地震研究,30(3):205-209.
李杰,赵金花.2001.苍山5.2级地震前后沂沐断裂带地壳垂直形变时空动态演化特征[J].地震研究,24(4):307-314.
刘玉权,彭兴宽,黄震民.1988.通海地震震后地形变研究[J].地震研究,21(4):369-376.
苏琴,朱航,杨永林.2009.耿达短水准异常与汶川8.0级地震[J].大地形变测量与地震动力学,29(增刊):103-105.
徐锡伟,闻学泽,叶建青.2008.汶川MS8.0地震地表破裂带及其发震构造[J].地震地质,(3):597-629.
张永久,乔慧珍,程万正,等.2007.四川盆地区域介质衰减特征研究[J].地震研究,30(1):43-47.
周如品,李昌芝,王雅杰.1986.川西大地形变测量网点布设图集[G].四川省地震局地震测量队,141-142.

备注

引言

1 双河场地概况

2 汶川地震前后资料情况

3 双河短水准应急观测资料与汶川8.0级地震强余震监视

4 结论与认识

期刊信息