HR: 0800h
AN: NS11A-0153 [Abstracts]
TI: Exploring the Possibilities of Passive Seismic Interferometry to Image Temperate Glaciers
AU: * Mikesell, T D
EM: dmikesell@cgiss.boisestate.edu
AF: Boise State University, 1910 University Drive, Boise, ID 83725, United States
AU: Bradford, J H
EM: johnb@cgiss.boisestate.edu
AF: Boise State University, 1910 University Drive, Boise, ID 83725, United States
AU: van Wijk, K
EM: kasper@cgiss.boisestate.edu
AF: Boise State University, 1910 University Drive, Boise, ID 83725, United States
AU: Raza, T
EM: TabishRaza@mail.boisestate.edu
AF: Boise State University, 1910 University Drive, Boise, ID 83725, United States
AB:
To aid the general scope of a larger project studying hydrological processes occurring within and beneath
glaciers, we installed a small passive seismic network on the Bench glacier, near Valdez, AK. In conjunction with
active-source seismic and GPR surveys, passive data is recorded over a period of 10 days along two separate
receiver arrays. Four receivers are placed on a line parallel to the glacier's movement, while six receivers form a
line perpendicular to the first, traversing the glacier.
Seismic interferometry is used to extract Green functions between receiver pairs. In this work we explore the use
of rock falls from the surrounding mountains, water traveling within the glacier and at the glacier bed, and
fracturing of the glacier ice as possible seismic sources to image the englacial and subglacial systems. Aided by
the low intrinsic seismic energy loss of ice and a favorable distribution of natural sources, it may be possible to
use passive seismic imaging to help us understand key glacial processes such as fracture formation and water
movement from the surface to the bed of the glacier.
UR: http://pal.boisestate.edu/mediawiki/index.php?title=Bench07_interferometry&action=edit
DE: 0720 Glaciers
DE: 0738 Ice (1863)
DE: 0794 Instruments and techniques
DE: 7230 Seismicity and tectonics (1207, 1217, 1240, 1242)
DE: 7294 Seismic instruments and networks (0935, 3025)
SC: Near-Surface Geophysics [NS]
MN: 2007 Fall Meeting