Simulated Empirical Law of Coseismic Crustal Deformation.
Simulated Empirical Law of Coseismic Crustal Deformation.
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同震地壳变形的模拟经验定律。
DOI：
10.4294/jpe1952.43.697
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Y. Okada
中科院分区：
文献类型：
--
作者：
Y. Okada
利用蒙特卡罗方法进行了模拟，得出了地震震级M、震源距离R和地表预期静态变形量之间的假想经验规律。假设一百万个震源中的每个震源都有一个点双偶，研究了位移、应变和倾斜的频率分布。结果表明：1)地壳形变预期最大值可表示为静位移logUmax=1.5M-2logR(km)-6.0 U（cm)，静应变和倾斜logFmax=1.5M-3logR(km)-10.7 F. 2）地壳形变预期平均值为上述预期最大值的1/3-1/4。3)变形的整体分布局限在较窄的范围内，大部分分布在最大值和平均值的1/10之间。虽然上述结果只能作粗略估计，但所得的经验规律不仅对设计地壳形变观测网有用，而且对评价地震事件的影响也有用。
An imaginary empirical law to relate earthquake magnitude, M, hypocentral distance, R, and the amount of expected static deformation of the Earth's surface was derived by a simulation using the Monte Carlo method. Assuming a point double couple for each of a million seismic sources, the frequency distributions of displacement, strain and tilt were examined. The results are summarized as follows: 1) Expected maximum values of crustal deformation can be expressed by logUmax=1.5M-2logR(km)-6.0 for static displacement, U(cm), logFmax=1.5M-3logR(km)-10.7 for static strain and tilt, F. 2) Expected average values of crustal deformation are 1/3-1/4 of the expected maximum values stated above. 3) The whole distributions of deformation are confined within relatively narrow ranges, and most are between the maxima and 1/10 of the averages. Although the above results can be used only for rough estimation, the obtained empirical law is useful not only for designing an observation network of crustal deformation but also for evaluation of the influences of seismic events.