Your report will include:
Most of this information is available in reports or maps on our hazard pages, or on Canterbury Maps.
We provide information on the location and characteristics of any known earthquake faults on a property in Land Information Requests. Earthquake faults can cause damaging earthquakes, which if large enough, can cause permanent horizontal and/or vertical offset or warping of land across the fault trace (the line where the fault meets the ground surface).
The accuracy of fault trace locations depend on the scale they were mapped at, which varies throughout the region. Most of the faults in the region are mapped at 1:250,000 or 1:50,000 scale. A few faults have been mapped at scales of less than 1:20,000. Information on fault type, slip rate, average displacement and recurrence interval (long-term average time between earthquakes on the fault) is available for most of the faults, and information on the timing of the last earthquake on the fault is available for some.
All our information on earthquake faults in Canterbury, including reports and maps for Hurunui, Waimakariri, Selwyn, Ashburton and Mackenzie districts can be found on our earthquake fault information page. Note that there are no earthquake faults that reach the ground surface in Christchurch City (the faults under Christchurch are all completely underground). Interactive maps of known earthquake faults in the Canterbury region will soon be available on Canterbury Maps.
We provide expected ground shaking intensities for the general area of a property for 50 year and 475 year return periods in Land Information Requests. This is given as Modified Mercalli intensities.
We also hold information on the level of ground shaking expected in Canterbury as Modified Mercalli intensities for 150 and 1000 year return periods, and as peak ground accelerations and spectral accelerations for 50, 150, 475 and 1000 year return periods.
This probabilistic ground shaking information is calculated from modelling the likely frequency and size of earthquakes that may be generated by 133 known earthquake faults in and near Canterbury, along with historic seismicity. This information was produced in 2006, before the 2010/11 Canterbury earthquakes - the ground shaking hazard is now higher in the central Canterbury/Christchurch area because of the continuing (but decreasing) chance of aftershocks over the coming years.The ground shaking hazard was modelled at a regional scale and assumes that the rocks and soils are the same across the region. In reality, local conditions such as soil type and depth, as well as local topography, can either amplify or lessen the level of ground shaking at a particular location.
All our ground shaking hazard information is available in reports and maps on our Canterbury's earthquake hazard page and as interactive maps on Canterbury Maps.
We provide information on the general liquefaction potential of soils in the area of the property in Land Information Requests. We also provide information on whether liquefaction occurred on the property during the September 2010 or February 2011 earthquakes. Liquefaction is a process that causes some soils to behave more like a liquid than a solid during a strong earthquake shaking. It only occurs in loose, wet soils (below the water table).
Most of the liquefaction potential information we hold is based primarily on geological information, which means it can only give an indication of whether the types of soil in a general area are susceptible to liquefaction during a strong earthquake. We do not have geotechnical information for individual properties (this would be extremely expensive to collect), so cannot say whether an individual property is susceptible to liquefaction or not. This can only be determined through a site-specific geotechnical investigation.
All our liquefaction information is available in reports and maps on our liquefaction information page and as interactive maps on Canterbury Maps.
We provide information on tsunami hazards for coastal properties in Land Information Requests, where this information is available.
Distant-source (from across the Pacific Ocean) tsunami information is available for most of the Canterbury coastline, and some local-source (from close to shore) tsunami information is available for the Kaikoura coast.
Information on Canterbury's tsunami hazard can be found on our tsunami pages, including all our reports and maps on distant-source tsunamis. Interactive maps for distant-source tsunami hazards will soon be available on Canterbury Maps.
We provide information on earthquake-induced landslide hazard for the general area of the property in Land Information Requests, where available, if the property is in a hilly area.
Most of the earthquake-induced landslide hazard information we hold is based primarily on topography and geological information, which means it can only give an indication of whether slopes in a general area are susceptible to landsliding during a strong earthquake. We do not have geotechnical information for individual properties (this would be extremely expensive to collect), so cannot say whether an individual property is susceptible to landslides or not. This can only be determined through a site-specific geotechnical investigation.
All our earthquake-induced landslide hazard information is taken from district earthquake hazard assessments which are available on request from Environment Canterbury Customer Services.
We hold information on historic earthquakes and tsunamis that have affected the Canterbury region, including:
We have information on the potential impact of selected earthquake scenarios including Alpine Fault, Ostler Fault, Hunters Hills Fault, Canterbury Range Front Fault, Porters Pass–Amberley Fault Zone and Hope Fault earthquakes.
Your city or district council may also hold more detailed geological hazard information for the site of interest, or nearby sites.
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