Converted‐Wave Static Correction Method for Thick Weathering Area

Li, YAN-Peng; Ma, Zaitian; Sun, Peng; Yang, Haishen

doi:10.1002/cjg2.1702

Cited by 20 publications

(1 citation statement)

References 16 publications

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“…One category is data-based methods, including the common receiver point (CRP) stack-power optimization method (Cary and Eaton, 1993) and Monte-Carlo simulated annealing (Eaton et al, 1991). Where geological structures are not complex, the CRP stackpower optimization method gives good results, whereas, Monte-Carlo simulated annealing gives a fairly good solution but is computationally expensive (Li et al, 2012).…”

Section: Introductionmentioning

confidence: 98%

Estimation of S-wave static corrections using CMP cross-correlation of surface waves

Askari

Ferguson

Isaac

et al. 2015

Journal of Applied Geophysics

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Section: Introductionmentioning

confidence: 98%

Estimation of S-wave static corrections using CMP cross-correlation of surface waves

Askari

Ferguson

Isaac

et al. 2015

Journal of Applied Geophysics

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A quasi-linear structure of the southern margin of Eurasia prior to the India-Asia collision: First paleomagnetic constraints from Upper Cretaceous volcanic rocks near the western syntaxis of Tibet

Huang

Yang

et al. 2015

Tectonics

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We report the first combined geochronologic and paleomagnetic study of volcanic rocks from the Shiquanhe and Yare Basins at the westernmost Lhasa Terrane, which aims to provide an accurate constraint on the shape and paleoposition of the southern margin of Asia prior to the India-Asia collision. Three new 40 Ar/ 39 Ar ages of 92.5 ± 2.9 Ma, 92.4 ± 0.9 Ma, and 79.6 ± 0.7 Ma determined by fresh matrix or feldspar from lava flows suggest a Late Cretaceous age for the investigated units. Characteristic remanent magnetizations have been successfully isolated from 38 sites which pass positive fold and/or reversal, conglomerate tests and are hence interpreted as primary in origin. The two paleopoles obtained from Yare and Shiquanhe yield consistent paleolatitudes of 13.6°N ± 9.6°N and 14.2°N ± 2.7°N, respectively (for a reference site of 31.5°N, 80°E), indicating that the southern margin of Asia near the western syntaxis was located far south during the Late Cretaceous time. A reconstruction of the Lhasa Terrane in the frame of Eurasia with paleomagnetic data obtained from its western and eastern parts indicates that the southern margin of Eurasia probably had a quasi-linear orientation prior to the collision formerly trending approximately 315°E. This is compatible with the shape of the Neo-Tethys slab observed from seismic tomographic studies. Our findings provide a solid basis for evaluating Cenozoic crustal shortening in the Asian interior and the size of Greater India near the western syntaxis.

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A New Understanding on the Pattern of Deep Faults in Xizang and the Southwestern Sanjiang Area

Xiong

Ding

2015

Chinese J of Geophysics

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Extremely complicated fault structures characterize Xizang and the Sanjiang (Jinsha River, Lancang River, Nujiang River) region in southwest China. In spite of many years' study, different recognitions to this issue remain present. Based on new aeromagnetic data and gravity data, and from the view of combining gravity and magnetic characteristics with geological structure, we compile a new map of fault structures in Xizang and the southwestern Sanjiang region. The results show that the deep faults along the Jinsha River, Lancang River and Nujiang River are independent NW‐striking faults which extend from the south to the northwest, not connecting with the arc‐like faults in Xizang which extend from the east to the west. These faults are newly discovered NW‐striking faults in the Tethys fault system and belong to a different fault system relative to EW‐striking faults in Xizang. This opinion is different from the previous view that the suture zones of Jinsha River, Lungmu Co‐Lancang River and Bangong Co‐Nujiang River extend towards NW and EW in arc distribution. This discovery of the faults has changed the recognition of fault structure framework of Xizang‐Sanjiang areas, which lends light on the geotectonic research in the future. In this paper, the west extending characteristics of deep fault belt developed in Xizang and southwest Sanjiang River area are mainly explained, and the intersection relationship of faults between the Sanjiang River and Xizang is also discussed, which indicates that gravity and magnetic data are significant for the research on fault structures.

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Converted‐Wave Static Correction Method for Thick Weathering Area

Cited by 20 publications

References 16 publications

Estimation of S-wave static corrections using CMP cross-correlation of surface waves

Estimation of S-wave static corrections using CMP cross-correlation of surface waves

A quasi-linear structure of the southern margin of Eurasia prior to the India-Asia collision: First paleomagnetic constraints from Upper Cretaceous volcanic rocks near the western syntaxis of Tibet

A New Understanding on the Pattern of Deep Faults in Xizang and the Southwestern Sanjiang Area

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