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山西洪洞井水位对远场大震的响应特征分析
李颖1,2, 殷伟伟1,2, 胡玉良1,2, 程冬焱1,2, 穆慧敏1,2
1.山西省地震局, 太原市旧晋祠路二段69号 030021;2.太原大陆裂谷动力学国家野外科学观测研究站, 太原市晋源区太原基准地震台 030025
摘要:
对洪洞井水位自2013年数字化改造以来记录到的同震响应资料进行统计分析后认为:洪洞井水位对全球MS≥7.5的远场大震有较好的响应能力,其同震响应呈一定的方向性;对不同地震的响应形态具有固定模式,以水震波为主,部分水震波伴随阶变;水位振荡阶变的初始方向以上升为主。统计分析显示,井水位同震变化幅度与震级、井震距无明显相关性,水位响应时刻与井震距有一定关系。进一步核实表明:引起水位同震响应的地震波大多为S波,部分为P波、面波;S波引起的水位变化幅度要小于P波,而面波引发的水位变化幅度最大。综合分析了前人对水位振荡的机理研究,并结合洪洞井具体情况对其相关机理进行了初步探讨。
关键词:  水位  同震响应  远场大震  机理解释
DOI:
分类号:P315
基金项目:山西省地震局科研项目(SBK-1706)资助
The Characteristics Analysis on Co-seismic Response of Water Level to Remote Strong Earthquakes in the Hongtong Well,Shanxi
Li Ying1,2, Yin Weiwei1,2, Hu Yuliang1,2, Cheng Dongyan1,2, Mu Huimin1,2
1.Shanxi Earthquake Agency, Taiyuan 030021, China;2.State Key Observatory of Shanxi Rift System, Taiyuan 030025, China
Abstract:
The co-seismic response of water level in the Hongtong well to remote strong earthquakes were systematically analyzed since the digital transformation in 2013,and the results represented that the water level in the Hongtong well had a good response capability of recording earthquakes(MS ≥ 7.5),and co-seismic response of the Hongtong well showed a certain direction;to different earthquakes the co-seismic response forms of water were mainly water waves,part of the water waves was given accompanied by step changes and the initial direction of co-seismic step change was mainly rising. Statistical analysis showed that the amplitude of water level had a poor correlation with the epicentral distance and magnitude,and the epicentral response time had a quantitative relationship with the epicentral distance. Further verification indicated that the most of co-seismic responses were caused by S-wave,some of which being surface waves,or P-wave and the change of water level caused by S-wave is smaller than that of P-wave,among which the surface wave is the largest. In this paper,the mechanism of water level oscillation of the predecessors' research was analyzed,and the preliminary discussion on its related mechanism was given combining the Hongtong well specific circumstances change.
Key words:  Water level  Co-seismic responses  Remote strong earthquake  Mechanism explain