印尼8.6级地震甘肃地区流体观测资料同震响应分析
Co-seismic Response in Fluid Observation Data from Gansu duringthe Indonesia M8.6 Earthquake

2012年4月11日印尼苏门答腊发生8.6级、8.2级地震，我国大量地下流体台站记录到丰富的同震响应现象，甘肃地下流体观测资料也出现不同程度的同震响应。本文分析两次大地震时甘肃地区数字化水位、水温同震变化特征和响应能力，得到大部分井水位的同震响应有较一致的变化规律，且以振荡变化为主，震后较快恢复到原有状态，响应程度也与震级密切相关，即震级越大响应能力越强；由于水温和水位有不同的响应机理，因此水温不遵循这种规律，水温观测只有2个井点记录到同震响应，且记录的幅度基本相当，变化周期较大，恢复时间也较慢。
During the occurrence of two strong earthquakes (M8.6 and M8.2) in Sumatra,Indonesia,on April 11,2012,a large number of underground fluid stations in China recorded abundant co-seismic response data,and data from underground fluid observations in Gansu also showed various degrees of co-seismic response. The co-seismic changes and the digital response of water levels and temperatures in Gansu during these two great earthquakes are analyzed in this study. The results show that the water level co-seismic response in most wells followed a relatively consistent change law,i.e.,the change was main oscillation variation,and rapidly recovered to its original state after the earthquake. The degree of response is closely related to the magnitude; the greater the magnitude,the stronger the response. Owing to the different response mechanisms of water level and temperature,water temperature does not follow this rule. In water temperature observations,only two wells had a record of co-seismic response,they showed approximate amplitudes and a relatively long cycle time (change period),but a slower recovery time.