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

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Z. Han

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.

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How to Cite
1.
Han Z. 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. Ann. Geophys. [Internet]. 2003Dec.25 [cited 2021Jun.23];46(5). Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/3450
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