刘继录, 张从珍, 曹肃朝, 李玉, 周建成. 张北6.2级地震前后地震波速比在源区与场区的变化特征[J]. 华北地震科学, 2001, 19(2): 14-20.
引用本文: 刘继录, 张从珍, 曹肃朝, 李玉, 周建成. 张北6.2级地震前后地震波速比在源区与场区的变化特征[J]. 华北地震科学, 2001, 19(2): 14-20.
LIU Ji-lu, ZHANG Cong-zhen, CAO Su-Chao, LI Yu, ZHOU Jian-cheng. THE VARIATION CHARACTER OF SEISMIC VELOCITY RATIO IN SOURCE REGION AND FIELD AREA BEFORE AND AFTER ZHANGBEI MS6.2 EARTHQUAKE[J]. North China Earthquake Sciences, 2001, 19(2): 14-20.
Citation: LIU Ji-lu, ZHANG Cong-zhen, CAO Su-Chao, LI Yu, ZHOU Jian-cheng. THE VARIATION CHARACTER OF SEISMIC VELOCITY RATIO IN SOURCE REGION AND FIELD AREA BEFORE AND AFTER ZHANGBEI MS6.2 EARTHQUAKE[J]. North China Earthquake Sciences, 2001, 19(2): 14-20.

张北6.2级地震前后地震波速比在源区与场区的变化特征

THE VARIATION CHARACTER OF SEISMIC VELOCITY RATIO IN SOURCE REGION AND FIELD AREA BEFORE AND AFTER ZHANGBEI MS6.2 EARTHQUAKE

  • 摘要: 计算了1991年~1999年发生在北纬39°00'~42°00',东经112°30'~116°00'范围内的ML≥2.0级地震的波速比,分析了张北6.2级地震前后源区与场区波速比的时空变化特征及其差异,发现6.2级地震前源区和场区波速比在时间分布上都出现较明显的低值异常:下降-低值-平静-恢复-发震过程。在空间分布上低值异常比较集中和同步。对计算结果进行了t检验,源区与场区波速比的时空变化及t检验表明6.2级地震前源区与场区波速比异常非常明显,场区1995年开始出现波速比在正负之间比较大的变化后持续低值。6.2级地震后源区和场区的波速比计算结果一致,时空变化均为正常。

     

    Abstract: The seismic velocity ratio for earthquakes (ML≥2.0)during 1991 to 1999 in the region 112°30'~116°00'E,39°00'~42°00'N is calculated.The variation character in time and space and the differences of the seismic velocity ratios before and after Zhangbei Ms6.2 earthquake in source region and field area are analyzed.The results show that distinct low value anomalies of seismic velocity ratio in time distribution appeared in source region and field area before the event.The course is decline-low value-quietude-recovery-occurrence.The low value anomalies are concentrative and synchronous in spatial distribution.The calculation is tested with T-test.The results indicates that the seismic velocity ratio anomalies in source region and field area are very obvious before Zhangbei Ms6.2 earthquake.The seismic velocity ratio in field area sustained low value after great changes since 1995.The seismic velocity ratio became uniform and its time and space variation also became normal after the event.

     

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