摘要
收集云南地区井水温数字化观测资料,对比分析了2011年3月11日日本9.0级和2008年5月12日汶川8.0级2次地震引起的云南地区井水温同震响应特征。结果表明,不同构造区域的观测井的井水温同震响应存在差异,主要与井孔本身的特征和区域构造环境有关;同一口观测井对不同地震引起的水温响应变化形态基本一致,不受地震方位和震源机制的影响,井水温同震下降或上升响应幅度随震级的增大而增大,随震中距的增大而减小;井水温同震响应的机理主要是在地震波的作用下,观测井孔中的水体受震荡激发而加速对流与掺混导致水温发生变化,当地震波逐渐平息,探头附近的井水温逐步恢复。
Based on water temperature digital data of wells in Yunnan province,the characteristics of coseismic changes of water temperature caused by Japan M9.0 and Wenchuan M8.0 earthquakes are analyzed.The results show that the characteristics are different in the different structure areas,and this may be related with the conditions,local geological structures and tectonic environments;the characteristics are similar in the same well for the different earthquakes,and they are not related with the earthquake direction and mechanism,but the temperature will be increased with the earthquake magnitudes or decreased with the epicentral distances.Under the dynamic loading of seismic wave,the accelerated convection and mixing of different temperature water in virtue of seismic wave caused water temperature changes,when the fluctuation of seismic wave gradually is quiet down,the water temperature near the probe begins to normal.
出处
《高原地震》
2012年第1期16-22,共7页
Plateau Earthquake Research
基金
云南省基金重点项目"青藏高原东缘强震活动规律与板缘动力学机制(2010CC006)"
云南省十项措施"地球物理场和化学场动态变化与强震活动关系研究(JCYB-20080601-5)"联合资助
关键词
观测井
水温变化
同震响应
地震波
Observation well
Water temperature
Coseismic effects
Seismic wave
