期刊
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
卷 105, 期 2B, 页码 1153-1164出版社
SEISMOLOGICAL SOC AMER
DOI: 10.1785/0120140172
关键词
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资金
- NSF [EAR-0911677]
- Chinese participants
- National Natural Science Foundation of China [41204001, 41274037, 41304014]
- CMONOC project
- Surveying and Mapping Basic Research Fund of Earth Space Environment and Geodetic Measurement Laboratory in Wuhan University [130104]
- Directorate For Geosciences
- Division Of Earth Sciences [GRANTS:14026061] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1261833] Funding Source: National Science Foundation
Static (low-rate, 30 s) and kinematic (high-rate, 1 s) Global Positioning System solutions are employed to investigate the near-field coseismic and early post-seismic deformation associated with the 5 January 2013 Craig M-w 7.5 earthquake. Based on the static solutions, the coseismic slip distribution has an average slip of similar to 6 m, a geodetic moment M-0 of 1.5 x 10(20) N.m, and a magnitude M-w of 7.4. A comparison of the static and kinematic results indicates that early (first 4 days) postseismic deformation was small compared to the coseismic deformation. The postseismic transient can be characterized by a logarithmic decay function with an average decay time constant of about 56 days. Substantial postseismic deformation is observed over the first similar to 1.6 yrs of the earthquake and can be explained by afterslip on an adjacent segment of the fault to the southeast of the main coseismic rupture. Additional study will be needed to confirm whether afterslip is indeed the dominant mechanism causing postseismic motions or if another mechanism is also active.
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