Velocity analysis and moveout-based event detection using downhole DAS records

Ariel Lellouch*, Siyuan Yuan, Zack Spica, Biondo Biondi, William L. Ellsworth

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

We show how vertical downhole distributed acoustic sensing arrays can be used for P- and S- velocity analysis along the array. Using such velocity models, the array can be used in an effective moveout-based earthquake detection approach. We demonstrate both applications on 20 days of passive records at the San Andreas Fault Observatory at Depth, which comprises of a ~800 m deep vertical array. Estimated P velocities are comparable to an active geophone survey and S velocities are extracted for the first time in the area. Over 75% of the events in the USGS catalog in the area are detected, as well as a new earthquake.

Original languageEnglish
Pages989-993
Number of pages5
DOIs
StatePublished - 2020
Externally publishedYes
EventSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019 - San Antonio, United States
Duration: 15 Sep 201920 Sep 2019

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
Country/TerritoryUnited States
CitySan Antonio
Period15/09/1920/09/19

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