四川地区地下水位对汶川地震的同震效应
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摘要
系统地清理、分析了四川地区2008年汶川地震时在测水位观测到的同震效应。结果显示:汶川地震的水位同震效应以阶跃变化中的阶升变化为主,同时兼有持续缓慢变化、潮汐畸变变化、无变化、脉冲变化和突跳式变化。研究表明:阶升、阶降井点在空间上分布不均匀,相对于震中位置的关联性不强,但距离震中越近,阶升的台项越多。震时水位变化幅度不是简单地随井震距的变大而衰减。
In this paper,coseismic water-level changes of Wenchuan MS8.0 earthquake in Sichuan area are analyzed.The results indicate that the coseismic water-level changes are mostly of step rising variation accompanied by continual slow change,tidal distortion,impulse and jump.The distribution of the coseismic water-level step changes is not uniform.The closer to the epicenter the more step rising anomalies there are,but the amplitude of the water level changes do not simply decrease with the distance to the epicenter.
In this paper,coseismic water-level changes of Wenchuan MS8.0 earthquake in Sichuan area are analyzed.The results indicate that the coseismic water-level changes are mostly of step rising variation accompanied by continual slow change,tidal distortion,impulse and jump.The distribution of the coseismic water-level step changes is not uniform.The closer to the epicenter the more step rising anomalies there are,but the amplitude of the water level changes do not simply decrease with the distance to the epicenter.
引文
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[2]杨竹转,邓志辉,赵云旭,等.云南思茅大寨井水位同震阶变的初步研究[J].地震学报,2005,27(5):569-574.
[3]晏锐.汶川8.0级地震引起的中国大陆井水位同震响应特征分析[J].国际地震动态,2009,(4):32-32.
[4]苏树朋,李津津,张勤,等.易县地震台形变资料对汶川8.0级大地震的反应[J].华北地震科学,2009,27(2):54-58.
[2]杨竹转,邓志辉,赵云旭,等.云南思茅大寨井水位同震阶变的初步研究[J].地震学报,2005,27(5):569-574.
[3]晏锐.汶川8.0级地震引起的中国大陆井水位同震响应特征分析[J].国际地震动态,2009,(4):32-32.
[4]苏树朋,李津津,张勤,等.易县地震台形变资料对汶川8.0级大地震的反应[J].华北地震科学,2009,27(2):54-58.
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