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What caused the spatial variability of strong ground motions near the epic…
Research papers, University of Canterbury Library
During the 2011 M7.8 Kaikōura earthquake, ground motions recorded near the epicentre showed a significant spatial variation. The Te Mara farm (WTMC) station, the nearest to the epicentre, recorded 1g and 2.7g of horizontal and vertical peak ground accelerations (PGA), respectively. The nearby Waiu Gorge (WIGC) station recorded a horizontal PGA of 0.8g. Interestingly, however, the Culverden Airlie Farm (CULC) station that was very closely located to WIGC recorded a horizontal PGA of only 0.25g. This poster demonstrates how the local geological condition could have contributed to the spatially variable ground motions observed in the North Canterbury, based on the results of recently conducted geophysical investigations. The surficial geology of this area is dominated by alluvial gravel deposits with traces of silt. A borehole log showed that the thickness of the sediments at WTMC is over 76 metres. Interestingly, the shear wave velocity (Vs) profiles obtained from the three strong motion sites suggest unusually high shear wave velocity of the gravelly sediments. The velocity of sediments and the lack of clear peaks in the horizontal-to-vertical (H/V) spectral ratio at WTMC suggest that the large ground motion observed at this station was likely caused by the proximity of the station to the causative fault itself; the site effect was likely insignificant. Comparisons of H/V spectral ratios and Vs profiles suggest that the sediment thickness is much smaller at WIGC compared with CULC; the high PGA at WIGC was likely influenced by the high-frequency amplification caused by the response of shallow sediments.
BeckerFraserPhotos June 2012 photograph 402
Images, UC QuakeStudies
Photograph captioned by BeckerFraserPhotos, "The entire north side of Tuam Street from High Street to Madras Street which is now clear ground".
BeckerFraserPhotos July 2011 photograph 813
Images, UC QuakeStudies
A photograph of paving stones lying loose on the ground. The photograph is captioned by BeckerFraserPhotos, "Hereford Street, near the Hanafins Building".
BeckerFraserPhotos April 2011 photograph 058
Images, UC QuakeStudies
Cordon fencing around the damaged Ground Culinary Centre and cafe. Bricks have crumbled from the walls and remain piled up on the footpath.
BeckerFraserPhotos February 2012 photograph 0012
Images, UC QuakeStudies
A photograph captioned by BeckerFraserPhotos, "The swimming pool has lifted completely out of the ground at 1 Azalea Place, Kaiapoi".
Photo by Jennifer Middendorf 007
Images, UC QuakeStudies
The Rolleston Avenue side of the Arts Centre, cordoned off. The turret from one of the towers is on the ground to prevent further damage.
BeckerFraserPhotos June 2012 photograph 403
Images, UC QuakeStudies
Photograph captioned by BeckerFraserPhotos, "The entire north side of Tuam Street from High Street to Madras Street which is now clear ground".
BeckerFraserPhotos May 2012 photograph 334
Images, UC QuakeStudies
Photograph captioned by BeckerFraserPhotos, "Avonside Drive. The swimming pool is still sitting above ground, where the earthquake lifted it back in September, 2010".
BeckerFraserPhotos May 2013 photograph 048
Images, UC QuakeStudies
An abandoned residential property at 20 Seabreeze Close in Bexley. Weeds are growing through the cracks in the ground and the yard has become overgrown.
BeckerFraserPhotos April 2011 photograph 078
Images, UC QuakeStudies
Damage to the Christchurch School of Music building. The gable on the building has crumbled and bricks can be seen along the ground.
BeckerFraserPhotos April 2011 photograph 082
Images, UC QuakeStudies
Damage to the Christchurch School of Music building. The gable on the building has crumbled and bricks can be seen along the ground.
BeckerFraserPhotos April 2011 photograph 084
Images, UC QuakeStudies
Damage to the Christchurch School of Music building. The gable on the building has crumbled and bricks can be seen along the ground.
BeckerFraserPhotos April 2011 photograph 083
Images, UC QuakeStudies
Damage to the Christchurch School of Music building. The gable on the building has crumbled and bricks can be seen along the ground.
BeckerFraserPhotos April 2011 photograph 080
Images, UC QuakeStudies
Damage to the Christchurch School of Music building. The gable on the building has crumbled and bricks can be seen along the ground.
BeckerFraserPhotos October 2010 photograph 097
Images, UC QuakeStudies
A house in Hororata. The chimney has fallen, taking the fence with it. Part of it can still be seen lying on the ground.
