安阳及邻区中强地震前波速比时空演化特征分析与研究
|
摘要
本文运用安阳及邻区研究范围内,地震台网所能接收到的 S-P≤25.0 秒的所有台站记录到的ML≥2.0级地震的P波到时和 S 波到时进行了波速比计算,并对研究区域内 5 次中强地震前波速比变化作了空间演化图。从 2001年5月到现在波速比空间演化特征来看,明显出现了低值异常集中区和高低值异常交替区。从时间序列演化特征来看,波速比始终处于低于平均值1.70 以下。根据我们以往对研究区域内波速比的研究和对比分析,在未来24个月,研究区域存在发生 ML≥5.5 级±0.5 级地震的可能。
This paper calculates the velocity ratios of the P-waves and S-waves of earthquakes of MI≥2.0 recorded in all stations of S-P≤25.0S received in all seismological networks within Anyang and its adjacent regions, and constructs special evolution pattern of the variations in the velocity ratios before the 5 moderately strong earthquakes in the studied area. It has shown obvious low-values section and high-low values sections according to the analysis of special evolution characteristics since May, 2001. By time queue, the velocity ratios always vary below 1.70, a value lower than average. Based on our study and contrast analysis of velocity ratio in the studied area, we predict that there is possibility of earthquakes of ML≥5.5±0.5 in the coming 24 months.
This paper calculates the velocity ratios of the P-waves and S-waves of earthquakes of MI≥2.0 recorded in all stations of S-P≤25.0S received in all seismological networks within Anyang and its adjacent regions, and constructs special evolution pattern of the variations in the velocity ratios before the 5 moderately strong earthquakes in the studied area. It has shown obvious low-values section and high-low values sections according to the analysis of special evolution characteristics since May, 2001. By time queue, the velocity ratios always vary below 1.70, a value lower than average. Based on our study and contrast analysis of velocity ratio in the studied area, we predict that there is possibility of earthquakes of ML≥5.5±0.5 in the coming 24 months.
引文
1张培震,邓起东,张国民等.主要活动地块划分的说明(内部交流使用)
2河南省《地震观测报告》,1979年—2003年9月
3河北省《地震观测报告》,1979年—2003年9月
4山东省《地震观测报告》,1980年—2003年9月
5山西省《地震观测报告》,1995年—2003年9月
6国家地震局科技监测司.1990年
[1]冯德益,地震波速异常[M],北京:地震出版社,1981
[3]张培震,邓起东,张国民等.中国大陆的强震活动与活动地块[J].中国科学,200332～37
2河南省《地震观测报告》,1979年—2003年9月
3河北省《地震观测报告》,1979年—2003年9月
4山东省《地震观测报告》,1980年—2003年9月
5山西省《地震观测报告》,1995年—2003年9月
6国家地震局科技监测司.1990年
[1]冯德益,地震波速异常[M],北京:地震出版社,1981
[3]张培震,邓起东,张国民等.中国大陆的强震活动与活动地块[J].中国科学,200332～37
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心