scholarly journals Peak ground accelerations recorded in the 1968 Inangahua earthquake and some attenuation implications

1993 ◽  
Vol 26 (3) ◽  
pp. 349-355 ◽  
Author(s):  
David J. Dowrick ◽  
S. Sritharan
Keyword(s):  
New Zealand ◽  
Strong Motion ◽  
Strong Motion Data ◽  
Western Usa ◽  
Motion Data ◽  
Information Gap ◽  
Wide Range ◽  
Peak Ground Accelerations ◽  
Attenuation Models

The Ms 7.4 1968 Inangahua earthquake was the largest New Zealand earthquake to have occurred from 1934 to 1992. The valuable strong motion data obtained on scratchplate acceleroscopes has not previously been adequately described. Filling that information gap, this paper lists the re-evaluated peak ground accelerations and examines their attenuation properties. It is shown that the accelerations from this event are much stronger over a wide range of source distances than those obtained using attenuation models for the western USA. Similar results have been found for a number of more recent New Zealand events in another study.

scholarly journals The 2003, Mw 7.2 Fiordland earthquake, and its near-source aftershock strong motion data

2004 ◽  
Vol 37 (3) ◽  
pp. 139-145
Author(s):  
P. McGinty
Keyword(s):  
New Zealand ◽  
Strong Motion ◽  
Data Set ◽  
Strong Motion Data ◽  
Preliminary Results ◽  
Motion Data ◽  
Magnitude Range ◽  
Source Data ◽  
Peak Ground Accelerations ◽  
Attenuation Models

The 2003 Fiordland earthquake was not only the best ever recorded subduction interface earthquake to occur in New Zealand, it also provided the opportunity to collect near-source strong-motion data produced by its aftershocks covering a wide magnitude range. Near source strong-motion data had been lacking in the New Zealand data set, on which current attenuation models are based. Here the author presents some preliminary results relating recorded peak ground accelerations in the near-source field to current attenuation models. The near-source data from the 2003 Fiordland earthquake sequence has shown that the observed data has a greater magnitude-dependence than that predicted by the current attenuation models. This new data will help to improve current models and will lead to a better understanding of the attenuation process associated with New Zealand subduction interface earthquakes.

scholarly journals Attenuation of peak ground accelerations in some recent New Zealand earthquakes

1993 ◽  
Vol 26 (1) ◽  
pp. 3-13 ◽  
Author(s):  
D. J. Dowrick ◽  
S. Sritharan
Keyword(s):  
New Zealand ◽  
Strong Motion ◽  
Medium Size ◽  
Data Sets ◽  
Fault Rupture ◽  
Motion Data ◽  
Peak Ground Accelerations ◽  
The Mean ◽  
Using Data ◽  
Event Based

The attenuation of peak ground accelerations was studied for eight New Zealand earthquakes which occurred in the period 1987 to 1991. These events were of medium size with moment magnitudes in the range Mw = 5.8 - 6.7, with depth to centroids of the fault rupture ranging from 4 to 60 km. Attenuation of peak ground accelerations was examined for each event, based on the slope distance from the rupture surface to each strong motion data site. The mean regression attenuation curve for each event was compared with those derived by others using data sets from other parts of the world, allowance being made for source mechanism and depth. Excepting the 1988 Te Anau event, the other seven New Zealand events as a set closely match a Japanese model, but give significantly stronger accelerations than those predicted by the models from western USA and Europe.

Applying Sun-Yuan liquefaction detection method in the February 2011 Christchurch (Mw 6.3) earthquake, New Zealand

2013 ◽  
Vol 46 (3) ◽  
pp. 157-166
Author(s):  
Rui Sun ◽  
Longwei Chen ◽  
Xiaoming Yuan
Keyword(s):  
New Zealand ◽  
Detection Method ◽  
Strong Motion ◽  
Seismic Acceleration ◽  
Strong Motion Data ◽  
Seismic Stations ◽  
The Real ◽  
Motion Data ◽  
Data Centre ◽  
New Approaches

In April 2011, 27 processed seismic acceleration records at 27 seismic stations whose epicental distances were less than 50 km in Feb. 22 Christchurch, New Zealand earthquake (Mw6.3), were collected from GeoNet strong motion data centre. Applying Sun-Yuan liquefaction detection method on the selected records, 9 liquefied sites and 18 non-liquefied sites were blindly identified thereof in May 2011, prior to the real liquefaction reports (papers) been published. Up to present, liquefaction detection results of 11 sites, i.e., 8 liquefied sites CBGS, CCCC, CHHC, CMHS, HPSC, PRPC, REHS and SHLC and 3 non-liquefied sites PPHS, HVSC and LPCC, were confirmed by publications which were consistent with the detections. New approaches and proof (or evidence) need to be pursued to demonstrate the detected results on other sites, i.e., liquefied site LINC and 15 non-liquefied sites.

scholarly journals Highlights of 30 years 
of strong-motion recording in New Zealand

1993 ◽  
Vol 26 (4) ◽  
pp. 375-389 ◽  
Author(s):  
W. J. Cousins
Keyword(s):  
New Zealand ◽  
Soil Structure ◽  
Soft Soil ◽  
Broad Band ◽  
Strong Motion ◽  
Moderate Intensity ◽  
Wide Range ◽  
Peak Ground Accelerations ◽  
Spectral Accelerations ◽  
Strong Motion Recording

Strong-motion recording has been carried out in New Zealand for somewhat more than 30 years. The largest network of instruments, comprising 220 accelerographs and 72 scratch-plate acceleroscopes, is operated by the Institute of Geological and Nuclear Sciences. During the last 30 years the IGNS network has yielded a little over 2000 records, 1600 of which have been matched with earthquake events to give a substantial body of New Zealand data that is currently being used in studies of attenuation and microzonation. The highest peak ground accelerations recorded to date on scratch-plates and accelerographs are respectively 0.6g (from Reefton during the 1968 Inangahua earthquake) and 0.4g (from Dannevirke from the Weber earthquake of 13th May 1990). About 300 of the more significant accelerograms have been digitized and computer processed to give data sets suitable for use in aseismic structural design, and studies of the attenuation of spectral acceleration, soil-structure interactions, structural responses, and microzonation. Peak ground accelerations from New Zealand earthquakes appear to be stronger, over a wide range of source distances, than predicted from attenuation models applicable to the Western USA. Spectral accelerations in New Zealand appear to modelled well by a model based on Japanese data, but some caution is needed as the New Zealand data base of spectral accelerations is small and deficient in near source data from moderate to large earthquakes. Strong-motion records from deep or soft soil sites, and from arrays of recorders in the Wellington region, have shown both resonant and broad-band amplification for rock input motions of small to moderate intensity. Sets of records from arrays of accelerographs in three medium-rise buildings have revealed the effects of soil-structure interactions, and records from an array of 5 accelerographs on Matahina dam showed that part of the dam responded in a strongly nonlinear fashion during the 1987 Edgecumbe earthquake.

Processed strong-motion data for the El Salvador earthquake of June 19, 1982

1988 ◽  
Author(s):  
Kenneth W. Campbell ◽  
Sylvester Theodore Algermissen
Keyword(s):  
El Salvador ◽  
Strong Motion ◽  
Strong Motion Data ◽  
Motion Data
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