The Canterbury Accelerograph Network (CanNet) and some Results from the September 2010, M7.1 Darfield Earthquake

The majority of the close-in accelerograms from the Mw7.1 September 4th, 2010 Darfield Earthquake were recorded by the local Canterbury Network (CanNet), which was being installed in the central South Island of New Zealand in anticipation of both a great earthquake on the Alpine Fault and moderate events on the Marlborough fault system. At the time of the earthquake, 36 of the planned 60 free field instruments were in place on the Canterbury Plains, in and surrounding the epicentral region, and across the nearby City of Christchurch. This paper presents a brief history of the network, and examines some results. The underlying policy of having a dense network of lowerresolution instruments rather than fewer high dynamic-range ones is clearly vindicated.

[1]  Jim Cousins,et al.  Overview of strong-motion data from the Darfield earthquake , 2010 .

[2]  Nicholas A Alexander,et al.  On Fling and Baseline Correction using Quadrature Mirror Filters , 2009 .

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

[4]  Ingrid Daubechies,et al.  Ten Lectures on Wavelets , 1992 .

[5]  H. Avery,et al.  THE CANTERBURY UNIVERSITY STRONG-MOTION RECORDING PROJECT , 2002 .

[6]  Nicholas A Alexander,et al.  Correcting data from an unknown accelerometer using recursive least squares and wavelet de-noising , 2007 .

[7]  A. A. Chanerley,et al.  Using the total least squares method for seismic correction of recordings from unknown instruments , 2008, Adv. Eng. Softw..

[8]  Misko Cubrinovski,et al.  Geotechnical reconnaissance of the 2010 Darfield (Canterbury) earthquake , 2010 .

[9]  Theoretical design and field deployment of a dense strong motion instrument network for the Alpine Fault, South Island, New Zealand. , 2003 .

[10]  P. Goldstein,et al.  Deterministic frequency‐wavenumber methods and direct measurements of rupture propagation during earthquakes using a dense array: Theory and methods , 1991 .

[11]  Mihailo D. Trifunac,et al.  Evolution of accelerographs, data processing, strong motion arrays and amplitude and spatial resolution in recording strong earthquake motion ☆ , 2001 .

[12]  Nicholas A Alexander,et al.  Obtaining estimates of the low-frequency ‘fling’, instrument tilts and displacement timeseries using wavelet decomposition , 2010 .

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

[14]  Caroline Holden,et al.  THE DARFIELD (CANTERBURY) EARTHQUAKE OF SEPTEMBER 2010: PRELIMINARY SEISMOLOGICAL REPORT , 2010 .