论文部分内容阅读
深阳6.0级地震前,震中周围较大区域内的地震活动性发生了明显变化,主要表现为震前较长时间里出现了地震活动的“空环”图象及震前半年较大范围内的地震活动平静。不同起始震级和范围内的b值及小震频度于1978年上半年出现同步上升,同期在“空环”边缘发生了两组前兆震群。单位面积的地震频度K服从幂函数分布N(K)=A/(1+K)P,其衰减系数P也于1978年出现了异常低值。这些异常变化反映了孕震的不同阶段。
Prior to the MS 6.0 MS 6.0 earthquake, the seismicity in a large area around the epicenter changed significantly, mainly as a result of the “empty-ring” image of seismic activity occurring a long time before the earthquake and a large area within the first half of the earthquake The seismic activity is calm. The b values and the magnitude of small earthquakes in different initial magnitudes and ranges increased synchronously in the first half of 1978, while two sets of precursory swarms occurred on the edge of the “empty ring” in the same period. The seismic frequency K per unit area obeys the power function distribution N (K) = A / (1 + K) P, and its attenuation coefficient P also appeared abnormally low value in 1978. These abnormal changes reflect the different stages of gestation.