Combination of the Levenberg–Marquardt and diferential evolution algorithms for the ftting of postseismic GPS time series

• Autorzy: Li Jingwei , Zhan Wei , Guo Bofeng , Li Shuiping , Guo Binghui

Identyfikatory

DOI

10.1007/s11600-021-00556-y

• Języki publikacji: EN

Abstrakty

EN

Postseismic global positioning system (GPS) time series are of fundamental importance for investigating the physical mechanisms of postseismic deformations, as well as the construction and maintenance of terrestrial reference frames. Particularly, methods for constructing accurate ftting models for such time series are critical. Based on the physical features of postseismic deformation models, we propose a new algorithm that combines the strengths of the Levenberg–Marquardt (LM) and dif ferential evolution (DE) algorithms, that is, the LM+DE algorithm. In this algorithm, the parameters are initialised by the constrained DE algorithm; the fnal parameters of the postseismic model are then solved by the LM algorithm. To validate the proposed method, DE, LM, and LM+DE were compared using synthetic and observational data from the 2011 Tohoku Earthquake. For all tests based on synthetic data, the LM+DE algorithm consistently converged to the global solution and the residual is small, regardless of how the independent parameter was varied. In the 2011 Tohoku earthquake, the parameters calculated by the LM+DE algorithm matched consistently for the global solution with a 100% passing rate after constraints were provided for the ratios of the initial relaxation time parameters. In contrast, the LM and DE algorithms individually achieved passing rates of only 22% and 1%, respectively. These results demonstrate that the proposed LM+DE algorithm efectively solves the initial estimate problem in the ftting of nonlinear postseismic models, and also ensures that the fts are mathematically optimal and consistent with physical reality.

Słowa kluczowe

EN

postseismic deformation; Levenberg-Marquardt; differential evolution algorithm; GPS time series

PL

deformacja posejsmiczna; Levenberg-Marquardt; algorytm ewolucji różnicowej; szeregi czasowe GPS

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 2
• Strony: 405--414
• Opis fizyczny: Bibliogr. 34 poz.

Twórcy

autor

Li Jingwei

• The First Monitoring and Application Center, China Earthquake Administration, Tianjin, China

autor

Zhan Wei

• The First Monitoring and Application Center, China Earthquake Administration, Tianjin, China

autor

Guo Bofeng

• The First Monitoring and Application Center, China Earthquake Administration, Tianjin, China
• School of Marine Science and Technology, Tianjin University, Tianjin, China

autor

Li Shuiping

• School of Civil Engineering, Hefei University of Technology, Hefei, Anhui, China

autor

Guo Binghui

• The First Monitoring and Application Center, China Earthquake Administration, Tianjin, China

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