scholarly journals Revised isoseismal maps for the 1956 Bay of Plenty and 1987 Edgecumbe, New Zealand, earthquakes

2007 ◽  
Vol 40 (4) ◽  
pp. 200-206
Author(s):  
David J. Dowrick
Keyword(s):  
New Zealand ◽  
Important Implication ◽  
Strong Influence ◽  
Taupo Volcanic Zone ◽  
Volcanic Zone ◽  
High Attenuation ◽  
Damage Costs ◽  
Hazard And Risk ◽  
The Mean ◽  
Isoseismal Maps

The Modified Mercalli intensities of the 1956 Mw 6.3 Bay of Plenty and 1987 Mw 6.5 Edgecumbe earthquakes have recently been reviewed and about one-third of them were found to be erroneous. The resulting revisions to their isoseismal maps are substantial, and both new maps now show the strong influence of the high attenuation in the Taupo Volcanic Zone (TVZ). An analysis of the causes of the errors in the intensities is given. The new maps will help improve the modelling of attenuation in the TVZ, and will contribute to improvements in assessments of seismic hazard and risk in that region. An important implication is that the mean damage ratios estimated from studies of damage costs in the Edgecumbe earthquake by Dowrick and Rhoades are likely to be erroneously low, and need to be reviewed.

scholarly journals A model for the attenuation of peak ground acceleration in New Zealand earthquakes based on seismograph and accelerograph data

1999 ◽  
Vol 32 (4) ◽  
pp. 193-220 ◽  
Author(s):  
W. J. Cousins ◽  
J. X. Zhao ◽  
N. D. Perrin
Keyword(s):  
New Zealand ◽  
Peak Ground Acceleration ◽  
Strong Motion ◽  
Taupo Volcanic Zone ◽  
Weak Rock ◽  
Volcanic Zone ◽  
Ground Acceleration ◽  
High Attenuation ◽  
The North ◽  
Strong Rock

A combination of weak-motion velocity data from seismographs and strong-motion acceleration data from accelerographs has been used to model the attenuation of peak ground acceleration (PGA) in New Zealand earthquakes. The resulting model extends the PGA attenuation model of Zhao, Dowrick and McVerry [30] to include the variability of rock strength, and also describes the unusually high attenuation in the volcanic zone of the North Island of New Zealand. Strong-rock sites were found to experience lower PGAs than either weak rock or soil sites for magnitudes below Mw 7, and the apparent degree of amplification on going from strong rock to weak rock or soil decreased as the magnitude increased from Mw 5 to Mw 7. At magnitude 7 the PGAs were very similar for all site classes for source distances up to 100 km. When extrapolated to magnitudes beyond the maximum of the data, Mw 7.4, the model predicted that PGAs for strong rock sites were greater than for weak rock or soil sites. The so-called "whole Taupo Volcanic Zone" was found to provide a good boundary for the zone of high attenuation in the volcanic region of the North Island. The high attenuation was successfully modelled as a simple function of the length of travel path through the zone of high attenuation. Over the effective maximum volcanic path length of about 70 km the extra attenuation resulted in a factor of ten reduction in PGA compared with non-volcanic paths of the same length.

FAVORABLE STRUCTURAL SETTINGS FOR POTENTIAL GEOTHERMAL UPWELLINGS IN THE CENTRAL TAUPO VOLCANIC ZONE, NEW ZEALAND

2018 ◽  
Author(s):  
Natalie E. Wigger ◽  
◽  
James E. Faulds ◽  
Samuel J. Hampton ◽  
Josh W. Borella ◽  
...  
Keyword(s):  
New Zealand ◽  
Taupo Volcanic Zone ◽  
Volcanic Zone

scholarly journals Physical property relationships of the Rotokawa Andesite, a significant geothermal reservoir rock in the Taupo Volcanic Zone, New Zealand

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Paul A Siratovich ◽  
Michael J Heap ◽  
Marlène C Villenueve ◽  
James W Cole ◽  
Thierry Reuschlé
Keyword(s):  
New Zealand ◽  
Physical Property ◽  
Geothermal Reservoir ◽  
Reservoir Rock ◽  
Taupo Volcanic Zone ◽  
Volcanic Zone
Sign in / Sign up

Export Citation Format

Share Document