2018GL079872.pdf (2.48 MB)

Detecting Real Earthquakes Using Artificial Earthquakes: On the Use of Synthetic Waveforms in Matched-Filter Earthquake Detection

Download (2.48 MB)
journal contribution
posted on 09.02.2021, 19:08 by Calum Chamberlain, John Townend
©2018. American Geophysical Union. All Rights Reserved. Matched-filters are an increasingly popular tool for earthquake detection, but their reliance on a priori knowledge of the targets of interest limits their application to regions with previously documented seismicity. We explore an extension to the matched-filter method to detect earthquakes and low-frequency earthquakes on local to regional scales. We show that it is possible to increase the number of detections compared with standard energy-based methods, with low false-detection rates, using suites of synthetic waveforms as templates. We apply this to a microearthquake swarm and an aftershock sequence, and to detect low-frequency earthquakes. We also explore the sensitivity of detections to the synthetic source's location and focal mechanism. Source-receiver geometry has a first-order control on how sensitive matched-filter detectors are to variations in source location and focal mechanism, and this likely applies to detections made using both synthetic and real templates.

Funding

The Straw that didnt Break the Camels Back: What Variations in Stressing-rate can Faults Withstand? | Funder: ROYAL SOCIETY OF NEW ZEALAND | Grant ID: 17-VUW-121

History

Preferred citation

Chamberlain, C. J. & Townend, J. (2018). Detecting Real Earthquakes Using Artificial Earthquakes: On the Use of Synthetic Waveforms in Matched-Filter Earthquake Detection. Geophysical Research Letters, 45(21), 11-649. https://doi.org/10.1029/2018GL079872

Journal title

Geophysical Research Letters

Volume

45

Issue

21

Publication date

16/11/2018

Pagination

11-649

Publisher

American Geophysical Union (AGU)

Publication status

Published

Online publication date

09/11/2018

ISSN

0094-8276

eISSN

1944-8007

Language

en

Exports