HR: 14:40h
AN: S52H-05    [PDF]
TI: Earthquake Processes of the 1995 Waitangi Day Sequence, offshore, North Island, New Zealand
AU: * Trevino, L
EM: trevino@geo.utep.edu
AF: University of Texas at El Paso, 500W. University Ave., El Paso, Tx 79902
AU: Doser, D
EM: doser@geo.utep.edu
AF: University of Texas at El Paso, 500W. University Ave., El Paso, Tx 79902
AB: The 1995 (February 5) Waitangi Day sequence, offshore North Island, New Zealand, began with a magnitude 7.0 mainshock and was followed by 21 smaller events within the first 24 hours of the main rupture. Over the next three weeks a prolific aftershock sequence ($> 800$ events) continued in the outer rise and trench of the Hikurangi margin. The New Zealand Digital Seismic Network recorded over 1200 events of this sequence were relocated using HypoDD. Results indicate the sequence progressed from north to south. Focal mechanisms from the Harvard CMT catalog suggest normal faulting at shallow depths within the subducting slab. Future work will concentrate determining the stress regime in the area of study and use of empirical Green's functions to determine the directivity of the mainshock. Broadband data is also available and will be used to determine focal mechanisms for the aftershock sequence.
DE: 7200 SEISMOLOGY
SC: Seismology [S]
MN: 2003 Fall Meeting