摘要
用R/S分析方法研究了大华北地区地震发生时间间隔的统计分形问题。对大华北地区18个3°×3°的地理分区1970年1月—1993年7月M_L≥2.5的地震发生时间,以相同的工作窗长(100个相邻地震时间间隔)沿时序滑动进行R/S方法分析计算。结果表明,对所工作的时空范围内的18个M_L≥5.5地震,有12个地震在震前0.5—4年Hurst指数H值出现下降、下降-持续低值或稍有回升的异常变化。
In this paper we studied the statistical fractal characteristics of seismic time intervals for the large North China by R/ S analytical method. The large North China region is divided into 18 subregions with 3° × 3°. For each subregion the low limitation of magnitude is ML≥2.5 from Jan. 1970-July. 1993. the temporal window lengths is 100 (time interval) . The results show that fractal coefficient-Hurst exponent H values are stable on the background of weak shocks. The anomalous variations of H values for 0.5-4 years before 12 earthquakes with ML≥5.5 among 18 events are found. The anomalous characteristics are decreasing, decreasing-keeping, then slightly returning the lower values.
出处
《地震》
CSCD
北大核心
1995年第4期372-378,共7页
Earthquake
基金
地震科学联合基金会资助课题(92336)
关键词
时间分布特征
地震预报
R/S分析
地震
时间间隔
Time distribution character, Earthquake prediction, R/ S analysis, Hurst exponent, Seismic time interval