Event-Event Waveform Correlation and Multi-Event Multi-Channel Deconvolution Applied to Temporal-Spatial Patterns of Micro Earthquake Sequences (Swarms)
Description:
Event-event multi-channel waveform correlation and multi-event multi-channel deconvolution is applied to two recent sequences of micro-earthquakes in South Carolina (Elgin and Monticello Reservoir). Clustering of events based on event-event multi-channel waveform correlation is used to identify separate spatial clusters of co-located events independent of prior localization procedures. That is, event-event waveform correlations identify repeated ruptures on individual localized asperities. The inferred hypocentral distances between the events on the same asperity may be smaller than the individual event location uncertainties. Small events with poor SNR with uncertain locations may be identified as belonging to localized spatial clusters. The clustered waveforms may then be used as matched-filter templates to further detect even smaller events related to the asperity. A statistical procedure is proposed to evaluate the probability of false event detection is presented. The resulting sequential pattern of event time series on the individual asperities then may be studied with more detail. A nearest neighbor temporal-spatial analysis is applied to characterize the sequences within and between asperities. Once decomposed into individual asperities, the event sequences on each asperity begin to resemble a fore-shock, main-shock after-shock sequences. A multi-event multi-channel deconvolution procedure of Der et al (1988) is applied to individual clusters to study more detailed temporal rupture variations on the individual asperities and reveal complex source functions.
Der, Z. A., R. H. Shumway, and A. C. (1988). Frequency Domain Coherent Processing of Regional Seismic Signals at Small Arrays, Bull. Seism. Soc. Am., 78, 326-338.
Session: Advances in Operational and Research Analysis of Earthquake Swarms [Poster Session]
Type: Poster
Date: 5/3/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Keith
Student Presenter: No
Invited Presentation:
Authors
Keith McLaughlin Presenting Author Corresponding Author mclaughlin0kl@me.com Leidos |
Steven Jaume JaumeS@cofc.edu College of Charleston |
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Event-Event Waveform Correlation and Multi-Event Multi-Channel Deconvolution Applied to Temporal-Spatial Patterns of Micro Earthquake Sequences (Swarms)
Category
Advances in Operational and Research Analysis of Earthquake Swarms