SEISMIC HAZARD OF THE CANTERBURY REGION, NEW ZEALAND: NEW EARTHQUAKE SOURCE MODEL AND METHODOLOGY

SUMMARY We present a new probabilistic seismic hazard model for the Canterbury region, the model superseding the earlier model of Stirling et al. (1999, 2001). The updated model incorporates new onshore and offshore fault data, new seismicity data, new methods for the earthquake source parameterisation of both datasets, and new methods for estimation of the expected levels of Modified Mercalli Intensity (MMI) across the region. While the overall regional pattern of estimated hazard has not changed since the earlier seismic hazard model, there have been slight reductions in hazard in some areas (western Canterbury Plains and eastern Southern Alps), coupled with significant increases in hazard in one area (immediately northeast of Kaikoura). The changes to estimated acceleration for the new versus older model serve to show the extent that major changes to a multidisciplinary source model may impact the final estimates of hazard, while the new MMI estimates show the added impact of a new methodology for calculating MMI hazard.

[1]  A. Nicol,et al.  Holocene paleoearthquakes on the strike‐slip Porters Pass Fault, Canterbury, New Zealand , 2005 .

[2]  Matthew C. Gerstenberger,et al.  Updated Probabilistic Seismic Hazard Assessment for the Canterbury Region , 2007 .

[3]  R. Norris,et al.  Late quaternary slip rates and slip partitioning on the Alpine Fault , 2001 .

[4]  Warwick D. Smith.  Earthquake Hazard and Risk Assessment in New Zealand by Monte Carlo Methods , 2003 .

[5]  M. Yetton.  The probability and consequences of the next alpine fault earthquake, South Island, New Zealand , 2000 .

[6]  David D. Jackson,et al.  Seismic hazards in southern California: probable earthquakes, 1994 to 2024 , 1996 .

[7]  T. Little,et al.  Rupturing of the Awatere Fault during the 1848 October 16 Marlborough earthquake, New Zealand: Historical and present day evidence , 1998 .

[8]  Steven G. Wesnousky,et al.  Earthquakes, quaternary faults, and seismic hazard in California , 1986 .

[9]  Paul G. Richards,et al.  Quantitative Seismology: Theory and Methods , 1980 .

[10]  W. New,et al.  Standards New Zealand. , 2005 .

[11]  N. Abrahamson,et al.  Empirical Response Spectral Attenuation Relations for Shallow Crustal Earthquakes , 1997 .

[12]  R. V. Van Dissen,et al.  Estimates of the time‐varying hazard of rupture of the Alpine Fault, New Zealand, allowing for uncertainties , 2003 .

[13]  Thomas C. Hanks,et al.  A Bilinear Source-Scaling Model for M-log A Observations of Continental Earthquakes , 2002 .

[14]  W. Silva,et al.  Strong Ground Motion Attenuation Relationships for Subduction Zone Earthquakes , 1997 .

[15]  R. Langridge,et al.  Paleoseismology and slip rate of the Conway Segment of the Hope Faultat Greenburn Stream, South Island, New Zealand , 2003 .

[16]  B. Gutenberg,et al.  Frequency of Earthquakes in California , 1944, Nature.

[17]  C. Cornell.  Engineering seismic risk analysis , 1968 .

[18]  Kelvin Berryman,et al.  A New Seismic Hazard Model for New Zealand , 2002 .

[19]  Norman A. Abrahamson,et al.  New Zealand acceleration response spectrum attenuation relations for crustal and subduction zone earthquakes , 2006 .

[20]  Richard G. Gordon,et al.  Current plate motions , 1990 .

[21]  R. Sutherland,et al.  Late Quaternary displacement rate, paleoseismicity, and geomorphic evolution of the Alpine Fault: Evidence from Hokuri Creek, South Westland, New Zealand , 1995 .

[22]  R. Dissen,et al.  Earthquake Source Identification and Characterisation for the Canterbury Region, South Island, New Zealand , 2001 .

[23]  H. Cowan.  The North Canterbury earthquake of September 1, 1888 , 1991 .

[24]  K. Berryman,et al.  Surface rupture of the Poulter Fault in the 1929 March 9 Arthur's Pass earthquake, and redefinition of the Kakapo Fault, New Zealand , 2004 .

[25]  Kelvin Berryman,et al.  Probabilistic seismic hazard assessment of the Canterbury region, New Zealand , 2001 .

[26]  H. Kanamori,et al.  A moment magnitude scale , 1979 .

[27]  Euan G. C. Smith,et al.  Comparison of Seismicity Models Generated by Different Kernel Estimations , 2002 .