One-Year of Near-Real-Time Matched-Filtering to Build Dense Earthquake Catalogs in New Zealand Using the Open-Source RT-EQcorrscan Software Package
Session: Waveform Cross-Correlation-Based Methods in Observational Seismology I
Type: Oral
Date: 4/21/2021
Presentation Time: 02:15 PM Pacific
Description:
Conventional earthquake detection methods suffer significant degradation in completeness during high-rate sequences such as aftershock sequences or volcanic swarms. Correlation-based detectors, known as matched-filters or template-matching methods, can be used to overcome some aspects of catalog incompleteness during high-rate sequences, by detecting similar events buried in the noise or coda of preceding events. Matched-filter detectors have received significant attention in the construction of earthquake catalogs in response to large events, or high-rate sequences, but are generally applied offline. Because such dense catalogs have the potential to be useful to inform responses to these events, we have developed the RT-EQcorrscan open-source software package, a near-real-time implementation of the matched-filter method to be used in response to significant events.
RT-EQcorrscan is designed to either run continuous near-real-time matched-filters or listen to web-services and “spin-up” near real-time detection runs when events of interest occur, using a continuously updated database of historical seismicity as templates. This system comprises several concurrent systems to allow for continued updates to the template database, multiple near-real-time workflows, multi-threaded waveform processing and correlation computation, and visualization. At the time of writing (January) this system has reacted to 189 sequences in the New Zealand GeoNet catalog, and has made 10,224 detections based on our configuration. In this presentation we will demonstrate the RT-EQcorrscan software package and it’s application over the 12 months from April 2020 to April 2021 to react to large earthquakes and high-rate sequences in New Zealand.
Presenting Author: Calum J. Chamberlain
Student Presenter: No
Authors
Calum Chamberlain Presenting Author Corresponding Author calum.chamberlain@vuw.ac.nz Victoria University of Wellington |
John Townend john.townend@vuw.ac.nz Victoria University of Wellington |
Matthew Gerstenberger m.gersetenberger@gns.cri.nz GNS Science |
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One-Year of Near-Real-Time Matched-Filtering to Build Dense Earthquake Catalogs in New Zealand Using the Open-Source RT-EQcorrscan Software Package
Category
Waveform Cross-correlation-based Methods in Observational Seismology