Possible reduction of earthquake hazard on the Wellington Fault, New Zealand, after the nearby 1855, M 8.2 Wairarapa earthquake and implication for interpreting paleoearthquake intervals

oleh: Z. Han

Format: Article
Diterbitkan: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2003-06-01

Deskripsi

Based on the indicative modelling, the changes in Coulomb failure function (?CFS) suggest that the W-HV segment
 and the T-P segment could be stable in at least the future 300 years and 190 years respectively, for these
 periods should be needed to accumulate the stress released by the M 8.2 Wairarapa earthquake, assuming that
 there is no influence from other sources, the earthquake did not alter the failure threshold, and that failure is a
 fairly deterministic process. The results also show that the influence on the W-HV segment and T-P segment of
 the Wellington Fault caused by the 1855, M 8.2 Wairarapa earthquake is significant considering that the average
 fault rupture recurrence interval on the Wellington Fault is about 500-770 years. With our present understanding
 of the Wellington and Wairarapa faults, it can be concluded that the 1855 Wairarapa earthquake retarded earthquake
 occurrence on the W-HV segment and the T-P segment of the Wellington Fault. Thus the seismic hazard
 in the Wellington region may be over-estimated.