Craig, TJ orcid.org/0000-0003-2198-9172 (2019) Accurate Depth Determination for Moderate‐Magnitude Earthquakes Using Global Teleseismic Data. Journal of Geophysical Research: Solid Earth, 124 (2). pp. 1759-1780. ISSN 2169-9356
Abstract
The determination of accurate source depths for globally observed earthquakes has long been one of the most problematic issues in earthquake source seismology. The optimal method for constraining the depths of teleseismically observed earthquakes is through the identification of near‐source surface reflections—depth phases. However, observing such phases is complicated by the relatively small amplitude of these arrivals compared to the background noise, particularly for earthquakes with Mw < 5.5. In this study, I present a methodology for leveraging the recent expansion in global seismic network coverage to enhance the identification of coherent depth phases through an automated stacking routine using a globally distributed array. While depth solutions for each individual depth phase are often nonunique, the identification of potential depths across multiple different phases, where each shows the correct distance‐dependent delay, provides a robust way to semiautomatically determine the source depth of an earthquake. I present a range of examples for the processing routine developed, along with an example for its regional application, to the North Chilean subduction zone. The technique presented offers an opportunity to improve depth estimates for earthquakes down to Mw4.9 and, requiring significantly less analyst input than other techniques offering a similar resolution, has the potential to be applied to large earthquake data sets.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019. American Geophysical Union. All Rights Reserved. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | seismology; earthquake depths; depth phases |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Funding Information: | Funder Grant number Royal Commission For Exhibition of 1851 No external ref Royal Society Not Known |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Jan 2019 11:03 |
Last Modified: | 30 Jul 2019 00:40 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1029/2018JB016902 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:141668 |