【摘要】 强震在孕育过程中,在一定的时空范围内多数伴随大量的地震时空集中活动。在前人研究的基础上,提出了含义明确、适用性好的刻画地震时、空分布均匀程度的定量参数Ct和Cd。研究了宁夏及邻区的5个MS≥5.5地震,以及我国华北的4个MS≥6.0的地震,发现震前几个月或1年左右,Ct和Cd值有一明显的异常上升过程,表明震前地震在时间、空间分布上有明显的集中过程。更多还原

【Abstract】 During the seismogenic process of strong earthquakes the space-time centralized activity in a definite space-time range is always accompanied. Two quantitive parameters with clear meaning and fine applicability to describe the earthquake space-time uniformity degree have been given on the basis of previous works. Through the study on 5 earthquakes with M_S≥5.5 occurred in Ningxia and its neighboring region and 4 earthquakes with M_S≥6.0 occurred in North china, it is showed that there exists obviously abnormal rise process of C_t and C_d value in couple mouths or around one year before main shocks, indicating that there exists obviously centralized process in earthquake space-time distribution before strong shocks.更多还原