Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 224, Issue 3, Pages 2016-2027Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggaa560
Keywords
Creep and deformation; Satellite geodesy; Seismic cycle; Earthquake hazards
Categories
Funding
- MISTI Grant from MIT
- Scientific and Technological Research Council of Turkey (TUBITAK)
- TUBITAK [113Y102, 117Y278]
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The study found that post-seismic afterslip on the fault resulting from the 1999 Izmit Earthquake in Turkey continues for about 20 years, with varying shallow creep observed near the epicenter through high-density GPS observations. The results suggest shallower apparent locking depths and ongoing afterslip at depth on the coseismic fault following the earthquake.
In order to better assess earthquake hazards, it is vital to have a better understanding of the spatial and temporal characteristics of fault creep that occur on ruptured faults during the period following major earthquakes. towards this end, we use new far-field GPS velocities from continuous stations (extending similar to 50-70 km from the fault) and updated near-fault GPS survey observations, with high temporal and spatial density, to constrain active deformation along the M-w 7.4,1999 Izmit, Turkey Earthquake fault. We interpret and model deformation as resulting from post-seismic afterslip on the coseismic fault. In the broadest sense, our results demonstrate that logarithmically decaying post-seismic afterslip continues at a significant level 20 yr following 1999 Earthquake. Elastic models indicate substantially shallower apparent locking depths at present than prior to the 1999 Earthquake, consistent with continuing afterslip on the coseismic fault at depth. High-density, near-fault GPS observations indicate shallow creep on the upper 1-2 km of the coseismic fault, with variable rates, the highest and most clearly defined of which reach similar to 12 mm yr(-1) (10-15 mm yr(-1), 95 per cent c.i.) near the epicentre between 2014-2016. This amounts to similar to half the long-term slip deficit rate.
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