HR: 1330h
AN: S32B-0849    [PDF]
TI: Site Effect for KNET Stations in Middle Asia: the Directional Dependence of {\it P}-Wave Energy From Results on Magnitude {\it mb} Residual
AU: * Martynov, V G
EM: vladik@epicenter.ucsd.edu
AF: IGPP/SIO/UCSD, 0225, La Jolla, CA 92093 United States
AU: Vernon, F L
EM: vernon@epicenter.ucsd.edu
AF: IGPP/SIO/UCSD, 0225, La Jolla, CA 92093 United States
AU: Kilb, D
EM: dkilb@epicenter.ucsd.edu
AF: IGPP/SIO/UCSD, 0225, La Jolla, CA 92093 United States
AU: Tytell, J
EM: jtytell@epicenter.ucsd.edu
AF: IGPP/SIO/UCSD, 0225, La Jolla, CA 92093 United States
AB: We present results on site effects for the determination of magnitude {\it mb}. We collected data from teleseismic events ($30\deg$$<$ $\Delta$ $<$$80\deg$) recorded by the Kyrgyz Digital Seismic Network (KNET) in northern Tien Shan from 1991 to 1998. Our results show {\it mb} residual with respect to reference data from PDE catalog has significant directional variation, from -0.1 to -0.8 unit of {\it mb} scale. We discuss the alternative sources of directional dependence of {\it P}-wave energy in terms of seismic attenuation and local bedrock topography structure beneath KNET.
DE: 7205 Continental crust (1242)
DE: 7215 Earthquake parameters
SC: Seismology [S]
MN: 2003 Fall Meeting