NA-GCAP: A New Full Moment Tensor Inversion Method Based on the Renewed GRTM and NA Method

Wen, Jian1,2,3; Hu, Feng1,2,3; Chen, Xiaofei4,5

2023-11-01

10.1785/0220220259

SEISMOLOGICAL RESEARCH LETTERS   影响因子和分区

0895-0695

1938-2057

Moment tensor inversion plays a crucial role in determining earthquake types, magnitude, and source geometry. Compared to polarity and amplitude methods, full-waveform approaches provide more comprehensive constraints on the complex full moment tensor (FMT). In this study, we propose a novel FMT inversion method named neighborhood algorithm-generalized cut-and-paste (NA-GCAP) method. Similar to the "cut-and-paste" method, our approach divides seismograms into Pnl and surface-wave segments. To enhance inversion efficiency, we employ the NA in conjunction with a newly developed strategy for efficient Green's functions computation based on the renewed fast generalized reflection and transmission method (GRTM). Our method requires only a single forward computation and stores ten Green's functions, significantly improving computational efficiency. We validate the robustness of our approach through synthetic tests using a velocity model perturbed by 5% relative to the input model. Furthermore, we apply the NA-GCAP method to the 2019 Changning earthquake sequence comprising 16 earthquakes, where twelve events exhibit double-couple (DC) components larger than 0.95, indicating a simple dislocation source, and four events display significant non-DC components. Our results align well with the previous studies and demonstrate the potential for widespread application to other earthquake sequences in the future.

SCI ; EI

英语

其他

National Key R&D Program of China[2018YFC1503400] ; National Natural Science Foundation of China["41974042","42074049"] ; University of Science and Technology of China (USTC) Research Funds of the Double First-Class Initiative[YD2080002009] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2023471]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:001103842500002

SEISMOLOGICAL SOC AMER

20240515457438

Computational efficiency ; Surface waves ; Tensors

Seismology:484 ; Algebra:921.1

GEOSCIENCES

Web of Science

1.Univ Sci & Technol China, Lab Seismol & Phys Earths Interior, Hefei, Peoples R China
2.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China
3.Univ Sci & Technol China, Natl Geophys Observ Mengcheng, Hefei, Anhui, Peoples R China
4.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
5.Southern Univ Sci & Technol, Guangdong Prov Key Lab Geophys High resolut Imagin, Shenzhen, Guangdong, Peoples R China

Wen, Jian,Hu, Feng,Chen, Xiaofei. NA-GCAP: A New Full Moment Tensor Inversion Method Based on the Renewed GRTM and NA Method[J]. SEISMOLOGICAL RESEARCH LETTERS,2023,94(6):2775-2786.

Wen, Jian,Hu, Feng,&Chen, Xiaofei.(2023).NA-GCAP: A New Full Moment Tensor Inversion Method Based on the Renewed GRTM and NA Method.SEISMOLOGICAL RESEARCH LETTERS,94(6),2775-2786.

Wen, Jian,et al."NA-GCAP: A New Full Moment Tensor Inversion Method Based on the Renewed GRTM and NA Method".SEISMOLOGICAL RESEARCH LETTERS 94.6(2023):2775-2786.