Group velocity tomography of the Indo-Eurasian collision zone
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TLDR
In this article, the authors present results of a Rayleigh and Love wave group velocity dispersion study of the Indo-Eurasian collision zone, where the authors measured the dispersion curves and combined them to produce dispersion maps for 10-70 s period Rayleigh waves from 4054 paths and for 15-70s s Love waves from 1946 paths.Abstract:
We present results of a Rayleigh and Love wave group velocity dispersion study of the Indo-Eurasian collision zone. Group velocity dispersion curves are measured and combined to produce dispersion maps for 10–70 s period Rayleigh waves from 4054 paths and for 15–70 s Love waves from 1946 paths. Group velocity maps benefit from the inclusion of data recorded at a large number of stations within India, an advantage over previous global studies. This has the largest impact at short periods as a result of the improved path length distribution. Synthetic tests are used to estimate resolution, which ranges from 3° to 5° on the continents for Rayleigh wave maps and from 5° to 7.5° for Love wave maps. Group velocities correspond well with known geological and tectonic features and show good correlation with sediment thickness at short periods. The cratons of the Indian Shield can be distinguished in the short-period and midperiod group velocities. Group velocities are slow across Tibet until 70 s whereas the cratonic cores of the Indian Shield appear as a high velocity anomaly at 70 s. Dispersion curves extracted from the Rayleigh wave group velocity maps are inverted for shear wave velocity as a function of depth for profiles across India and Tibet. The relationship between shear velocity contours and the Moho indicated by receiver function studies has been used to obtain a first-order estimate of crustal thickness across the collision zone. Results suggest a slow Tibetan midcrust and low sub-Moho velocities beneath the central and northeastern Tibetan Plateau.read more
Citations
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References
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Journal ArticleDOI
Constraints on seismic velocities in the Earth from traveltimes
TL;DR: In this article, a new empirical traveltime curves for the major seismic phases have been derived from the catalogues of the International Seismological Centre by relocating events by using P readings, depth phases and the iasp91 traveltimes, and then re-associating phase picks.
Journal ArticleDOI
New version of the generic mapping tools
Paul Wessel,Walter H. F. Smith +1 more
TL;DR: GMT is a public domain collection of UNIX tools that contains programs to manipulate (x,y,z) data and to generate PostScript illustrations, including simple x-y diagrams, contour maps, color images, and artificially illuminated, perspective, shaded-relief plots using a variety of map projections.
Journal ArticleDOI
Global teleseismic earthquake relocation with improved travel times and procedures for depth determination
TL;DR: In this article, a global probability model was developed for later-arriving phases to independently identify the depth phases, and the relocations were compared to hypocenters reported in the ISC and NEIC catalogs and by other sources.
Journal ArticleDOI
Tibetan tectonic evolution inferred from spatial and temporal variations in post-collisional magmatism
Sun-Lin Chung,Mei Fei Chu,Yuquan Zhang,Yingwen Xie,Ching-Hua Lo,Tung Yi Lee,Ching Ying Lan,Xian-Hua Li,Qi Zhang,Yizhao Wang +9 more
TL;DR: In this article, a geodynamic evolution model was proposed to depict when and how the Indian continental lithospheric mantle started thrusting under Asia by involving rollback and breakoff of the subducted Neo-Tethyan slab followed by removal of the thickened Lhasa root.
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