HR: 0800h
AN: V21B-0598    [Abstracts]
TI: Volcano Collapse in the Bismarck Volcanic Arc, Papua New Guinea
AU: * Silver, E
EM: esilver@pmc.ucsc.edu
AF: University of California, Earth Sciences Department 1156 High Street, Santa Cruz, CA 95064 United States
AU: Day, S
EM: sday@pmc.ucsc.edu
AF: University of California, Earth Sciences Department 1156 High Street, Santa Cruz, CA 95064 United States
AU: Ward, S
EM: sward@pmc.ucsc.edu
AF: University of California, Earth Sciences Department 1156 High Street, Santa Cruz, CA 95064 United States
AU: Hoffmann, G
EM: garyh@pmc.ucsc.edu
AF: University of California, Earth Sciences Department 1156 High Street, Santa Cruz, CA 95064 United States
AU: Driscoll, N
EM: ndriscoll@ucsd.edu
AF: Scripps Institution of Oceanography, Geosciences Research Division, La Jolla, CA 92093 United States
AU: Applegate, B
EM: bruce@soest.hawaii.edu
AF: University of Hawaii, HMRG, Honolulu, HI 96822 United States
AU: Llanes-Estrada, P
EM: pllanes@geo.ucm.es
AF: University of California, Earth Sciences Department 1156 High Street, Santa Cruz, CA 95064 United States
AU: Lyons, A
EM: infinitytree@hotmail.com
AF: University of California, Earth Sciences Department 1156 High Street, Santa Cruz, CA 95064 United States
AB: During November and December, 2004, we imaged much of the Bismarck volcanic arc with EM120 swath bathymetry and Hawaii MR1 side-scan aboard the R/V Kilo Moana. Local regions were imaged with the SIO Edgetech chirp system and the WHOI TowCam. In addition, we collected 13 cores and one dredge haul. During this study we identified approximately 12 debris avalanche deposits, including great detail of the 1888 Ritter collapse, discussed separately. Highlights of the other collapse fields includes a large deposit associated with the breach of the caldera on Garove island, debris fields north of Dakataua volcano, both north and south of Karkar volcano, south of Manam volcano, north and south of Crown island, north of Long Island, north of both Tolokiwa and Sakar islands, and south of Bam volcano. Some or many of these debris fields could represent multiple collapses, and many probably generated tsunamis. We expect that all island chains have suffered significant collapses of many of their volcanoes during their histories.
DE: 8185 Volcanic arcs
DE: 8400 VOLCANOLOGY
DE: 8404 Volcanoclastic deposits
DE: 8488 Volcanic hazards and risks
SC: Volcanology, Geochemistry, Petrology [V]
MN: Fall Meeting 2005