HR: 15:45h
AN: U44A-02    [Abstracts]
TI: T waves from the 2004 Sumatra earthquake and its aftershocks
AU: * OKAL, E A
EM: emile@earth.nwu.edu
AF: Northwestern, Univ., Evanston, IL 60208 United States
AB: At the time of writing (early February 2005), more than 75 CMT solutions are already available for aftershocks of the great 2004 Sumatra earthquake. The mainshock and most of the aftershocks generated hydroacoustic (T) waves in the Indian Ocean, recorded in particular at the IRIS station at Diego Garcia. We have started to analyze systematically their records, and to compile a database of the parameters GAMMA introduced by Okal et al. [2003, scaling the T-phase energy flux to the seismic moment. Similarly, we compute the duration-amplitude discriminant D introduced by Talandier and Okal [2001]. Both GAMMA and D have been shown to be related to slowness (or snappiness) of the source, and we will explore their possible correlation with epicentral location and focal mechanism since the aftershock database comprises thrust, normal and strike-slip solutions.
DE: 4259 Ocean acoustics
DE: 7209 Earthquake dynamics and mechanics
SC: Union [U]
MN: 2005 Joint Assembly