福建地区流体对2007年4次4级地震映震特征分析
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摘要
通过对2007年福建地区4次4级地震的震例分析,认为福建地区流体对内陆中等地震具有如下映震特征:①地震前兆表现为不同测项在时间上呈有规律的层次发展且均以短临、临震和短期异常为主;②模拟观测井孔的映震效能好于数字化观测井孔,其中水氡、水质是福建地区的特征灵敏组分;③温泉井孔的映震效能好于普通井孔;④异常台项数取决于震级和震中周围的观测点数目。同时指出今后要根据区域特征,有重点地加大映震灵敏井孔和灵敏组分的观测、科学布网、合理建点,使各种前兆观测成场成网;建立一批符合地震监测预报要求的高质量水观测点,更有效地为地震分析预报服务。
We draw a conclusion that the subsurface fluid in Fujian region has the following earthquake-reflecting characteristics based on the analysis of 4 earthquakes with magnitude 4.0 happened in 2007.That is,the seismic precursors have a regular and hiberarchy development in different observed items and they always perform well in short-impending,imminent and short term anomalies.The analogue observation wells′ earthquake-reflecting ability is better than the digital wells′,water radon and the hydrochemistry are the especially sensitive observation items in Fujian region.The hotsprings′ earthquake-reflecting ability is better than the common ones′.The number of observation anomalies are decided by the number of observe stations around the epicenter.Also we point out that in order to serve the earthquake forecast better,we must construct a group of high quality water observational stations,which are able to meet the requirement of earthquake forecast so as to make all precursor observational stations to form a field or a net,strengthening the most sensitive wells and sensitive observational components.
We draw a conclusion that the subsurface fluid in Fujian region has the following earthquake-reflecting characteristics based on the analysis of 4 earthquakes with magnitude 4.0 happened in 2007.That is,the seismic precursors have a regular and hiberarchy development in different observed items and they always perform well in short-impending,imminent and short term anomalies.The analogue observation wells′ earthquake-reflecting ability is better than the digital wells′,water radon and the hydrochemistry are the especially sensitive observation items in Fujian region.The hotsprings′ earthquake-reflecting ability is better than the common ones′.The number of observation anomalies are decided by the number of observe stations around the epicenter.Also we point out that in order to serve the earthquake forecast better,we must construct a group of high quality water observational stations,which are able to meet the requirement of earthquake forecast so as to make all precursor observational stations to form a field or a net,strengthening the most sensitive wells and sensitive observational components.
引文
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[2]廖丽霞,黄可琴,黄声明,等.中酸性岩浆岩地区水文地球化学组分映震能力初探[J].地震,2002,22(4):42-48.
[3]廖丽霞,廖春奇.花岗岩层岩性与水文地球化学指标映震能力的探讨[J].华南地震,2002,22(3):44-51.
[4]简春林,晏锐,黄辅琼.中国大陆23个震例流体异常时空分布特征研究[J].地震,2006,26(1):99-106.
[5]叶秀薇,杨马陵,贾庆华.粤闽地区水化学地震前兆异常特征分析[J].地震地磁观测与研究,2004,25(6):17-23.
[6]孟晓春.地震观测与分析技术[M].北京:地震出版社,1998.73-101.
[7]车用太,鱼金子.地震地下流体学[M].北京:气象出版社,2006.328-332.
[8]车用太,鱼金子.地下流体典型异常的调查与研究[M].北京:气象出版社,2004.325-366.
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