1887
Volume 46, Issue 3
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

[

A procedure for estimation of Rayleigh wave phase velocities from microtremor observations, using an array with a reference station, is investigated in this study. Simultaneous observation of microtremors at a reference station and at a strong motion observation array in the Kanto Basin, Japan, was carried out. We first calculated cross correlations between records at the reference station and those at stations in the array using a seismic interferometric processing method on a 4300-h data series. After identifying dispersive Rayleigh waves from results of multiple filtering analysis of the cross correlations, semblance analysis of the cross correlations for different segments was carried out to estimate phase velocities for fundamental and higher-mode Rayleigh waves. The phase velocities from the proposed method are more appropriate than those from conventional methods at long periods as they avoid contamination by higher mode Rayleigh waves. The fundamental Rayleigh wave phase velocities were inverted to an S-wave velocity profile for deep sedimentary layers.

We also examined the variations in the phase velocity with decreasing data duration. The phase velocities at periods less than 3 s from 6-h records are similar to those from 4300-h records, suggesting that our method is possibly applicable in microtremor exploration.

,

An interferometric procedure for Rayleigh wave phase velocities from cross correlations of microtremors in an array with a reference station is investigated in this study. After identifying dispersive Rayleigh waves, semblance analysis of the cross correlations was carried out to estimate phase velocities for fundamental and higher-mode Rayleigh waves.

]
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2015-09-01
2026-01-13

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/content/journals/10.1071/EG14069
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Estimation of surface-wave phase velocity from microtremor observation using an array with a reference station
Exploration Geophysics 46, 267 (2015); https://doi.org/10.1071/EG14069
/content/journals/10.1071/EG14069
/content/journals/10.1071/EG14069
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  • Article Type: Research Article
Keyword(s): array observation; cross correlation; microtremor exploration; multi-modal Rayleigh wave; phase velocity; S-wave velocity; seismic interferometry

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