HR: 0800h
AN: T11D-1284    [Abstracts]
TI: Probabilistic Seismic Hazard Assessment in Mongolia. Amplification Frequency Microzoning at Ulaanbaatar
AU: * SCHLUPP, A
EM: antoine.schlupp@cea.fr
AF: CEA/DIF/DASE laboratoire risque sismique et geologique, BP12, Bruyeres le Chatel, 91680 France
AU: DUGARMAA, T
EM: dugarmaa@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: ULZIIBAT, M
EM: ulzibat@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: MARIN, S
EM: sylvie.marin@cea.fr
AF: CEA/DIF/DASE laboratoire risque sismique et geologique, BP12, Bruyeres le Chatel, 91680 France
AU: Ankhtsetseg, D
EM: d_ankhaa@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Bayarsaikhan, C
EM: bayarsaikhan@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Adiya, M
EM: adija@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Baasanbat, T
EM: bsb@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Bayar, G
EM: bayart@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Erdenezul, D
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Mungunsuren, D
EM: mongon@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Munkhsaikhan, A
EM: mogii@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Munkhuu, D
EM: mounho@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Narantsetseg, R
EM: naraa@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Odonbaatar, C
EM: odon@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Selenge, L
EM: selenge@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Tsembel, B
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Urtnasan, K
EM: urtaa@rcag.url.mn
AF: Research Centre of Astronomy & Geophysics of the Mongolian Academy of Sciences (RCAG), PO Box 152, Ulaanbaatar, 51 Mongolia
AU: Nicolas, M
EM: marc.nicolas@cea.fr
AF: CEA/DIF/DASE laboratoire risque sismique et geologique, BP12, Bruyeres le Chatel, 91680 France
AU: Guilbert, J
AF: CEA/DIF/DASE laboratoire risque sismique et geologique, BP12, Bruyeres le Chatel, 91680 France
AU: Thauvin, E
EM: eric.thauvin@cea.fr
AF: CEA/DIF/DASE laboratoire risque sismique et geologique, BP12, Bruyeres le Chatel, 91680 France
AB: The last ten years, many studies about active deformation have been done in Mongolia. The description of the active fault have been improved and the recurrence time of large earthquakes where estimated by pale seismological investigations. A specific paleoseismological study on a thrust fault associated with cumulative surface ruptures has been done showing that large event with magnitude up to 7 take place in this central Asia region where most of large faults are strike slip faults. The seismic recordings have been completely reviewed and the installation of new seismic sensor allows us to better describe the present activity and the attenuation laws. From these recent knowledge, we propose a new seismotectonic model based on known active faults including thrust faults (associated to seismicity or paleoseismicity or to active morphology) and on a homogeneous seismic catalog. The probabilistic analysis, where we included an amplification factor on quaternary sediments, shows a new view of the level of hazard which is not only the mirror of the observed activity but the potential pick ground acceleration for various period of time. The association of geological and seismological characteristics of the region largely improves the results where we show the contribution, for various period of time, of the ® background ¯ seismic activity, the fault activity and the amplification due to soft sediments. We applied also the model for the capital, Ulaanbaatar where live half of the population and stay most of the economy. Using extensive site effect measurements, we estimated the amplified frequencies in the capital. These new results, despite some parameters can still be improved, gives now to the Mongols authorities an estimation of the hazard based on most recent knowledge in this area.
DE: 7223 Seismic hazard assessment and prediction
DE: 7230 Seismicity and seismotectonics
DE: 8102 Continental contractional orogenic belts
DE: 8107 Continental neotectonics
DE: 7215 Earthquake parameters
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting