Reconstruction of Semblance Section for the Crust/Mantle Reflection Structure by Wide‐Angle Seismic Data

Zhang, Zhongjie; Qin, Yipeng; Chen, Yun; Zhang, Chaoying; Sun, Shilong; Zhao, Bing; Yifeng, Liu; Zhenkuan, Liu

doi:10.1002/cjg2.517

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…A complete image is formed by stacking results for individual gathers. Milkereit (1987) and Zhang et al (2004) divided wide-angle profiles into overlapping, narrow-aperture spatial windows, then used the semblance of the localized slant stacks of those windows to identify coherent arrivals in the time-space domain for inputting a diffraction-stack migration. In this approach, contributions to the migrated image are restricted to input samples, which arrive with the travel times, and ray parameters predicted for diffraction through a velocity model.…”

Section: Figurementioning

confidence: 99%

Crustal wide-angle reflection imaging along Lianxian-Gangkou profile in Guangdong province, China

et al. 2009

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A 400 km-long wide-angle seismic experiment along Lianxian-Gangkou profile in South China was carried out to study contact relationship between southeast continental margin of Yangtze block and northwest continental margin of Cathaysia block. We reconstructed crustal wide-angle reflection structure by the depth-domain pre-stack migration and the crustal velocity model constructed from the traveltime fitting. The wide-angle reflection section shows different reflection (from crystalline basement and Moho) pattern beneath the Yangtze and Cathaysia blocks, and suggests the Wuchuan-Sihui fault is the boundary between them. A cluster of well-developed reflections on Moho and in its underlying topmost mantle probably comes from alternative thin layers, which may be seismic signature of strong interaction between crust and mantle in the tectonic environment of lithosphere extension.

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Section: Figurementioning

confidence: 99%

Crustal wide-angle reflection imaging along Lianxian-Gangkou profile in Guangdong province, China

et al. 2009

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“…Geological models used in deep seismic exploration usually consist of layered and blocked homogeneous media, and are of large sizes [24] . For ensuring calculation accuracy, we need to divide the large models into a lot of small elements, resulting in much CPU time spent on calculating travel time fields in them.…”

Section: Principle Of the Double-grid Algorithmmentioning

confidence: 99%

“…Layered and blocked homogeneous models on a large scale are usually used in deep seismic exploration [24] . Since the wide-angle reflection data are required to be quickly and reliably interpreted, it is necessary to develop ray tracing methods for quickly and accurately calculating travel times.…”

Section: Introductionmentioning

confidence: 99%

Double-Grid Algorithm for Calculating Travel Times of Wide-Angle Reflection Waves

Zhao¹,

Ding²

2005

Chinese J. Geophys.

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Layered and blocked homogeneous models are usually used in interpreting wide‐angle reflection data to forward model travel times and ray paths of wide‐angle reflection waves when we research crust structure by deep seismic exploration. In order to make the model approach the Earth, the size of the model has to be large. On the other hand, for obtaining accurate travel times and rays calculated with minimum travel time tree algorithm, the model elements have to be small, and thus the efficiency of calculation is decreased. In this paper, a double‐grid scheme is employed in calculation of travel times and ray paths in order to fast and reliably interpret deep sounding data. In the double‐grid algorithm, the model is covered with sparse and dense grids. Nodes in the sparse gird are calculated in the same way as in the single‐grid algorithm; as for the ones in the dense gird, they are done only if they are in the neighborhoods of source and geophone nodes, and the ones where velocity gradients are not zero, and the propagation areas of secondary waves are larger for interface boundary nodes than for the ones within homogenous media. The numerical example shows that the double‐grid algorithm has much higher calculation efficiency than the single‐gird one under the same accuracy condition for large layered and blocked homogenous models.

