Abstract
We present an adaptive multistart Gauss–Newton approach (AMGNA) to inverse earthquake source parameters with multiple geodetic data sets. The AMGNA can be combined with uniform and nonuniform sampling schemes to generate initial parameters. The AMGNA searches for the improved solution with an adaptively determined number of initial parameters based on a given stable level represented by a target probability; this process involves a first-order approximate uncertainty calculation and performs a joint inversion involved variance component estimation. We test the efficiency and reliability of the AMGNA with synthetic global positioning system and interferometric synthetic aperture radar data and apply the proposed approach to the 2009 Mw 6.3 L’Aquila earthquake and 2017 Mw 6.6 Bodrum–Kos earthquake. The results show that the AMGNA can retrieve well the designed source parameters by several simulated cases and estimate source parameters and uncertainties comparable to those of previous studies for real applications. The AMGNA can quickly estimate the source parameters and uncertainties within 0.5–25 min using six processes in parallel computing. Considering the easily implemented property of the nonuniform sampling scheme, our algorithm has potential applications in the fast and automatic inversion of earthquake source parameters.
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The data sets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work is supported by the National Natural Science Foundation of China (Grant No. 41574002), the State Key Program of National Natural Science Foundation of China (Grant No. 41431069) and the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 41721003).
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Yingwen Zhao performed the experiments, wrote and revised the manuscript; Caijun Xu designed the study, analyzed the experimental results and revised the manuscript.
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Zhao, Y., Xu, C. Adaptive multistart Gauss–Newton approach for geodetic data inversion of earthquake source parameters. J Geod 94, 17 (2020). https://doi.org/10.1007/s00190-020-01353-z
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DOI: https://doi.org/10.1007/s00190-020-01353-z