Daily to Centennial Behavior of Aseismic Slip Along the Central Section of the North Anatolian Fault

R. Jolivet*, J. Jara, M. Dalaison, B. Rouet-Leduc, A. Özdemir, U. Dogan, Z. Çakir, S. Ergintav, P. Dubernet

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Slow, aseismic slip plays a crucial role in the initiation, propagation, and arrest of large earthquakes along active faults. In addition, aseismic slip controls the budget of elastic strain in the crust, hence the amount of energy available for upcoming earthquakes. The conditions for slow slip include specific material properties of the fault zone, pore fluid pressure, and geometrical complexities of the fault plane. Fine scale descriptions of aseismic slip at the surface and at depth are key to determine the factors controlling the occurrence of slow, aseismic versus rapid, seismic fault slip. We focus on the spatial and temporal distribution of aseismic slip along the North Anatolian Fault, the plate boundary accommodating the 2 cm/yr of relative motion between Anatolia and Eurasia. Along the eastern termination of the rupture trace of the 1944 M7.3 Bolu-Gerede earthquake lies a segment that slips aseismically since at least the 1950s. We use Sentinel 1 time series of displacement and GNSS data to provide a spatio-temporal description of the kinematics of fault slip. We show that aseismic slip observed at the surface is coincident with a shallow locking depth and that slow slip events with a return period of 2.5 years are restricted to a specific section of the fault. In the light of historical measurements, we discuss potential rheological implications of our results and propose a simple alternative model to explain the local occurrence of shallow aseismic slip at this location.

Orijinal dilİngilizce
Makale numarasıe2022JB026018
DergiJournal of Geophysical Research: Solid Earth
Basın numarası7
Yayın durumuYayınlandı - Tem 2023

Bibliyografik not

Publisher Copyright:
© 2023 The Authors.


The authors would like to thank Dr Harsha S. Bhat, Dr Cécile Lasserre, Pr. Pierre Dublanchet, and Pr. Dmitry Garagash for insightful discussions. The authors also warmly thank the associate editor Dr. Rachel Abercrombie, Dr. Chris Rollins, and an anonymous reviewer for their insightful comments. This project has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant 758210 for project Geo4D). Romain Jolivet acknowledges funding from the Institut Universitaire de France. B. Rouet‐Leduc acknowledges funding from the JSPS LEADER program, from NASA under the NSPIRES grant 80NSSC22K1282 and from the U.S. Department of State under the V‐Fund grand 19AQMM22P1265.

FinansörlerFinansör numarası
National Aeronautics and Space Administration80NSSC22K1282
U.S. Department of State19AQMM22P1265
European Research Council
Japan Society for the Promotion of Science
Institut universitaire de France
Horizon 2020758210, Geo4D

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