HR: 0800h
AN: G51A-0053    [Abstracts]
TI: Results of Seafloor Vertical Deformation Monitoring on the Submerged South Flank of Kilauea Volcano, Hawaii from 2000 - 2004
AU: * Phillips, K A
EM: katiep@ucsd.edu
AF: Scripps Institution of Oceanography, UCSD 9500 Gilman Drive Mail code 0205, La Jolla, CA 92093-0205 United States
AU: Chadwell, C D
EM: cchadwell@ucsd.edu
AF: Scripps Institution of Oceanography, UCSD 9500 Gilman Drive Mail code 0205, La Jolla, CA 92093-0205 United States
AB: Kilauea Volcano is one of the most active volcanoes on Earth. The south flank of Kilauea undergoes large-scale deformation as a result of volcanic and tectonic processes that has been well-monitored onshore. Since the majority of the volcano is submerged, however, undersea monitoring of crustal deformation is necessary to constrain kinematic models of Kilauea. Models based on the onshore geodetic data have suggested offshore motion, but this cannot be measured with land-based approaches. By combining an acoustic technique with kinematic GPS survey methods and a seafloor survey using pressure sensors, it is possible to measure the horizontal and vertical motion of the south flank on the seafloor. In November of 2000, an array of seven precision acoustic transponders and six seafloor benchmarks was installed and measured offshore on the south flank of Kilauea. Repeat measurements were made in April of 2002 and again in August of 2004. We will present results from reductions of the pressure sensor data from 2000 - 2004 that describe the vertical motion on the seafloor during this time period. We will also present a new model of south flank deformation on Kilauea based on our seafloor geodetic results as well as the available onshore geodetic data, thus providing a better understanding of the structure and dynamics of the volcano as a whole.
DE: 8494 Instruments and techniques
DE: 1200 GEODESY AND GRAVITY
DE: 1208 Crustal movements--intraplate (8110)
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting