Dynamics of Izmit Earthquake Postseismic Deformation and Loading of the Duzce Earthquake Hypocenter

2002 ◽  
Vol 92 (1) ◽  
pp. 172-193 ◽  
Author(s):  
E. H. Hearn
Keyword(s):  
Postseismic Deformation ◽  
Izmit Earthquake ◽  
Earthquake Hypocenter

scholarly journals Adjoint-based direct data assimilation of GNSS time series for optimizing frictional parameters and predicting postseismic deformation following the 2003 Tokachi-oki earthquake

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Masayuki Kano ◽  
Shin’ichi Miyazaki ◽  
Yoichi Ishikawa ◽  
Kazuro Hirahara
Keyword(s):  
Time Series ◽  
Data Assimilation ◽  
Evaluation Method ◽  
Temporal Evolution ◽  
Recovery Process ◽  
Postseismic Deformation ◽  
Coseismic Slip ◽  
Megathrust Earthquakes ◽  
Spatio Temporal ◽  
Gnss Time Series

Abstract Postseismic Global Navigation Satellite System (GNSS) time series followed by megathrust earthquakes can be interpreted as a result of afterslip on the plate interface, especially in its early phase. Afterslip is a stress release process accumulated by adjacent coseismic slip and can be considered a recovery process for future events during earthquake cycles. Spatio-temporal evolution of afterslip often triggers subsequent earthquakes through stress perturbation. Therefore, it is important to quantitatively capture the spatio-temporal evolution of afterslip and related postseismic crustal deformation and to predict their future evolution with a physics-based simulation. We developed an adjoint data assimilation method, which directly assimilates GNSS time series into a physics-based model to optimize the frictional parameters that control the slip behavior on the fault. The developed method was validated with synthetic data. Through the optimization of frictional parameters, the spatial distributions of afterslip could roughly (but not in detail) be reproduced if the observation noise was included. The optimization of frictional parameters reproduced not only the postseismic displacements used for the assimilation, but also improved the prediction skill of the following time series. Then, we applied the developed method to the observed GNSS time series for the first 15 days following the 2003 Tokachi-oki earthquake. The frictional parameters in the afterslip regions were optimized to A–B ~ O(10 kPa), A ~ O(100 kPa), and L ~ O(10 mm). A large afterslip is inferred on the shallower side of the coseismic slip area. The optimized frictional parameters quantitatively predicted the postseismic GNSS time series for the following 15 days. These characteristics can also be detected if the simulation variables can be simultaneously optimized. The developed data assimilation method, which can be directly applied to GNSS time series following megathrust earthquakes, is an effective quantitative evaluation method for assessing risks of subsequent earthquakes and for monitoring the recovery process of megathrust earthquakes.

scholarly journals Coseismic and early post-seismic slip associated with the 1999 Izmit earthquake (Turkey), from SAR interferometry and tectonic field observations

2003 ◽  
Vol 155 (1) ◽  
pp. 93-110 ◽  
Author(s):  
Ziyadin Çakir ◽  
Jean-Bernard de Chabalier ◽  
Rolando Armijo ◽  
Bertrand Meyer ◽  
Aykut Barka ◽  
...  
Keyword(s):  
Sar Interferometry ◽  
Field Observations ◽  
Seismic Slip ◽  
Izmit Earthquake

Inference of postseismic deformation mechanisms of the 1923 Kanto earthquake

2006 ◽  
Vol 111 (B5) ◽  
pp. n/a-n/a ◽  
Author(s):  
Fred F. Pollitz ◽  
Marleen Nyst ◽  
Takuya Nishimura ◽  
Wayne Thatcher
Keyword(s):  
Deformation Mechanisms ◽  
Postseismic Deformation ◽  
Kanto Earthquake

Coseismic and postseismic deformation due to the 2007M5.5 Ghazaband fault earthquake, Balochistan, Pakistan

2015 ◽  
Vol 42 (9) ◽  
pp. 3305-3312 ◽  
Author(s):  
H. Fattahi ◽  
F. Amelung ◽  
E. Chaussard ◽  
S. Wdowinski
Keyword(s):  
Postseismic Deformation

Postseismic deformation following the 1989 (M= 7.1) Loma Prieta, California, earthquake

1994 ◽  
Vol 99 (B7) ◽  
pp. 13757-13765 ◽  
Author(s):  
J. C. Savage ◽  
M. Lisowski ◽  
J. L. Svarc
Keyword(s):  
Postseismic Deformation ◽  
Loma Prieta
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