New Zealand Journal of Geology and Geophysics abstracts
Statistical modelling of seismicity patterns before and after the 1990 Oct 5
Cape Palliser earthquake, New Zealand
JIANCANG ZHUANG
Centre for Analysis and Prediction
China Seismological Bureau
P.O. Box 166
Beijing 10036, China
Abstract The earthquake sequence for this study occurred off
Cape Palliser at the southeastern tip of the North Island of New Zealand. Two
main events occurred, on 1990 Oct 5 and 1990 Oct 6, both with local magnitude
ML5.3. They were accompanied by a large number of aftershocks. The
sequence is remarkable in that it broke the region of low seismicity in the
area between the Hikurangi Trough and the main faults in the Wellington region.
This paper studies the seismicity during the period 1978-96. The ETAS model is
applied to the data. The whole period can be divided into four stages: early
background period, relatively quiescent period, mainshock and the aftershock
sequence, and active period of post-aftershocks. In order to detect the
quiescence, residual analysis from the ETAS model was applied to minimise the
effect due to previous aftershock clusters. To explain all features in this
sequence, a seismicity phase hypothesis is proposed.
The paper discusses aspects of the sequence including background,
spatial-temporal analysis, ETAS model, relative quiescence, residual analysis,
and its application to the data.
Keywords Cape Palliser; earthquake; ETAS model; quiescence;
residual point process
New Zealand Journal of Geology & Geophysics, 2000, Vol. 43:
447-460
0028-8306/00/4303-0447 $7.00/0 (c) The Royal Society of New Zealand
2000
PDF file of entire paper: medium quality (1098K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
