A photograph of an access hole in the middle of a road in the Horseshoe Lake District which has raised above the surface of the road. White spray-paint and a road cone have been used to alert drivers of the uneven surface.
A photograph of surface flooding on Anzac Drive in Bexley.
A photograph of surface flooding on Telegraph Road in Darfield.
A photograph of surface flooding on Anzac Drive in Bexley.
A photograph of surface flooding on Anzac Drive in Bexley.
A large crack in the road surface in Kaiapoi, surrounded by liquefaction.
Damage to the asphalt surface of a car park in Kaiapoi.
A damaged road surface filled in with gravel. In the background is a cemetery.
A photograph of the undulating surface of Main Road in Mt Pleasant.
A photograph of cracks and liquefaction in the surface of Hagley Park.
A photograph of the undulating surface of Main Road in Mt Pleasant.
A photograph of cracks and liquefaction in the surface of Hagley Park.
Liquefaction in a horse paddock. In the foreground cracks are visible in the road surface.
A photograph of the warped surface of a car park in Antigua Street.
Despite the relatively low seismicity, a large earthquake in the Waikato region is expected to have a high impact, when the fourth-largest regional population and economy and the high density critical infrastructure systems in this region are considered. Furthermore, Waikato has a deep soft sedimentary basin, which increases the regional seismic hazard due to trapping and amplification of seismic waves and generation of localized surface waves within the basin. This phenomenon is known as the “Basin Effect”, and has been attributed to the increased damage in several historic earthquakes, including the 2010-2011 Canterbury earthquakes. In order to quantitatively model the basin response and improve the understanding of regional seismic hazard, geophysical methods will be used to develop shear wave velocity profiles across the Waikato basin. Active surface wave methods involve the deployment of linear arrays of geophones to record the surface waves generated by a sledge hammer. Passive surface wave methods involve the deployment of two-dimensional seismometer arrays to record ambient vibrations. At each site, the planned testing includes one active test and two to four passive arrays. The obtained data are processed to develop dispersion curves, which describe surface wave propagation velocity as a function of frequency (or wavelength). Dispersion curves are then inverted using the Geopsy software package to develop a suite of shear wave velocity profiles. Currently, more than ten sites in Waikato are under consideration for this project. This poster presents the preliminary results from the two sites that have been tested. The shear wave velocity profiles from all sites will be used to produce a 3D velocity model for the Waikato basin, a part of QuakeCoRE flagship programme 1.
A photograph of liquefaction and surface flooding around a lamp post near Anzac Drive in Bexley.
Peraki Street in Kaiapoi, near the railway level crossing. The road and footpath surfaces are cracked and buckled.
Peraki Street in Kaiapoi, near the railway level crossing. The road and footpath surfaces are cracked and buckled.
Peraki Street in Kaiapoi, near the railway level crossing. The road and footpath surfaces are cracked and buckled.
A photograph of cracks in pavement, with silt from liquefaction visible on the surface.
Workers repairing power lines on Settlers Crescent in Ferrymead. Liquefaction silt can be seen on the road surface.
A photograph of damaged road surface. The photograph is captioned by Paul Corliss, "River Road, Avonside".
A photograph of UC Geology students inspecting liquefaction and surface flooding around a lamp post near Anzac Drive in Bexley.
A large crack runs across Avonside Drive. Water is visible in the bottom of the crack, and there is flooding on the road surface.
Signs at the entrance to the Gap Filler Pallet Pavilion read "No heels. No smoking. No climbing. Uneven surface please take care".
A damaged footpath in the Christchurch Botanic Gardens. Two orange cones have been placed on the damaged concrete to warn people of the uneven surface.
Damage to the footpath on Hereford Street. Yellow zigzags have been spray painted on the round to warn people of the irregular surface.
A woman inspecting a crack in the footpath in Avonside. Cones on either side warn pedestrians and cyclists of the uneven surface.
A man walks across his cracked and liquefaction-covered lawn in Richmond. The photographer comments, "Andy Corbin checks liquefaction and surface water in his lawn".
Cars slow for road works on Lineside Road, outside Kaiapoi, near the intersection with Revells Road. A truck is dumping gravel to fill cracks in the road surface.