思茅井水位同震阶变统计特征  

THE COSEISMAL RESPONSE CHARACTERISTIC OF WATER LEVEL IN SIMAO DAZHAI WELL IN YUNNAN PROVINCE

作　　者：毛巍颖 MAO Weiying(Yunnan Earthquake Agency,Kunming 650224,China)

机构地区：[1]云南省地震局

出　　处：《高原地震》2019年第4期28-34,共7页Plateau Earthquake Research

基　　金：国家自然基金重点项目“云南地区强震地下流体前兆特征及机理研究”(项目编号:UI602233)资助

摘　　要：对云南省思茅井自观测以来30多年的井水位数据进行统计,得到27次同震阶变。分别用杨竹转和Roeloffs的井水位同震阶变幅度、震级、井震距统计关系,对思茅井水位同震阶变进行计算。结果显示,用杨竹转的lgΔhi=0.319M-0.375lgD-0.087关系,计算出的思茅井水位同震阶变幅度较Roeloffs的lgΔh=0.89M-1.63lgD-0.69关系更符合思茅井的实际情况;用杨竹转的M≥3.104+1.176lgD和Roeloffs的M≥1.55+1.82lgD关系,对思茅井水位同震阶变地震的井震距计算其相应的震级,2个统计关系计算出的震级与实际震级差均在1级左右,其中Roeloffs的M≥1.55+1.82lgD关系更符合1000 km以外的8级大震。Based on the analysis on the data of water level in Simao Dazhai Well and 95 events since 1988,the water level in Simao Dazhai Well has shown good coseismal response ability not only to M≥7 which occurred in Yunnan and its nearby provinces and to large earthquakes of M≥8 which occurred at more than 2000 km,but also to small quakes of M≥3~4 which occurred at 10 km away.The correlations between magnitude of coseismal response event and distance may be 120 km of M5.0~5.9,300 km of M 6.0~6.9,700 km of 7.0~7.9,3000 km of M8.0~8.9.The up-step coseismal responses of water level has been shown in Simao Dazhai Well since 1988,it is calculated that the mode of coseismal responses of water level in Simao Dazhai No.17 Well is not controlled by mechanism and earthquake fault of events.

关 键 词：井水位 同震响应 阶变上升 统计特征 

分 类 号：P315.3[天文地球—地震学]