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1998年1月10日在首都圈西北边缘河北省西北部发生张北—尚义6.2级地震,震中位于北纬41.1度,东经114.3度。该地震是1976年唐山地震后发生在首都圈的最大地震,波及范围广,北京地区震感明显。震后对形变资料的分析表明,震前跨断层位移测量资料有较好的中期和短期异常显示。二、资料概况及异常判别本文选用首都圈及邻区(东经113°～120°,北纬38.5°～41°)共38处在测的断层位移测量台、点的观测资料,其中双基线水准点8处(万全测点于1997年4月停测),单基线水准点3处,水准测点21处,水准台站6处(有四处测点配有连续自记断层活动测量仪)。观测周期各不相同,基线、水准测量多数每月观测一次;部分测点(主要是山
On January 10, 1998, a Zhangbei-Shangyi 6.2 earthquake occurred in the northwestern part of Hebei Province at the northwest edge of the metropolitan area. The epicenter was located at 41.1 degrees north latitude and 114.3 degrees east longitude. This earthquake was the largest earthquake that occurred in the metropolitan area after the Tangshan earthquake in 1976, covering a wide range. The earthquake in Beijing is obvious. The analysis of the deformation data after the earthquake shows that there is a good medium-term and short-term anomalies in the data of the cross-fault displacement measurement before the earthquake. Data Overview and Abnormality Discrimination In this paper, we selected a total of 38 measured displacement measuring stations and points in the metropolitan area and its adjacent areas (longitude 113 ° ~ 120 ° east longitude and 38.5 ° ~ 41 ° north latitude), in which the double-baseline leveling point 8 stations (Wanquan test point was stopped in April 1997), 3 single baseline leveling points, 21 leveling points and 6 leveling stations (there are four measuring points equipped with continuous self-bearing fault activity measuring instrument). The observation cycle varies from baseline to level and most of them are observed monthly; some of the points (mainly mountain