Study on Spatial Correlation Structure of Earthquake Ground Motion Using Seismographic Dense Array Data

En, Koshiro

doi:10.3130/aijs.61.55_3

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Depth Dependency Of Coherency1

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2017

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“…(2015) 19) represented the real phenomenon in which the transfer function varies depending on the earthquake (incident wave) by regarding the transfer function as a random variable in the following Equation (2). In this case, the coherency of the input γX ij and the coherency of the output γY ij between two points separated in the horizontal direction are correlated by a factor (C ij = γY ij /γX ij ) that contains H i and H j , the expected value of the transfer function at points i and j.…”

Section: Depth Dependency Of Coherencymentioning

confidence: 99%

Spatial Variation and Its Stochastic Modeling of Seismic Ground Motions in Hard Soil Based on Three-Dimensional-Dense-Array Strong-Motion Observation Records

2017

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This study used strong-motion records from the three-dimensional-dense -array observation network at the Hamaoka Nuclear Power Plant to evaluate the spatial variation (coherency and variation in Fourier amplitude ratio between points) of seismic motion in hard soil. The evaluated spatial variation characteristics of seismic motion were used to derive statistical models based on regression analysis. The results showed that coherency decreased with increasing frequency and distance. Meanwhile, variation in Fourier amplitude ratio increased with increasing frequency and distance below 5 Hz.

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Section: Depth Dependency Of Coherencymentioning

confidence: 99%