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Analysis of the 2012–2013 Torreperogil-Sabiote seismic swarm

Research Authors
Hamdache, M., Peláez, J.A., Henares, J., Damerdji, Y., and Sawires, R.
Research Abstract

This study analyses the temporal clustering, spatial clustering, and statistics of the 2012–2013 Torreperogil-Sabiote (southern Spain) seismic swarm. During the swarm, more than 2200 events were located, mostly at depths of 2–5 km, with magnitude event up to mbLg
3.9 (Mw 3.7). On the basis of daily activity rate, three main temporal phases are identified and
analysed. The analysis combines different seismological relationships to improve our understanding of the physical processes related to the swarm’s occurrence. Each temporal phase is characterized by its cumulative seismic moment. Using several different approaches,
we estimate a catalog completeness magnitude of c
m ≅1.5. The maximum likelihood b-value estimates for each swarm phase are 1.11 ± 0.09, 1.04 ± 0.04, and 0.90 ± 0.04, respectively. To test the hypothesis that a b-value decrease is a precursor to a large event, westudy temporal variations in b-value using overlapping moving windows. A relationship can be inferred between change in b-value and the regime style of the rupture. b-values are indicators of the stress regime, and influence the size of ruptures. The fractal dimension 2 D is used to perform spatial analysis. Cumulative gamma and beta functions are used to analyse the behaviour of inter-event distances during the earthquake sequence.

Research Department
Research Journal
Physics and Chemistry of the Earth
Research Member
Research Publisher
NULL
Research Rank
1
Research Vol
NULL
Research Website
https://www.sciencedirect.com/science/article/pii/S1474706516000061
Research Year
2016
Research Pages
DOI: 10.1016/j.pce.2016.01.003.