Extracting surface wave dispersion curves from two-station microtremor analysis in heterogeneous ambient noise wavefield

Tatsunori Ikeda, Takeshi Tsuji, Chisato Konishi, Hideki Saito

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


The microtremor survey method (MSM) has been established as a method to estimate shallow S-wave velocity profiles from passive seismic data (i.e., microtremors). Although array analyses usually used in MSM are robust, a two-station microtremor analysis is attractive because it has a large potential to improve lateral resolution and applicability of MSM. However, applications of two-station microtremor analysis are limited probably because heterogeneous source distributions of microtremors expected in exploration studies (>1 Hz) are not considered in conventional processing. In this study, we propose a workflow to estimate surface-wave dispersion curves between two-stations considering heterogeneous distribution of microtremor energy for exploration data. In our approach, we estimate both phase and group velocity dispersion curves between each station pair, modeling azimuthal-dependent microtremor energy. Our field data application demonstrates that compared to conventional two-station analyses without consideration of noise heterogeneity, we can extract reliable phase velocity dispersion curves in wider frequency ranges. A number of dispersion curves between two-stations by our approach can be therefore useful to construct high-resolution 3D S-wave velocity structure by applying surface-wave tomography.

Original languageEnglish
Article number2851
Pages (from-to)3442-3446
Number of pages5
JournalSEG Technical Program Expanded Abstracts
Publication statusPublished - 2020
EventSociety of Exploration Geophysicists International Exhibition and 90th Annual Meeting, SEG 2020 - Virtual, Online
Duration: Oct 11 2020Oct 16 2020

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology
  • Geophysics


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