江苏流体井网对汶川和日本地震的同震响应特征研究
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摘要
通过对2008年汶川8.0级和2010年日本9.0级两次大地震的同震响应特征进行分析,讨论了经过数字化改造后的江苏流体观测井网映震能力,对不同测点井孔映震能力出现较大差异的原因进行了探讨,结果表明:(1)江苏区域井孔水位的同震响应能力强于水温,水位同震响应有较一致的变化规律,同时与震级密切相关,水温同震响应在不同井点存在较大差异,更多的表现为缓慢的恢复变化;(2)不同构造单元的井孔同震响应能力有明显差异,苏中和苏北地区的同震响应变化弱于苏南地区,这种南强北弱的原因可能是苏中黄土覆盖层较厚的构造特征使其在捕捉应力—应变状态的微变化时较南部丘陵地带弱,南部较为复杂的地质构造在受到微小扰动后更有利于地下水状态的变化。
Through the analysis of co-seismic responses features of Wenchuan M8.0 and Japan M9.0 earthquakes,we discussed the earthquake reflecting ability of the Jiangsu Fluid Observation Well Pattern System which had been digitized reformed and the reason of the major difference of earthquake reflecting ability of well holes at different measuring points. The result indicated that:(1) The co-seismic responding ability of water level was stronger than that of water temperature in regional well holes in Jiangsu. The water-level co-seismic responses had a consistent change law,and were closely related to the magnitude. The co-seismic responses of water temperature were great different at different well points,which were manifested as a slow restorative change. (2)There was difference of co-seismic responding ability at different well holes in different tectonic units. The co-seismic response change in central and northern Jiangsu area was weaker than that in southern Jiangsu area,whose reason is the tectonic characteristics of the thicker upper loess covering layer in central Jiangsu was weaker than the hilly country in southern Jiangsu in capturing the micro-changes of stress-strain states. The relatively complicated geological structure in southern Jiangsu became more favorable to the change of underground water state by the tiny disturbance.
引文
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