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Conference Paper

P-wave tomographic structure of NE Tibet

Authors

Nunn,  C.
External Organizations;

/persons/resource/tilmann

Tilmann,  Frederik
2.4 Seismology, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Priestley,  K.
External Organizations;

Roecker,  S.
External Organizations;

Heybrn,  R.
External Organizations;

INDEPTH IV, 
Deutsches GeoForschungsZentrum;

ASCENT Team, 
Deutsches GeoForschungsZentrum;

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Citation

Nunn, C., Tilmann, F., Priestley, K., Roecker, S., Heybrn, R., INDEPTH IV, ASCENT Team (2011): P-wave tomographic structure of NE Tibet, (Geophysical Research Abstracts Vol. 13, EGU2011-8040, 2011), General Assembly European Geosciences Union (Vienna, Austria 2011).


https://gfzpublic.gfz-potsdam.de/pubman/item/item_247053
Abstract
We invert a data set of more than 26,000 teleseismic P-wave arrival times to determine the variation in compressional wave structure beneath NE Tibet. The seismograms from which the arrival times were read were recorded from 572 events at 80 stations from the ASCENT and INDEPTH IV experiments from 2007-2009. The motivation for the experiments was to extend earlier seismic surveys to the edge of the plateau, and consider an area which contains the Kunlun Fault, and the Jinsha and Bangong-Nujiang sutures. The experiments are intended to resolve issues such as how deep the fault zones extend, the variation in Moho depth across the region, and consider the viability of the crustal flow hypothesis. The resulting tomographic models show a number of large scale features. There is a slow anomaly extending to 400km depth across the Kunlun Qaidam and Songpan Ganzi terranes, from approximately 91 _E to 95 _E. There is an extensive fast region across the Qiantang from 31 _N to 34 _N and 90 _E to 94 _E, which also appears to persist to 400km depth. There is a deep, fast anomaly across the Qaidam Basin, with a sharp transition to slower material to the south. The resolution tests suggest that resolution of features tens of kilometres wide is possible, but with significant smearing (particularly in the vertical direction).