Aftershock Study of the 2014 Duncan, Arizona Mw = 5.2 Earthquake Using Local Seismic Data
Abstract
On June 29, 2014, at 4:59:35.4 UTC, a Mw = 5.2 earthquake struck near Duncan, just west of the Arizona-New Mexico border. This event is the strongest instrumentally recorded earthquake yet in southeastern Arizona, which experiences low seismicity due to slow roughly east-west-trending extension in the transition zone between the Basin and Range region and the stable Colorado Plateau to the north. An approximately 15-by-20-km-wide temporary network of four short-period and two broadband seismometers was deployed to study the aftershock sequence, as the nearest permanent stations are located over one hundred kilometers away. We used the BRTT Antelope "dbdetect" and "dbgrassoc" tools to obtain locations for about 10,000 aftershocks from July 8 through August 28, 2014, when at least four local stations were operational. Our preliminary results suggest that most of the activity occurred in a north-south-elongated area, within 32.57-32.64° N and 109.11-109.15° W and about 4-7 km deep. We have not observed distinct event migrations, but found several event clusters within the aftershock region that were active for short time periods, implying a complex pattern of strain release. The aftershock sequence has continued for more than two years after the mainshock event.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.S53A2809D
- Keywords:
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- 7209 Earthquake dynamics;
- SEISMOLOGYDE: 7215 Earthquake source observations;
- SEISMOLOGYDE: 7223 Earthquake interaction;
- forecasting;
- and prediction;
- SEISMOLOGY