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Spatio-temporal evolution of the 2011 Prague, Oklahoma aftershock sequence revealed using subspace detection and relocation

Geophysical Research Letters

By:
, , , , and
https://doi.org/10.1002/2017GL072944

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Abstract

The 6 November 2011 Mw 5.7 earthquake near Prague, Oklahoma is the second largest earthquake ever recorded in the state. A Mw 4.8 foreshock and the Mw 5.7 mainshock triggered a prolific aftershock sequence. Utilizing a subspace detection method, we increase by fivefold the number of precisely located events between 4 November and 5 December 2011. We find that while most aftershock energy is released in the crystalline basement, a significant number of the events occur in the overlying Arbuckle Group, indicating that active Meeker-Prague faulting extends into the sedimentary zone of wastewater disposal. Although the number of aftershocks in the Arbuckle Group is large, comprising ~40% of the aftershock catalog, the moment contribution of Arbuckle Group earthquakes is much less than 1% of the total aftershock moment budget. Aftershock locations are sparse in patches that experienced large slip during the mainshock.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Spatio-temporal evolution of the 2011 Prague, Oklahoma aftershock sequence revealed using subspace detection and relocation
Series title:
Geophysical Research Letters
DOI:
10.1002/2017GL072944
Volume:
44
Issue:
14
Year Published:
2017
Language:
English
Publisher:
American Geophysical Union
Contributing office(s):
Geologic Hazards Science Center
Description:
10 p.
First page:
7149
Last page:
7158