体应变潮汐观测资料信息提取与映震效果

根据体应变观测资料的特点, 研究了体应变观测资料的处理方法, 提出了在时间域分析的数学模型。在数学模型中, 将潮汐因子、气压系数、非潮汐应变速率和加速度一并考虑, 在资料处理结果中, 这些参数可同时取得。分别用时间域分析方法和频率域分析方法对观测数据进行了处理, 发现潮汐因子、气压系数、应变速率和加速度等参数在大同地震前均有大小不同、持续时间不等的异常, 这些参数可作为物理意义明确的地震中短期预测的指标。

Information extracted from the observed data of volume strain tides and its response to earthquakes

Based on the characteristics of the observed data of volume strain tides, a time-domain mathematical model is proposed to process the observed data of volum estrain tides. In the model, tidal factor, barometrical coefficient, no n-tidal strain rate and acceleration are simultaneously considered and computed in the process. The observed da ta a reprocessed separately in time domain and frequency domain. It is found that anomalies of different amplitudes and duration times in the above-mentioned parameters appeared before 1989 Datong M^6.1 earthquake sequence. These parameters seem to have definite physical meanings when used as indicators for medium- and short-term earthquake prediction.