Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414305r&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 14, CiteID L14305
Physics
7
Geodesy And Gravity: Seismic Cycle Related Deformations (6924, 7209, 7223, 7230), Seismology: Earthquake Interaction, Forecasting, And Prediction (1217, 1242), Seismology: Subduction Zones (1207, 1219, 1240)
Scientific paper
An earthquake swarm in the crust of the subducted plate in the southern Hikurangi subduction zone in April-May 2004 was most likely triggered by slow slip at the plate interface directly downdip during the previous year. Double-difference relocation indicates that the swarm represents incremental slip on adjacent patches of the same fault. A subsequent M L 5.5 earthquake in January 2005 occurred on a separate, deeper fault, sub-parallel to that of the 2004 swarm, but separated from it by about 1 km. This suggests a rapid decrease in mechanical damage in the slab with depth below the plate interface. The normal faulting observed in both earthquake sequences represents unbending of the subducted plate. Such unbending may be diagnostic of deformation on the deeper edge of a strongly coupled region of the plate interface resulting from adjacent slow slip.
Bannister Stephen
Reyners Martin
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