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

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.

Keywords


Wellington region;changes on Coulombfailure stress;earthquake hazard

Full Text:

PDF

References


DOI: https://doi.org/10.4401/ag-3450
We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it (Read more).
Ok


Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X