Frequency domain elastic wave modeling for polygonal topography using rotated average derivative diference operators

• Autorzy: Li Zheng , Chen Jing-Bo , Cao Jian

Identyfikatory

DOI

10.1007/s11600-020-00481-6

• Języki publikacji: EN

Abstrakty

EN

Modeling of seismic wave propagation in areas with irregular topography is an important topic in the feld of seismic exploration. As a popular numerical method for seismic modeling, the fnite diference method is nontrivial to consider the irregular free surface. There have been extensive studies on the time-domain fnite diference simulations with irregular topography; however, the frequency-domain fnite diference simulation considering irregular topography is relatively less studied. The average-derivative approach is an optimal numerical simulation scheme in the frequency domain, which can produce accurate modeling results at a relatively low computational cost. Nevertheless, this approach can only deal with the modeling problems with a fat free surface. To address this issue, we design a new frequency-domain fnite diference scheme by introducing the polygonal representation of topography into the average-derivative method. The irregular topog raphy is represented by line segments with various slopes. An extension of the conventional average-derivative diference operator in the local rotated coordinate system is used for formulating the spatial derivatives aligned with the topographic line segments. As a result, new average-derivative diference schemes are obtained for irregular topography. In this way, the average-derivative optimal method is generalized to the model with irregular topography. Numerical examples show the efectiveness of the presented method.

Słowa kluczowe

EN

irregular topography; frequency-domain modeling; rotated coordinate system; average-derivative difference scheme

PL

topografia nieregularna; modelowanie w dziedzinie częstotliwości; obrócony układ współrzędnych

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2020
• Tom: Vol. 68, no. 5
• Strony: 1387--1409
• Opis fizyczny: Bibliogr. 23 poz.

Twórcy

autor

Li Zheng

• Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
• Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China
• University of Chinese Academy of Sciences, Beijing 100049, China

autor

Chen Jing-Bo

• Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
• Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China
• University of Chinese Academy of Sciences, Beijing 100049, China

autor

Cao Jian

• Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
• Innovation Academy for Earth Science, Chinese Academy of Sciences, Beijing 100029, China

Bibliografia

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