Anne Sheehan

afs@terra.colorado.edu

+1 303 492-4597

Coop Inst Res/Envrm Sci - Dir, University of Colorado at Boulder, 216 UCB, Boulder, CO 80309-0216, U.S.A.

https://cires.colorado.edu/research/research-groups/project/collaborative-research-seismotectonics-and-structure-creeping

Datasets from temporary deployments # First Dataset, Reference 1: de la Torre, T.L., Monsalve, G., Sheehan, A.F., Sapkota, S., Wu, F., 2007. Earthquake processes of the Himalayan collision zone in eastern Nepal and the southern Tibetan Plateau, Geophys. J. Int., 2007, 171, doi: 10.1111/j.1365-246X.2007.03537.x

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The main studies and their purposes are: (1) teleseismic P and S arrival times and waveforms will be used to decipher the general crustal and upper mantle structures under the Himalaya: to determine the presence of subduction zone and other structures under the Himalaya, (2) the arrival times of hundreds of earthquakes under the orogen will be used to image the 3-D crustal structures underneath the Himalaya and relocate earthquakes: to determine the internal structure and rheology of the orogen, (3) SKS anisotropy under the Himalaya: to map upper mantle flow, (4) focal mechanisms from regional moment tensor inversion: to determine kinematics of orogenic deformation. For testing the current hypotheses we shall determine whether fault ramps, where seismic events with characteristic focal mechanism should concentrate, exist and whether the decollement can be detected through seismicity or material differences. Using SKS and teleseismic data we expect also to map features in the upper mantle underneath the orogen, such as the subducted Indian lithosphere and products of delamination. The geometry of the source zone, the nature of the seismic slip and kinematics derived from this experiment will also help constrain the interpretation of ongoing expanded geodetic surveying in the area. We aim at a better model for Himalayan tectonics in particular and mountain building in general.

List of data files