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Título: | Complex images of Moho and variation of Vp/Vs across the Himalaya and South Tibet, from a joint receiver-function and wide-angle-reflection approach |
Autor: | Galvé, A.; Sapin, M.; Hirn, A.; Diaz, J. CSIC ORCID ; Lépine, Jean-Claude; Laigle, M.; Gallart Muset, Josep CSIC ORCID; Jiang, M. | Fecha de publicación: | 2002 | Editor: | American Geophysical Union | Citación: | Geophysical Research Letters 29: 35- 1 (2002) | Resumen: | Teleseismic receiver functions (RF) allow us to image the spatial variation of the crust-mantle boundary (Moho) along a tight array spanning from south of the Himalayas to the centre of the Tibetan Plateau. This approach is cross-tested with wide-angle reflection imaging (WARR). Highlighted by each of the two independent methods, a complex architecture of the Moho with dipping and overlapping segments indicating lithospheric imbrication, is confirmed. The joint use of the two methods reveals an increase of the average crustal P-to-S-wave-velocity ratio from south to the centre of the Lhasa block. This may be due to lowered S-wave velocity confined in specific layers, that may be interpreted as partial melt. This accounts for half of the relative increase in the delay of direct teleseismic S-wave arrivals with respect to P-wave arrivals from south to north, suggesting a similar anomaly in the shallower mantle. | URI: | http://hdl.handle.net/10261/67529 | DOI: | 10.1029/2002GL015611 | ISSN: | 0094-8276 |
Aparece en las colecciones: | (Geo3Bcn) Artículos |
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