矿震成核过程的公里尺度研究

成核过程是地震机理研究的重要部分.通过岩石实验、高温高压和数值模拟认为，地震成核的临界尺度为大地震总破裂长度的十分之一，一般为10~20 km左右；地震成核时间从年到秒、甚至毫秒.本文利用山东省宁阳县华丰煤矿立体台网的岩爆观测，进行了公里尺度的破裂成核过程实验研究.通过对华丰煤矿1995年2月~1996年5月期间的地脉动记录和12000次小震记录资料的分析，计算了它们的地脉动、S波和P波振幅比以及S波波峰的到时差，得到ML=2.9矿震的成核时间为50天，成核临界尺度为5 km.

Research on nucleation of earthquake in km-size experiment

Nucleation process was an important part of earthquake mechanism.Through rock experiment,high temperature or high press and numerical model,we hold that the time critical scale of earthquake nucleation is 1/10,it generally is about 10~20km;the time of earthquake is from year to minute,so far as to millisecond.In this paper,we used rock-explosion observation in Hurfeng coal mine,Ningyang County in Shandong Province to study km-scale nucleation process.seismic pulse and 12,000 small rockbursts recorded at Huafeng seismograph station was analyzed between Feb.in 1995 and May in 1996.The result shows that the critical scale of earthquake nucleation is about 5 km,and the time of earthquake nucleation is about 50 days for a M_L=2.9 mine shock.