Present GPS velocity field along 1999 Izmit rupture zone: Evidence for continuing afterslip 20 yr after the earthquake

Seda Özarpaci, Uǧur Doǧan*, Semih Ergintav, Ziyadin Çakir, Alpay Özdemir, Michael Floyd, Robert Reilinger

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13 Atıf (Scopus)

Özet

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 ~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 Mw 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 ~12 mmyr-1 (10-15 mmyr-1, 95 per cent c.i.) near the epicentre between 2014-2016. This amounts to ~half the long-term slip deficit rate.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)2016-2027
Sayfa sayısı12
DergiGeophysical Journal International
Hacim224
Basın numarası3
DOI'lar
Yayın durumuYayınlandı - 1 Mar 2021

Bibliyografik not

Publisher Copyright:
© The Author(s) 2020.

Finansman

General Directory of Land Registry and Cadaster and the General Directorate of Mapping provided CORS-TR stations RINEX files and Kocaeli General Directorate of Water and Sewerage Administration (ISU), Sakarya General Directorate of Water and Sewerage Administration (SASKI) and Cayirova Municipality provided cGPS RINEX files for this study. We would like to thank Robert King for his help with GPS data processing and analysis, especially the survey observations. We are grateful to Roland Bürgmann and an anonymous reviewer for thorough and constructive reviews that substantially improved the paper. We used GMT for the figures (Wessel et al. 2013). MIT participation in this study was supported by a MISTI Grant from MIT. The first author of this paper was also awarded '2214-A Abroad Research Scholarship' by The Scientific and Technological Research Council of Turkey (TUBITAK) and concluded her research at MIT. This study was also supported by TUBITAK 1001 project no. 113Y102 and TUBITAK 2507 project no. 117Y278.

FinansörlerFinansör numarası
Cayirova Municipality
Kocaeli General Directorate of Water and Sewerage Administration
MISTI
Roland Bürgmann
SASKI
Sakarya General Directorate of Water and Sewerage Administration
TUBITAK 1001113Y102, 2507, 117Y278
Massachusetts Institute of Technology
Illinois State University
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

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