BeckerFraserPhotos May 2011 photograph 0671
Images, UC QuakeStudies
The top portion of this building on Manchester Street has fallen away, littering the ground below. USAR codes have been spray painted on the walls and footpath.
BeckerFraserPhotos April 2011 photograph 262
Images, UC QuakeStudies
Rubble lying on the ground in front of the main entrance of the Peterborough Apartments. The rubble is from the top of the front gable above.
BeckerFraserPhotos April 2011 photograph 081
Images, UC QuakeStudies
Damage to the Christchurch School of Music building. The gable on the building has crumbled and bricks can be seen along the ground.
BeckerFraserPhotos October 2011 photograph 383
Images, UC QuakeStudies
The ground floor of the Central Library on Gloucester Street. Books have fallen off the shelves and are in piles in the aisles.
Paul and Sam Corliss's Street Art Photograph (2013:05:04 13:20:07)
Images, UC QuakeStudies
A photograph of an advertising image in the window of Sugar Hair and Beauty, on the ground floor of the Inland Revenue Building.
BeckerFraserPhotos February 2011 photograph 329
Images, UC QuakeStudies
Bare patches of ground at Sullivan Park in Avonside. The bare patches mark where liquefaction covered the grass after the 4 September 2010 earthquake.
BeckerFraserPhotos December 2011 photograph 2045
Images, UC QuakeStudies
A photograph captioned by BeckerFraserPhotos, "The Cupola from Our City, O-Tautahi (former Municipal Chambers), removed and braced on the ground outside".
Strong Ground Motion Simulations for Dunedin: First Steps using the SCEC B…
Research papers, University of Canterbury Library
Our poster will present on-going QuakeCoRE-founded work on strong motion seismology for Dunedin-Mosgiel area, focusing on ground motion simulations for Dunedin Central Business District (CBD). Source modelling and ground motion simulations are being carried out using the SCEC (Southern California Earthquakes Center) Broad Band simulation Platform (BBP). The platform computes broadband (0-10 Hz) seismograms for earthquakes and was first implemented at the University of Otago in 2016. As large earthquakes has not been experienced in Dunedin in the time of period of instrumental recording, user-specified scenario simulations are of great value. The Akatore Fault, the most active fault in Otago and closest major fault to Dunedin, is the source focused on in the present study. Simulations for various Akatore Fault source scenarios are run and presented. Path and site effects are key components considered in the simulation process. A 1D shear wave velocity profile is required by SCEC BBP, and this is being generated to represent the Akatore-to-CBD path and site within the BBP. A 3D shear velocity model, with high resolution within Dunedin CBD, is being developed in parallel with this study (see Sangster et al. poster). This model will be the basis for developing a 3D shear wave velocity model for greater Dunedin-Mosgiel area for future ground motion simulations, using Canterbury software (currently under development).
BeckerFraserPhotos May 2013 photograph 046
Images, UC QuakeStudies
An abandoned residential property at 16 Seabreeze Close in Bexley. Weeds are growing through the cracks in the ground and a window has been vandalised with graffiti.
BeckerFraserPhotos May 2013 photograph 047
Images, UC QuakeStudies
An abandoned residential property at 18 Seabreeze Close in Bexley. Weeds are growing through the cracks in the ground and the yard has become overgrown.
BeckerFraserPhotos July 2011 photograph 1179
Images, UC QuakeStudies
A photograph of the interior of the Hotel Grand Chancellor. The photograph is captioned by BeckerFraserPhotos, "The ground floor of the Hotel Grand Chancellor".
BeckerFraserPhotos February 2012 photograph 0332
Images, UC QuakeStudies
A photograph captioned by BeckerFraserPhotos, "Ground floor of the Holiday Inn. We could see piles of different types of materials sorted and bagged through the windows here".
Photo by Jennifer Middendorf 209
Images, UC QuakeStudies
The east side of the Odeon Theatre, showing the severe damage at the back of the theatre. Part of the roof sits on the ground in the section next door.
BeckerFraserPhotos July 2011 photograph 1180
Images, UC QuakeStudies
A photograph of the interior of the Hotel Grand Chancellor. The photograph is captioned by BeckerFraserPhotos, "The ground floor of the Hotel Grand Chancellor".
BeckerFraserPhotos April 2011 photograph 057
Images, UC QuakeStudies
A view over cordon fencing towards the damaged Ground Culinary Centre and cafe. Bricks have crumbled from the walls and remain piled up on the footpath.