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Numerical tests for effects of various parameters in niching genetic algorithm applied to regional waveform inversion 被引量:1
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作者 Cong Li Jianshe Lei 《Earthquake Science》 2014年第5期541-551,共11页
In this paper,we focus on the influences of various parameters in the niching genetic algorithm inversion procedure on the results,such as various objective functions,the number of the models in each subpopulation,and... In this paper,we focus on the influences of various parameters in the niching genetic algorithm inversion procedure on the results,such as various objective functions,the number of the models in each subpopulation,and the critical separation radius.The frequency-waveform integration(F-K) method is applied to synthesize three-component waveform data with noise in various epicentral distances and azimuths.Our results show that if we use a zero-th-lag cross-correlation function,then we will obtain the model with a faster convergence and a higher precision than other objective functions.The number of models in each subpopulation has a great influence on the rate of convergence and computation time,suggesting that it should be obtained through tests in practical problems.The critical separation radius should be determined carefully because it directly affects the multiextreme values in the inversion.We also compare the inverted results from full-band waveform data and surfacewave frequency-band(0.02-0.1 Hz) data,and find that the latter is relatively poorer but still has a higher precision,suggesting that surface-wave frequency-band data can also be used to invert for the crustal structure. 展开更多
关键词 Niching genetic algorithm waveforminversion Crustal velocity structure
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A New Earthquake Location Method Based on the Waveform Inversion 被引量:3
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作者 Hao Wu Jing Chen +1 位作者 Xueyuan Huang Dinghui Yang 《Communications in Computational Physics》 SCIE 2018年第1期118-141,共24页
In this paper,a new earthquake location method based on the waveform inversion is proposed.As is known to all,the waveform misfit function under the L2 measure is suffering from the cycle skipping problem.This leads t... In this paper,a new earthquake location method based on the waveform inversion is proposed.As is known to all,the waveform misfit function under the L2 measure is suffering from the cycle skipping problem.This leads to a very small convergence domain of the conventional waveform based earthquake location methods.In present study,by introducing and solving two simple sub-optimization problems,we greatly expand the convergence domain of the waveform based earthquake location method.According to a large number of numerical experiments,the new method expands the range of convergence by several tens of times.This allows us to locate the earthquake accurately even from some relatively bad initial values. 展开更多
关键词 Computational seismology inverse theory waveforminversion earthquake location
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