摘要
本文对1983年11月7日菏泽5.9级地震前后泰安、嘉祥、梁山、邹县地震台1974—1987年地震波形特征参数某些长期变化进行了初步研究。结果表明在较大地震前,通过孕震区的小震地震波形特征参数出现了一些较明显的中长期和短临异常变化。讨论了5.9级地震前孕震区小震直达波振幅比、振幅衰减系数、衰减速率、介质品质因子的异常变化特征,并结合震前地震活动图象、区域小震应力场的异常变化作了对比分析。
Some Long-term variations of seismic waveform characteristic parameters at Taian, Jia-xiang, Liangshan and Zouxian seismic stations in 1974-1987 around Heze M 5.9 earthquake on November 7, 1983 were preliminarily studied in this paper. Results show that before a relatively large earthquake, the characteristic parameters of small earthquake wave passing through the earthquake preparation region show some obvious mid-long term and short-imminent anomalous variations, the anomalous variation featurs of the direct wave amplitude ratio, amplitude attenuation coefficient, attenuation rate and medium quality factor of small earthquakes in the earthquake-preparation region prior to the earthquake M 5.9 are discussed and a synthetic analysis was made by combining abnomal variations of the seismic pattern and regional stress-field of small earthquakes before the main shock.
出处
《地震》
CSCD
北大核心
1991年第1期36-44,共9页
Earthquake
