IGGCAS OpenIR  > 地球与行星物理院重点实验室
Structure-preserving modeling of teleseismic wavefield using symplectic SEM-FK hybrid method
Li BingFei1,2,3; Dong XingPeng4; Li XiaoFan1,2; Si JieGe5
2019-11-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume62Issue:11Pages:4339-4352
AbstractTeleseismic full-waveform tomography can obtain high resolution velocity structure of upper mantle, and even the structure of mantle transition zone beneath the study area. It has been a vital tool in probing the Earth's internal structure and dynamic process. This method is based on effective forward simulation of seismic wavefield, which requires forward-modeling methods with high accuracy and long-term stability. Under this background, we present a structure-preserving scheme based on symplectic geometric theory, which is specially tailored for teleseismic wave modeling. The spectral element method (SEM) is used to discretize the study area. Without the consideration of the dissipation term, the discretized ordinary differential equation is transformed into a Hamiltonian system, which can be solved numerically by the symplectic-preserving partitioned Runge-Kutta (PRK) method. After adding an extra spatial discretization term into the PRK scheme, we developed a new symplectic scheme with fourth order temporal accuracy. We call the spatial-temporal discretized scheme symplectic SEM (SSEM). We combine SSEM with FK method, which calculates plane wave propagation in one-dimensional layered media. After that, we construct a hybrid method (SSEM-FK) to efficiently calculate teleseismic elastic wave propagation in regional heterogeneous model. Numerical experiments show that SSEM-FK can accurately simulate the propagation of high-frequency teleseismic wavefield in the study area. The advantage of this method in computational efficiency forms the foundation for high-efficient and high-accurate teleseismic full-waveform tomography.
KeywordSymplectic scheme Elastic wave equation Teleseismic wavefield modeling Spectral element method
DOI10.6038/cjg2019M0688
WOS KeywordSPECTRAL-ELEMENT METHOD ; HETEROGENEOUS MEDIA ; 2 KINDS ; DIFFERENCE ; SCHEME ; PROPAGATION ; TIME ; SEISMOGRAMS ; TOMOGRAPHY ; INVERSION
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000495446500021
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95702
Collection地球与行星物理院重点实验室
Corresponding AuthorDong XingPeng
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.China Earthquake Disaster Prevent Ctr, Beijing 100029, Peoples R China
4.Tsinghua Univ, Dept Math Sci, Beijing 100084, Peoples R China
5.3rd Res Inst CETC, Beijing 100015, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li BingFei,Dong XingPeng,Li XiaoFan,et al. Structure-preserving modeling of teleseismic wavefield using symplectic SEM-FK hybrid method[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(11):4339-4352.
APA Li BingFei,Dong XingPeng,Li XiaoFan,&Si JieGe.(2019).Structure-preserving modeling of teleseismic wavefield using symplectic SEM-FK hybrid method.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(11),4339-4352.
MLA Li BingFei,et al."Structure-preserving modeling of teleseismic wavefield using symplectic SEM-FK hybrid method".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.11(2019):4339-4352.
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