地震研究

1998年张北6.2级地震前,山西、河北及其附近地区出现的定点形变、流体前兆异常,具有随时间推移从震区外围大范围区域向震区附近迁移、集中的趋势特性。通过构建异常信号传播函数,借助网格搜索—拟牛顿最小二乘法反演汇聚区域即推测可能的地震危险区,所得汇聚区域边缘距实际震中仅25～51 km、汇聚时刻与发震时刻仅差数天,且震前中短期阶段汇聚速度加快。

Precursory anomalies of deformation and fluid measured in fixed-point appear the trend features of moving and concentrating from distance areas to the near of seismic area before the Zhangbei M_S6.2 earthquake in 1998.Constructing abnormal signal spreading function,and using grid searching-quasi Newton least square method,we inverse the converged region of precursory anomalies which is the predicting possible risk region.The result shows that the distance between the margin of calculated converged region and the real epicenter is only 25-51 km.The difference between the converging time and the original time is only several days.Moreover,the converging rate speeds up at the middle-short term before Zhangbei M_S6.2 earthquake.

引言
1 信号传播模型构建与反演方法
2 张北震前实测资料反演分析
3 结论与讨论

图1 张北震前河北—山西及其附近异常台站分布及模拟汇聚区1、2的位置<br/>Fig.1 Distribution of abnormity stations and location of No.1 and No.2 inverted converged regions in and near Hebei-Shanxi before the Zhangbei earthquake

图1 张北震前河北—山西及其附近异常台站分布及模拟汇聚区1、2的位置
Fig.1 Distribution of abnormity stations and location of No.1 and No.2 inverted converged regions in and near Hebei-Shanxi before the Zhangbei earthquake

表1 反演所得汇聚区1传播函数参量<br/>Tab.1 Inverted parameters of spreading function for No.1 converged region

表1 反演所得汇聚区1传播函数参量
Tab.1 Inverted parameters of spreading function for No.1 converged region

表2 反演所得汇聚区2传播函数参量<br/>Tab.2 Inverted parameters of spreading function for No.2 converged region

表2 反演所得汇聚区2传播函数参量
Tab.2 Inverted parameters of spreading function for No.2 converged region

表3 反演所得汇聚区3传播函数参量<br/>Tab.3 Inverted parameters of spreading function for No.3 converged region

表3 反演所得汇聚区3传播函数参量
Tab.3 Inverted parameters of spreading function for No.3 converged region

图2 张北震前河北及其附近定点形变异常分布及模拟汇聚区3的位置<br/>Fig.2 Distribution of deformation abnormity stations and location of No.3 inverted converged regions in and near Hebei before the Zhangbei earthquake

图2 张北震前河北及其附近定点形变异常分布及模拟汇聚区3的位置
Fig.2 Distribution of deformation abnormity stations and location of No.3 inverted converged regions in and near Hebei before the Zhangbei earthquake

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备注

引言

1 信号传播模型构建与反演方法

2 张北震前实测资料反演分析

3 结论与讨论

期刊信息