HR: 1330h
AN: V32B-1018    [PDF]
TI: Numerical Modeling of Sound from the Eruption of Anatahan Volcano, Mariana Islands
AU: * Park, M
EM: minkyu@kordi.re.kr
AF: Korea Ocean Research and Development Institute (KORDI), P.O. Box 29, Ansan, 425-600 Korea, Republic of
AU: Dziak, R P
AF: Oregon State University/NOAA, Hatfield Marine Science Center, 2030 SE Marine Scinece Dr., Newport, OR 97365 United States
AU: Byun, S
AF: Korea Ocean Research and Development Institute (KORDI), P.O. Box 29, Ansan, 425-600 Korea, Republic of
AU: Fox, C G
AF: National Oceanic and Atmospheric Administration/ Pacific Marine Environment Laboratory, 2030 SE Marine Scinece Dr., Newport, OR 97365 United States
AU: Matsumoto, H
AF: Oregon State University/NOAA, Hatfield Marine Science Center, 2030 SE Marine Scinece Dr., Newport, OR 97365 United States
AB: NOAA VENTS Program deployed an array of five autonomous underwater hydrophones within the SOFAR channel along the Mariana chain in February 2003 to monitor seafloor volcanic eruptions and submarine earthquakes (sponsored by NOAA's Ocean Exploration Program). These five hydrophones will be recovered in September 2003 using KORDI {\it R/V Onnuri}. The first historical eruption of Anatahan volcano in the Mariana Islands began on 10 May 2003. It is expected that the hydrophone data will include the hydroacoustic records of the eruption of Anatahan Volcano. The signals recorded from the eruption will be numerically modeled using a T-wave excitation mechanism developed from the mode scattering theory of Park {\it et al.} (2001). They found that scattering from the rough seabottom converts the acoustic energy of seafloor earthquakes from the directly excited ocean crustal/water column modes to the propagating acoustic modes of T-waves, and developed an algorithm to numerically model oceanic earthquake's T-waves. We modified this numerical model of Park {\it et al.} (2001) to predict the T-waves generated from volcanic sources by adopting a buried magmatic pipe model (Chouet, 1985). We derived a moment-tensor representation of a volcano-seismic source that is governed by the geometry of the source and the physical properties of magma. Numerical modeling of the sound from the eruption requires us to determine governing factors such as the pipe radius and magma viscosity that will enable us to grasp the inward nature of Anatahan volcano.
DE: 3025 Marine seismics (0935)
DE: 4259 Ocean acoustics
DE: 7260 Theory and modeling
DE: 7280 Volcano seismology (8419)
DE: 8419 Eruption monitoring (7280)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting