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Comparison of the 1999 Chi-Chi Mw 7.6 Earthquake and the 2008 Wenchuan MS 8.0 Earthquake

机译:1999年Chi-Chi Mw 7.6地震与2008汶川MS 8.0地震的比较

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p value in Omori’s law and the b value in G-R relation are probably the most broadly accepted statistics in seismicity study. In this paper, we focused on the p and b values of two great earthquake sequences occurred in China, the 1999 Chi-Chi Mw7.6 earthquake and the 2008Wenchuan Ms8.0 earthquake. We calculated both values of each sequence, analyzed some statistic characters of these values, compared them, and drafted some features based on the calculation and comparison. By comparing the temporal variation of bvalue with the moment cumulating, we found that almost each inflexion on the cumulative moment curve corresponded to a sharp hop on the temporal fluctuation of b value. This might due to the fact that b value indicates stress condition in the same region. Earthquake releases strain energy, causing stress to change. As a result, the temporal undulation of b value may indicate the variation of stress condition. Furthermore, we attempted to explain the different aftershock distribution pattern of the two earthquakes. The primary determinants, referring to geological data, may be the trend and pattern of the fault system and stress state in the aftershock district.
机译:大森定律中的p值和G-R关系中的b值可能是地震活动研究中最广泛接受的统计数据。在本文中,我们着眼于中国发生的两次大地震序列的p和b值,即1999年的Chi-Chi Mw7.6地震和2008年的汶川Ms8.0地震。我们计算了每个序列的两个值,分析了这些值的一些统计特征,将它们进行了比较,并根据计算和比较起草了一些特征。通过将b值的时间变化与力矩累积进行比较,我们发现,累积力矩曲线上的几乎每个拐点都对应于b值的时间波动的跃变。这可能是由于b值表示同一区域的应力状态。地震释放出应变能,导致应力发生变化。结果,b值的时间波动可能指示应力条件的变化。此外,我们试图解释两次地震的不同余震分布模式。参照地质数据的主要决定因素可能是余震区断层系统的趋势和模式以及应力状态。

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