Regional seismicity: A potential pitfall for identification of long-period long-duration events

Author:

Caffagni Enrico1,Eaton David1,van der Baan Mirko2,Jones Joshua P.2

Affiliation:

1. University of Calgary, Department of Geoscience, Calgary, Alberta, Canada..

2. University of Alberta, Department of Physics, Edmonton, Alberta, Canada..

Abstract

Long-period long-duration (LPLD) events are tremorlike signals that have been observed during monitoring of hydraulic-fracture treatment programs. LPLD events have been interpreted to reflect slow deformation processes on fractures or faults that are misoriented for reactivation with respect to the present-day stress field. Regional earthquakes could easily be mistaken for LPLD events because both are characterized by similar frequency content ([Formula: see text]) and duration ([Formula: see text]). Using data from a 10.5-month continuous downhole deployment of a 15-Hz geophone array in a tight-sand gas field in western Canada, we compared recordings of small earthquakes with previously published LPLD events. We determined that regional earthquakes can show similar waveform characteristics to LPLD events, underscoring the importance of distinguishing regional earthquake signals from LPLD events to ensure robust interpretation of reservoir deformation processes.

Publisher

Society of Exploration Geophysicists

Subject

Geochemistry and Petrology,Geophysics

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