宁波地震台动水位与垂直摆对汶川8.0级地震的同震变化  

Wenchan Ms8.0 Earthquake Coseismic Effects in ZK03 Well and VS Vertical Pendulum Tiltmeter of Ningbo Seismic Station

作　　者：邱永平[1,2] 

机构地区：[1]浙江省宁波地震台,浙江宁波315029 [2]宁波市地震监测预报中心,浙江宁波315016

出　　处：《华北地震科学》2009年第1期30-33,共4页North China Earthquake Sciences

基　　金：中国地震局95-01-02改造项目

摘　　要：分析认为宁波台ZK03井动水位、VS垂直摆倾斜仪出现的异常可能是汶川8.0级地震的同震变化现象。动水位表现为水震波引起的脉冲和阶跃变化并抬高水位12mm左右。垂直摆表现为形变波引起的脉冲和阶跃变化,EW向最大幅度约为339.9286×10-3〃的脉冲式向E振荡波,并向W出现阶跃变化,震前34小时还出现了一个向E阶跃;NS向最大幅度约为275.2411×10-3〃的脉冲式向N振荡波,并产生向S阶跃变化。对比分析结果说明,该台因有干扰因素少、正常波动背景值噪声限低的优势,观测效果比较理想。Step and pulse changes caused by water level vibration have been observed in ZK03 well of Ningbo seismic station. Similar changes caused by deformation waves are also observed in VS vertical pendulum tiltmeter of Ningbo seismic station. According to our analysis these changes may be the coseismic effects of Wenchan Ms8.0 earthquake. Rise of dynamic water level in the ZK03 well is about 12ram. Eastward pulse type oscillatory waves are observed at EW component of the VS vertical pendulum tihmeter with westward step, the maximum amplitude of the pulse is about 339. 9286 ×10^-3 . Southward pulse type oscillatory waves are observed at NS component with westward step,the maximum amplitude of the pulse is about 275.2411 × 10^-3 Comparative analysis indicates that the observation data of Ningbo seismic station has the advantages of low background, high signal - to- noise ratio.

关 键 词：汶川8.0级地震 动水位 垂直摆 同震变化 宁波地震台 

分 类 号：P315.72[天文地球—地震学]