HR: 16:30h
AN: V34A-05    [Abstracts]
TI: The CALIPSO Borehole Project at SoufriŠre Hills Volcano, Montserrat, BWI: Status and Scientific Overview of Prodigious Dome Collapse of July 2003
AU: * Mattioli, G S
EM: mattioli@uark.edu
AF: University of Arkansas, 113 Ozark Hall, Fayetteville, AR 72701 United States
AU: Voight, B
AF: Penn State University, 334 Deike Bldg, University Park, AR 16802 United States
AU: Linde, A T
AF: Carnegie Institution of Washington, 5241 Broad Branch Road, Washington, USA 20015 United States
AU: Sacks, I S
AF: Carnegie Institution of Washington, 5241 Broad Branch Road, Washington, USA 20015 United States
AU: Watts, P
AF: Applied Fluids Engineering, 5710 E. 7th Street, Long Beach, CA 90803 United States
AU: Hidayat, D
AF: Penn State University, 334 Deike Bldg, University Park, AR 16802 United States
AU: Young, S R
AF: Penn State University, 334 Deike Bldg, University Park, AR 16802 United States
AU: Widiwijayanti, C
AF: Penn State University, 334 Deike Bldg, University Park, AR 16802 United States
AU: Shalev, E
AF: Duke University, Box 90235, Durham, NC 27708 United States
AU: Malin, P E
AF: Duke University, Box 90235, Durham, NC 27708 United States
AU: Elsworth, D
AF: Penn State University, 334 Deike Bldg, University Park, AR 16802 United States
AU: Williams, P
AF: Montserrat Volcano Observatory, Fleming, Salem, 664 Montserrat
AU: Van Boskirk, E
AF: University of Arkansas, 113 Ozark Hall, Fayetteville, AR 72701 United States
AU: Thompson, G
AF: Montserrat Volcano Observatory, Fleming, Salem, 664 Montserrat
AU: Syers, T
AF: Montserrat Volcano Observatory, Fleming, Salem, 664 Montserrat
AU: Sparks, R S
AF: Bristol University, Queens Rd., Bristol, BS8 1RJ United Kingdom
AU: Schleigh, B
AF: Carnegie Institution of Washington, 5241 Broad Branch Road, Washington, USA 20015 United States
AU: Norton, G
AF: Montserrat Volcano Observatory, Fleming, Salem, 664 Montserrat
AU: Neuberg, J
AF: Leeds University, School of Earth Sciences, Leeds, LS2 9JT United Kingdom
AU: Miller, V
AF: Penn State University, 334 Deike Bldg, University Park, AR 16802 United States
AU: McWhorter, N
AF: Carnegie Institution of Washington, 5241 Broad Branch Road, Washington, USA 20015 United States
AU: Johnston, W
AF: University of Arkansas, 113 Ozark Hall, Fayetteville, AR 72701 United States
AU: Dunkley, P
AF: Montserrat Volcano Observatory, Fleming, Salem, 664 Montserrat
AU: Clarke, A B
AF: Arizona State University, Box 871404, Tempe, AZ 85827 United States
AU: Bass, V
AF: Montserrat Volcano Observatory, Fleming, Salem, 664 Montserrat
AB: The CALIPSO Project (Caribbean Andesite Lava Island-volcano Precision Seismo-geodetic Observatory) has greatly enhanced the monitoring and scientific infrastructure at the SoufriŠre Hills Volcano, Montserrat with the recent installation of an integrated array of borehole and surface geophysical instrumentation at four sites (Mattioli et al., 2004). The sensor package at each site includes: a single-component, very broad band, Sacks-Evertson strainmeter, a three-component seismometer (~Hz to 1 kHz), a Pinnacle Technologies series 5000 tiltmeter, and a surface Ashtech u-Z CGPS station with choke ring antenna, SCIGN mount and radome. The project has been successfully launched with its capture of the tremendous SHV lava dome collapse of 12-13 July 2003 (Herd et al., 2003), involving about 120 million cubic meters--the largest lava dome collapse in the historical record. A wide variety of unique geophysical signals were acquired CALIPSO instrumentation during the July 2003 collapse and important constraints on a variety of volcanic processes are being obtained. For example, tsunami waves were generated 2 km east of the volcanic dome by pyroclastic flows entering the sea. We reconstruct collapse volume-time history from seismic signals generated by pyroclastic flows, using the method of Brodscholl et al. (2000). The tsunami left flotsam strandlines of runup >8m high along the east coast of Montserrat, and waves ~0.5m high were reported from Guadaloupe. Unique borehole dilatometer data (Voight et al., 2003; Mattioli et al., 2003; 2004) record details of tsunami wave passage. One station is located 40m from the sea, with the instrument ~180m below MSL. Strain wave packets at periods of ~200-500s occurred, consistent in period and amplitude with water loading from passing tsunami waves. Wave packets between ~0600-1130 LT can be correlated with pyroclastic flow seismic data. Non-linear Boussinesq hydrodynamic modeling fits wave decay from source to instrument site and is consistent with wave periods and delay times. Coherent near-field waves depend on flow volume, submerged time of motion, and bathymetry. The model matches the delay time between pyroclastic flow entry time and arrival of tsunami waves at the instrument site.
DE: 1294 Instruments and techniques
DE: 3094 Instruments and techniques
DE: 4564 Tsunamis and storm surges
DE: 7280 Volcano seismology (8419)
DE: 8419 Eruption monitoring (7280)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2005 Joint Assembly