Detailed spatiotemporal evolution of microseismicity and repeating earthquakes following the 2012 <i>M<sub>w</sub></i> 7.6 Nicoya earthquake

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  • Dongdong Yao
    Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia USA
  • Jacob I. Walter
    Oklahoma Geological Survey University of Oklahoma Norman Oklahoma USA
  • Xiaofeng Meng
    Department of Earth and Space Sciences University of Washington Seattle Washington USA
  • Tiegan E. Hobbs
    Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia USA
  • Zhigang Peng
    Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia USA
  • Andrew V. Newman
    Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta Georgia USA
  • Susan Y. Schwartz
    Department of Earth and Planetary Sciences Santa Cruz California USA
  • Marino Protti
    Observatorio Vulcanológico y Sismológico de Costa Rica Universidad Nacional Heredia Costa Rica

書誌事項

公開日
2017-01
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016jb013632
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>We apply a waveform matching technique to obtain a detailed earthquake catalog around the rupture zone of the 5 September 2012 moment magnitude 7.6 Nicoya earthquake, with emphasis on its aftershock sequence. Starting from a preliminary catalog, we relocate ~7900 events using TomoDD to better quantify their spatiotemporal behavior. Relocated aftershocks are mostly clustered in two groups. The first is immediately above the major coseismic slip patch, partially overlapping with shallow afterslip. The second one is 50 km SE to the main shock nucleation point and near the terminus of coseismic rupture, in a zone that exhibited little resolvable afterslip. Using the relocated events as templates, we scan through the continuous recording from 29 June 2012 to 30 December 2012, detecting approximately 17 times more than template events. We find 190 aftershocks in the first half hour following the main shock, mostly along the plate interface. Later events become more scattered in location, showing moderate expansion in both along‐trench and downdip directions. From the detected catalog we identify 53 repeating aftershock clusters with mean cross‐correlation values larger than 0.9, and indistinguishably intracluster event locations, suggesting slip on the same fault patch. Most repeating clusters occurred within the first major aftershock group. Very few repeating clusters were found in the aftershock grouping along the southern edge of the Peninsula, which is not associated with substantial afterslip. Our observations suggest that loading from nearby afterslip along the plate interface drives spatiotemporal evolution of aftershocks just above the main shock rupture patch, while aftershocks in the SE group are to the SE of the observed updip afterslip and poorly constrained.</jats:p>

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