选取全国具有显著年变周期的26个地电阻率台站,采用多元线性回归方法进行计算分析,结果显示,在多数台站的影响因素中,气温对地电阻率年变周期的影响占比最大,其次是地下水、气温和降雨量。通过傅里叶变换方法剔除年变周期影响,对部分仍与降雨量呈线性关系的数据进行去倾处理,所得地电阻率趋势异常与应力场变化有一定相关性。其中:距离相近台站之间的异常同步信息与多台广域性异常变化,均与应力场变化(或震情)密切相关;局域性异常变化能够反映该区中等地震异常信息,而广域性异常变化则与我国以东太平洋板块西北缘的俯冲活动有关。
A total of 26 ground resistivity stations with significant annual variation periods were selected and calculated by multiple linear regression. It is concluded that the influence of temperature on the annual period of ground resistivity is the largest among the meteorological factors of most stations, followed by groundwater, temperature, and rainfall. By using the Fourier method to eliminate the influence of the annual cycle, and then by removing some data that still have a linear relationship with rainfall, the obtained abnormal changes of ground resistivity can be well correlated with the changes of the stress field. Among them, the abnormal synchronization information between near stations and the abnormal changes of multiple stations in a wide area are related to the changes of the stress field (or earthquake situation). The local anomaly changes can reflect the moderate seismic anomaly signals in the area, while the wide anomaly changes are related to the subduction activities on the northwest margin of the eastern Pacific plate, so they are related to the occurrence of Japanese earthquakes.
2025,46(2): 173-184 收稿日期:2024-9-3
DOI:10.3969/j.issn.1003-3246.2025.02.020
基金项目:中国地震局地震监测、预报、科研三结合课题(项目编号:3JH-202402006);中国地震局地震科技星火计划青年项目(项目编号:XH15005Y);河北省地震科技星火计划项目(项目编号:DZ2021121400004);河北省地震科技星火计划项目(项目编号:DZ2025081900029)
作者简介:郭骄(1990—),女,工程师,主要从事地震监测工作。E-mail:624772008@qq.com
*通讯作者:郭建芳(1977—),女,高级工程师,主要从事地震监测和分析预报工作。E-mail:503543163@qq.com
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