Using centroid time-delays to characterize source durations and identify earthquakes with unique characteristics
Using centroid time-delays to characterize source durations and identify earthquakes with unique characteristics
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DOI：
10.1016/j.epsl.2013.05.024
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发表时间：
2013-07
影响因子：
5.3
通讯作者：
Z. Duputel;V. Tsai;L. Rivera;H. Kanamori
中科院分区：
文献类型：
--
作者：
Z. Duputel;V. Tsai;L. Rivera;H. Kanamori
M0和破裂持续时间之间的关系往往很难建立。对于矩率函数（MRF）通常具有复杂形状的大地震尤其如此，并且估计的持续时间可以根据用于评估MRF的方法而变化很大。在这项工作中，我们表明，质心时间延迟（τ c）提供了一个替代的估计源持续时间。倒置的MRF通常逐渐结束，使得同震破裂的结束难以检测。在这种情况下，当破裂持续时间不确定时，时滞τ c是表征破裂过程一阶时间特征的有用量。应力参数Δ σ的变化可以通过假定地震矩M0和τ c之间的标准比例关系来研究。这种简单的比例关系也可以用来识别具有独特震源特性的异常地震，例如涉及复杂破裂过程的事件或具有异常破裂速度、应力降或纵横比的地震。
The relationship between M 0 and the rupture duration is often difficult to establish. This is particularly true for large earthquakes for which the moment rate functions (MRF) generally have complicated shapes, and the estimated durations can vary considerably depending on the methodology used to evaluate the MRF. In this work, we show that the centroid time-delay (τ c) provides an alternative estimate of the source duration. Inverted MRFs often end gradually, making the end of coseismic rupture difficult to detect. In such cases, when the rupture duration is not well defined, the time-delay τ c is a useful quantity to represent the first-order temporal characteristics of the rupture process. Variations in stress parameter Δ σ can be investigated by assuming a standard scaling relationship between the seismic moment M 0 and τ c. This simple scaling relationship can also be used to identify unusual earthquakes, with unique source properties, such as events involving complicated rupture processes or earthquakes characterized by unusual rupture velocities, stress drops or aspect ratios.