HR: 0800h
AN: T41F-1281    [Abstracts]
TI: Relationship between surface ruptures and subjacent source faults
AU: * KITADA, N
EM: kitada@geor.or.jp
AF: Geo-research Institute, 4-3-2 Itachibori, Nishi-ku, Osaka, 550-0012 Japan
AU: INOUE, N
EM: naoto@aso.vgs.kyoto-u.ac.jp
AF: Aso Volcanological Laboratory, Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Choyo, Aso,, Kumamoto, 869-1404 Japan
AU: TAKEMURA, K
EM: takemura@bep.vgs.kyoto-u.ac.jp
AF: Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Noguchibaru, Beppu, Bappu, 874-0903 Japan
AU: KAGAWA, T
EM: kagawa@geor.or.jp
AF: Geo-research Institute, 4-3-2 Itachibori, Nishi-ku, Osaka, 550-0012 Japan
AU: OKADA, A
EM: okada@kugi.kyoto-u.ac.jp
AF: Department of Geophysics, Graduate School of Science, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto, 606-8502 Japan
AU: TSUTSUMI, H
EM: tsutsumh@kugi.kyoto-u.ac.jp
AF: Department of Geophysics, Graduate School of Science, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto, 606-8502 Japan
AB: Concepts of setting source fault parameters from surface rupture due to active faults are discussed for predictions of strong ground motion. Estimation of ground motion plays important rule for the prevention of earthquake hazards. From recent developments in waveform inversion analysis of fault rupture processes through large earthquakes, it is found that strong ground motion is strongly affected by fault geometry and slip heterogeneity. At the prediction of strong ground motions for scenario earthquakes by active faults, the initial parameters of source faults, such as fault length, direction and dip are thus necessary to be determined. Among the parameters used for strong ground motion simulation, fault length and dip are derived from information related to surface fault ruptures. Because these parameters take significant effect on the simulation, much care is required for geological investigation to construct source fault model. On the other hand, the development of study on surface faulting (rupture), recurrent interval and probability of occurrence are estimated from assessment of surface rupture. Surface fault morphology provides fault length, its segmentation, displacement, direction and dip. However, relationship between the parameters of the surface rapture and those of the subjacent source fault is still a problem. We first studied correlation between surface faults and subjacent source faults, such as basic geological estimation of the source fault derived from surface fault ruptures. We collected information of surface ruptures (length, dip, displacement and morphology) and results of waveform inversions (source fault length, dip and distribution of asperities) in twelve large earthquakes. They are being carefully investigated from the view point of geology and seismology. The relation among the intended parameters shall be presented in our poster.
DE: 7223 Seismic hazard assessment and prediction
DE: 8010 Fractures and faults
DE: 5475 Tectonics (8149)
DE: 7212 Earthquake ground motions and engineering
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting