HR: 09:15h
AN: V51H-06 INVITED    [Abstracts]
TI: Crater Floor and Lava Lake Dynamics Measured with T-LIDAR at Pu`u`O`o Crater, Hawai`i
AU: * Brooks, B A
EM: bbrooks@soest.hawaii.edu
AF: School of Ocean and Earth Science and Technology, University of Hawaii, 1680 East-West Rd., Honolulu, HI 96822, United States
AU: Kauahikaua, J P
EM: jimk@usgs.gov
AF: USGS Hawaii Volcano Observatory, PO Box 51, Hawaii National Park, HI 96718, United States
AU: Foster, J H
EM: jfoster@soest.hawaii.edu
AF: School of Ocean and Earth Science and Technology, University of Hawaii, 1680 East-West Rd., Honolulu, HI 96822, United States
AU: Poland, M P
EM: mpoland@usgs.gov
AF: USGS Hawaii Volcano Observatory, PO Box 51, Hawaii National Park, HI 96718, United States
AB: We used a near-infrared (1.2 micron wavelength) tripod-based scanning LiDAR system (T-LIDAR) to capture crater floor and lava lake dynamics in unprecedented detail at P`u`u `O`o crater on Kilauea volcano, Hawai`i. In the ~40 days following the June 17-19 intrusion/eruption, Pu`u `O`o crater experienced substantial deformation comprising 2 collapse events bracketing rapid filling of the crater by a lava lake. We surveyed the crater floor with centimeter-scale spot-spacings from 3 different vantage points on July 13 and from one vantage point on July 24. Data return was excellent despite heavy fume on July 24 that obscured nearly all of the crater features, including the walls and floor. We formed displacement fields by aligning identical features from different acquisition times in zones on the relatively stable crater walls. From July 13, over a period of several hours, we imaged ~2 m of differential lava lake surface topography from the upwelling (eastern) to downstream (western) portion of the flowing lava lake. From July 13 to July 24, the lava lake level dropped by as much as 20 meters in a zone confined by flanking levees. Our results confirm the utility of T-LiDAR as a new tool for detailed volcano geodesy studies and suggest potential applications in volcano hazards monitoring.
DE: 1204 Control surveys
DE: 1294 Instruments and techniques
DE: 8419 Volcano monitoring (7280)
DE: 8485 Remote sensing of volcanoes
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting