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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Himalayas (2)
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Indian Peninsula
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Bhutan (1)
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India
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Shillong Plateau (1)
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Nepal (1)
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Main Central Thrust (1)
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Europe
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Western Europe
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Scandinavia
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Norway (1)
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geologic age
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Cenozoic
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Quaternary
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Holocene (1)
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Siwalik System (1)
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metamorphic rocks
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metamorphic rocks
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granulites (1)
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Primary terms
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Asia
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Himalayas (2)
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Indian Peninsula
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Bhutan (1)
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India
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Shillong Plateau (1)
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Nepal (1)
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Main Central Thrust (1)
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Cenozoic
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Quaternary
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Holocene (1)
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Siwalik System (1)
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crust (1)
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deformation (2)
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earthquakes (3)
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Europe
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Western Europe
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Scandinavia
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Norway (1)
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faults (2)
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geomorphology (1)
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metamorphic rocks
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granulites (1)
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plate tectonics (1)
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tectonics
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neotectonics (1)
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Sustained deformation across the Sub-Himalayas since 200 ka
Precise Locating of the Great 1897 Shillong Plateau Earthquake Using Teleseismic and Regional Seismic Phase Data
Sustainable densification of the deep crust
Active tectonics of the eastern Himalaya: New constraints from the first tectonic geomorphology study in southern Bhutan
Discontinuous low-velocity zones in southern Tibet question the viability of the channel flow model
Abstract Low-velocity zones (‘bright spots’) imaged by the INDEPTH seismic experiment in southern Tibet are extensively interpreted as widespread partial melt within the crust, which has given a strong support for the channel flow model. These suggest that a continuous seismic low-velocity zone underlies Tibet on the large scale. Here we take advantage of the Hi-CLIMB seismic experiment which includes a dense south–north profile and a lateral 2D seismic network to assess the vertical and the horizontal extension of low-velocity zones in southern Tibet. Several approaches including migration, amplitude analysis and waveform inversion of receiver functions are performed to detect crustal low-velocity zones using this new seismological dataset. Our results reveal localized and discontinuous low-velocity zones in Tibet. They indicate that the vertical extension of the low-velocity zones is about 10 km, and their maximum horizontal length appears to be c . 50 km. Our study suggests a partial correlation between the location of these low-velocity zones and the spatial distribution of Tibetan grabens. These results, especially the non-continuity of low-velocity zones, together with the observed regular value of mean crustal V P /V S ratio, question the existence of widespread partial melt of the southern Tibetan crust and, therefore, the viability of the channel flow model.