Propagation of Total Reflected Plane SH Pulses in a Dipping Layer
Propagation of Total Reflected Plane SH Pulses in a Dipping Layer
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全反射平面SH脉冲在浸渍层中的传播
DOI：
10.4294/zisin1948.38.4_597
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
S. Kinoshita
中科院分区：
文献类型：
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作者：
S. Kinoshita
为了研究东京大都市区前第三纪基底厚沉积层的地震反应，国家防灾研究中心在东京西部的阜中地区建立了一个小型强震观测阵。本文报道了震源位于台网西侧的浅层地震的沉积层地震反应。沉积层对SH波的响应特征可概括为：(1)在倾斜基底上边界的浅层地震中，观测到一个由全反射产生的SH脉冲序列。脉冲序列受到沉积层的调制，在阜中地区形成一个主要的伪love波，出现在直接SH脉冲之后。(2)用简单的倾斜层模型和平面波近似解释了这种伪love波。利用希尔伯特变换反复计算了全反射脉冲序列。
In order to investigate the earthquake response of thick sedimintary layer on the preTertiary basement in the Tokyo metropolitan area, the National Research Center for Disaster Prevention has established a small-scale strong-motion observation array at the Fuchu area in the west of Tokyo. In this paper, we report an earthquake response of sedimentary layer for the shallow earthquakes whose epicenters are located in the west of the array. The response characteristics of sedimentary layer for SH waves may be summarized as follows: (1) A SH pulse train produced by total reflections at the upper boundary of dipping basement, is observed during the earthquakes whose shallow origins are located in the west of the array. The pulse train is modulated by the sedimentary layer and becomes a predominant pseudo-Love wave which appears just after the direct SH pulse in the Fuchu area. (2) Such pseudo-Love wave is explained even by using a simple dipping layer model and the plane wave approximation. The train of total reflected pulses is calculated by using the Hilbert transform repeatedly.