Journal
AGU ADVANCES
Volume 2, Issue 2, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021AV000395
Keywords
earthquake science; aftershock monitoring; distributed acoustic sensing
Categories
Funding
- NSF CAREER Award [1848166]
- NSF GMG Center at Caltech
- Braun Trust
- USTC Research Funds of the Double First-Class Initiative [YD2080002006]
- Division Of Earth Sciences
- Directorate For Geosciences [1848166] Funding Source: National Science Foundation
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Utilizing optical fibers for seismic monitoring allows for rapid response and critical data acquisition. Research shows that DAS technology successfully detected more aftershocks after the Ridgecrest earthquake. The widespread fiber optic networks globally provide great potential for high-resolution aftershock monitoring.
Rapid seismic deployments after major earthquakes often produce critical data for characterizing postseismic processes. Taking advantage of pre-existing optical fibers, the recently emerging distributed acoustic sensing (DAS) technology can quickly establish ultra-dense seismic arrays after the mainshocks. Here we present the first example of such a rapid-response experiment using four telecommunication fiber optic cables near the 2019 M 7.1 Ridgecrest earthquake in California. By applying template matching to the Ridgecrest DAS array, we detected 6 times more aftershocks than the standard catalog within the three-month period. The enhanced catalog reveals abundant aftershocks on multiple crosscutting faults near the epicenters of the mainshock and the M 6.4 foreshock. Given the widespread fiber optic networks around the world, DAS has the potential to deliver fast and high-resolution aftershock monitoring and promote better understanding of earthquake physics.
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