摘要
收集和统计了2008年汶川MS8.0地震、2010年玉树MS7.1地震和2013年芦山MS7.0、岷县MS6.6地震引起的中国大陆井水温同震响应现象,分析了其特征。结果显示:这4次地震对中国大陆地下流体影响显著,井水温同震响应特征有很大差异,后三次水温同震响应范围、幅度和持续时间远不及汶川地震,即使震级相差不大的玉树和芦山地震,同震响应的特征也不尽相同。最后探讨了这种现象的成因机理。
The study of co-seismic response is one of the most direct and effective methods of re- vealing the stress and strain response law of the crust, which a key issues in Earth science. To some extent, the co-seismic response of groundwater temperature reflects the crustal deformation and ground vibrations caused by subsurface deformation, pores, or fissure changes, and vertical migration of groundwater. The 2008 Wenchuan （ Ms8.0）, 2010 Yushu （ MsT. 1）, and 2013 Lus- han （ Ms7.0）, and Minxian （Ms6.6） earthquakes had substantial impacts on subsurface fluids in the Chinese mainland; however, the co-seismic response characteristics caused by the four earth- quakes differed significantly. The range, magnitude, and duration caused by the last three earth- quakes were far lower than those of the Wenchuan earthquake. Although the response character- istics caused by the Yushu and Lushan earthquakes differed, they had essentially the same magni- tude. The co-seismic effect caused by the Wenchuan earthquake was significantly higher than that of the other earthquakes. Although seismic responses were noted throughout the entire Chinese mainland after the Wenehuan earthquake, similar shock responses were detected mainly near theepicenters of the earthquakes. The co-seismic effects caused by the same-magnitude Yushu and Lushan earthquakes also differed. For example, the effect was observed in North China, central China, Sichuan, Yunnan, and Tibet after the Yushu earthquake; however, that of the Lushan earthquake was concentrated mainly near the epicenter in Sichuan, Yunnan, Chongqing, and oth- er areas. Therefore, the influence of Yushu earthquake may be much larger than the Lushan earthquakes. The co-seismic amplitude of the Wenchuan earthquake was generally higher than that of the other three earthquakes; however, it was significantly higher near the epicenter of the earthquake. The depth of sensors in the well water had a very strong influence on co-seismic re- sponse because the co-seismic direction and magnitude differed when the water temperature sensor was placed at different depths in the same well. This phenomenon may be related to epicentral distance and magnitude and may be affected by the rupture mechanism and the stress and strain sensitive extent response to aquifer media of the observation points.
出处
《地震工程学报》
CSCD
北大核心
2013年第3期535-541,共7页
China Earthquake Engineering Journal
基金
中央级公益性科研院所基本科研业务专项(ZDJ2012-08)
"十一五"国家科技支撑项目(2008BAC38B04-02-01)
关键词
井水温
同震响应
汶川地震
玉树地震
芦山地震
岷县地震
well water temperature
co-seismic responses
Wenchuan earthquake
Yushu earth-quake
Lushan earthquake
Minxian earthquake
