2012 IRIS Workshop

Spectral Analysis for Earthquake Cluster Detection

Deb Fagan: Boise State University, Kasper van Wijk: Boise State University, Jim Rutledge: MEQ Geo

What was identified as a single cluster of microseismic events, based on p- and s-wave arrival times, turns out to break down in two distinct sets of events with each a characteristic power spectrum. The time series for these events are highly correlated, but their power spectra are shifted by a small but significant amount. This indicates either failure on two separate faults, or a fault extending from one formation into another.

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