岷县6.6级地震震前异常及其水位水温同震响应讨论 Analysis on Anomaly of 6.6-Magnitude Earthquake and Its Co-Seism Responses at Min County

分析了2013年7月22日甘肃岷县6.6级地震前甘肃地区的水位、流量和水温资料的变化情况，结果发现在这次地震前两个测点的资料存在明显的震前异常，其中清水李沟流量为中长期异常，清水温泉水温为短临异常。另外部分水位、流量和水温测点的资料记录到不同程度的同震效应，形态有突升、突降和缓变型等，持续时间不等，其中数字化水位、水温均在地震后10分钟至数小时之内恢复，而传统的人工流量观测持续1到2个月。记录同震响应的测点与震中位置、方向、距离无明显规律。 The variations of water level, flow and temperature data collected in Gansu area before the 6.6-magnitude earthquake of Min County on July 22th 2013 were analyzed. Two points showed evident abnormities just before this earthquake. The flow discharges of Ligou and Qingshui showed medium or long-term anomaly, while the temperature of thermal spring in Qingshui showed short-impending anomaly. Besides, the water level, flow and temperature in some stations recorded a different degree of coseismic response. The configurations of these responses included sudden rise, sudden drop and slow-change type. The duration of these responses varied. Digital-observed water level and temperature recovered in a time from 10 minutes to several hours after the earthquake, while the traditional man-observed flow lasted 1 to 2 months. The observation stations that had co-seism responses showed no obvious regularity with epicenter location, direction or distance.