HR: 16:45h
AN: U54A-04    [Abstracts]
TI: FIELD SURVEY AND PRELIMINARY MODELING OF THE NEAR-FIELD TSUNAMI FROM THE BENGKULU EARTHQUAKE OF 12 SEPTEMBER 2007
AU: Borrero, J C
EM: jborrero@usc.edu
AF: Dept. Civil Engin., Univ. Southern Calif., Los Angeles, CA 90089, United States
AU: Borrero, J C
EM: jborrero@usc.edu
AF: ASR Marine, Consulting & Res., Raglan, 2051, New Zealand
AU: Hidayat, R
AF: BPPT, Jl. M.H. Thamrin, 8, 10340, Jakarta, Indonesia
AU: Suranto, .
AF: BPPT, Jl. M.H. Thamrin, 8, 10340, Jakarta, Indonesia
AU: Bosserelle, C
AF: ASR Marine, Consulting & Res., Raglan, 2051, New Zealand
AU: * Okal, E A
EM: emile@earth.northwestern.edu
AF: Northwestern, Univ., Evanston, IL 60208, United States
AB: In the aftermath of the Bengkulu earthquake of 12 September 2007, an International Post-Tsunami Survey Team visited the near field area, along a 280-km stretch of the coast, from Ipuh in the North to Bituhan in the South. Run-up values were measured at 19 locations, averaging 2 meters, with a maximum of 4 meters and inundation reaching 500 m near Lais (3.5 deg.sS; 102 deg.E). We use a number of preliminary source models featuring various distributions of slip along the fault plane as sources in a near simulation using the MOST code. The database of surveyed points is well modeled by a uniform slip on the fault plane, and more sophisticated source models fail to substantially improve the fit. Far field modeling of the tsunami confirmed its negligible character, resulting from a contained seismic moment (5E28 dyn*cm) and the presence of shallow bathymetry (featuring a ridge at only 200 m depth) in the epicentral area.
DE: 4564 Tsunamis and storm surges
SC: Union [U]
MN: 2007 Fall Meeting