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
Abstract
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.
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.
Keywords
Wellington region;changes on Coulombfailure stress;earthquake hazard
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- DOI: 10.4401/ag-3450
This work is licensed under a Creative Commons Attribution 3.0 License.
ISSN: 2037-416X