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“…55 Ma have resulted in substantial deformation and uplift within the interior of the Tibetan Plateau, together with the outward expansion of the plateau along its margins (e.g., Molnar and Tapponnier, 1975;Tapponnier et al, 2001;Yin, 2000;Yin, 2010;;Zhao et al, 2010;Zuza et al, 2018;Xiong et al, 2022). This collision has significantly impacted both the topography and climate of the surrounding regions (Zhang et al, 2004). However, the precise manner in which the Tibetan crust accommodates the convergence of the Indian and Eurasian plates, leading to the development of the Tibetan Plateau, remains a subject of intense debate (e.g., Cheng et al, 2019;Clark and Royden, 2000;Yin and Harrison, 2000;Tapponnier et al, 2001;van Hinsbergen et al, 2011;van Hinsbergen et al, 2012;Yakovlev and Clark, 2014;Ingalls and Stedman, 2016;Zuza et al, 2016;Zheng et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Understanding the geometric and kinematic characteristics of the crustal structure in this region is essential for deciphering the deep interrelation between the Tibetan Plateau and the Eurasian plate. This knowledge holds the potential to significantly enhance our comprehension of continental tectonics (Yin et al, 2002;Molnar, 1988;Zhang et al, 2004;Zhou et al, 2006;Yin, 2010;Lease et al, 2012;Craddock et al, 2011;Craddock et al, 2014;Zuza et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Crustal structure and deformation mechanism of the western northeast Tibetan Plateau

Wang,

Xiong,

et al. 2023

Front. Earth Sci.

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The collision between the Indian and Eurasian plates continues to drive significant deformation and uplift within the interior of the Tibetan Plateau, together with its outward expansion along the margins. In particular, the North Qilian Shan fold-thrust belt (NQLS) and the Hexi Corridor basins (HXBS) represent the northernmost region of the northeastern Tibetan Plateau. This area serves as a natural laboratory for deciphering mechanisms of crustal deformation and thickening along the plateau’s margins. Specifically, the northeastern Tibetan Plateau has been attributed to 1) southward underthrusting of the Asian lithosphere, 2) distributed shortening and crustal thickening, 3) vertical inflation of the Tibetan crust due to mid-lower crustal channel flow, and 4) intracontinental subduction facilitated by large-scale strike–slip faults. The exact mechanism underlying the most concentrated convergent stress in the western segment of NQLS–HXBS remains a subject of debate. To address this uncertainty, we gathered seismic data along a 130-km-long linear array that extends northward from NQLS, traversing the Jiuquan Basin and reaching the Huahai Basin. Our analysis, conducted through the receiver function method, reveals intriguing findings. The Moho depth deepens from 45–50 km beneath the Huahai Basin to 55–60 km beneath NQLS. Notably, a double Moho structure emerged, marked by a distinctive near-flat positive amplitude at a depth of 45–50 km beneath NQLS within a distance of 0–50 km. Our study presents a comprehensive analysis of the crust-scale deformation mechanism, shedding light on the following key aspects: 1) the development of a decollement at 12–20 km depth decoupling the upper and lower crust; 2) deformation of the upper crust occurring through south-dipping brittle thrust faults, while the lower crust features imbricate structures and duplexes; 3) evidence pointing to the underthrusting of the Beishan Block beneath NQLS, indicated by the double Moho beneath NQLS; and 4) the formation of a Moho ramp beneath the Jiuquan Basin, facilitating the transfer of shortening stress from beneath NQLS and HXBS to the north. In the context of the western segment of NQLS and HXBS, our speculation is that coupled distributed shortening and Beishan Block subduction beneath NQLS work in tandem to accommodate crustal deformation.

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Reconstruction of Semblance Section for the Crust/Mantle Reflection Structure by Wide‐Angle Seismic Data

Cited by 7 publications

References 6 publications

Crustal wide-angle reflection imaging along Lianxian-Gangkou profile in Guangdong province, China

Crustal wide-angle reflection imaging along Lianxian-Gangkou profile in Guangdong province, China

Double-Grid Algorithm for Calculating Travel Times of Wide-Angle Reflection Waves

Crustal structure and deformation mechanism of the western northeast Tibetan Plateau

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