几次中强震前龙岩台地倾斜异常特征分析  

FEATURE ANALYSIS OF LONGYAN SEISMIC STATION CRUSTAL TILT ANOMALY BEFORE SEVERAL STRONG EARTHQUAKES

作　　者：郑永通[1] 张年明[1] 杨佩琴[1] 刘其寿[1] 郑建志[1] 全建军[2] ZHENG Yong-tong1 ,ZHANG Nian-ming1 ,YANG Pei-qin1, LIU Qi-shou1, ZHENG Jian-zhi1, QUAN Jian-jun2(1. Longyan Seismostation,Fujian Earthquake Agency, Longyan 364000, Fujian, China; 2. Yongan Seismostation,Fujian Earthquake Agency, Yongan 353000, Fujian, China)

机构地区：[1]福建省地震局龙岩地震台,福建龙岩364000 [2]福建省地震局永安地震台,福建永安366000

出　　处：《内陆地震》2018年第2期172-178,共7页Inland Earthquake

摘　　要：龙岩台垂直摆倾斜仪受降雨干扰严重,EW分量与降雨量累积值之间存在很强的正相关,利用一元线性回归的方法对降雨干扰进行了剔除。通过对2007~2015年发生在福建内陆的几次ML≥4.5地震震前的残差值曲线进行分析,结果表明,中强震前残差值曲线一般会出现几天至十几天的急剧下降或快速上升过程,多数地震在该异常过程结束后一个月内发震。The observation results showed that EW component of vertical pendulum tilt meter in Longyan station was influenced seriously by the rainfall,which had a strong correlation with cumulative rainfall values. The monadic linear regression method was used to exclude the rainfall quantitative interference. By analyzing the residual value curve of several ML≥4. 5 earthquakes in the inland of Fujian in the past years from 2007 to 2015. The results showed that the seismic anomaly characteristics of the vertical pendulum tiltmeter fell sharply or increased rapidly before earthquakes,which were last a few days to 10 days. Most of earthquakes were occurred within one month after the end of the abnormal characteristic.

关 键 词：龙岩台 地倾斜 降雨剔除 中强震 异常特征 

分 类 号：P315.7[天文地球—地震学]