The map shading shows how the distribution of liquefaction damage varies across the city for each scenario. For those who need to visit our offices, restrictions will be in place, including physical distancing, all visitors required to sign in and out, and encouraging visitors to register using the COVID-19 tracing app. Need Help? Sitting across the boundary of the Pacific and Australian tectonic plates makes Canterbury an active landscape. Input from geotech engineer contigent on results of desktop assessment. Click here for all our reports on earthquake faults, earthquake shaking and liquefaction susceptibility. We can show you where the earthquake faults are and what areas are more likely to shake. How do I know if I need to do a geotechnical investigation to reduce risk to my property? These maps have been prepared under the auspices of the National … Updated quake map tells you if you live in a liquefaction zone It also highlights areas at risk of landslides. Explore. Contains 6 items . Layer: Mapped Liquefaction - Feb 2011 (ID: 1) Name: Mapped Liquefaction - Feb 2011 Display Field: GROUP_ Type: Feature Layer Geometry Type: esriGeometryPolygon Description: Liquefaction mapping from aerial and satellite photos and site visit data following the Christchurch Earthquake on 22 February 2011, also incorporating data from external review comments. https://www.ecan.govt.nz/.../natural-hazards/earthquakes/liquefaction Liquefaction, a process in which loose, granular soils below the ground water table temporarily lose strength during strong earthquake shaking, has been the cause of considerable damage during earthquakes. Find out what causes liquefaction and which areas are more or less susceptible. Liquefaction damage is unlikely (very low liquefaction vulnerability). The rising water takes silt and sand with it, forming sand boils or volcanos. To provide a micro- zonation of this hazard, maps have been prepared for various subregions of the United States. The 2012 eastern Canterbury report replaced older liquefaction susceptibility reports for coastal Waimakariri (2000) and Christchurch (2005). Liquefied soils can move sideways, usually towards streams or rivers, or downhill towards lower ground. Liquefaction research: Detailed reports for areas within Canterbury, Environment Canterbury and territorial authorities carry out research so our, region and our communities better understand risk and can proactively respond to natural hazards. We also encourage everyone to wear a mask, in line with government guidance. Map Viewer. Liquefaction occurrence - February 2011 Christchurch Earthquake (1) Liquefaction occurrence November 2016 (24) Canterbury historic liquefaction occurance (22) Eastern Canterbury liquefaction susceptibility line (2012) (2) Eastern Canterbury liquefaction susceptibility (2012) (3) Kaikoura liquefaction susceptibility (2019) (20) This layer delineates zones of liquefaction susceptibility in the Kaikoura region. Grid List . U02/22 Please find enclosed eleven final copies (one unbound and ten bound) of our report titled “Christchurch Liquefaction Study – Stage II”. Unable to load //ecan.maps.arcgis.com/sharing/rest/portals/self?f=json status: 0 Liquefaction susceptibility maps for other districts are included in district earthquake hazard assessments. Liquefaction Studies (ECan) The Waimakariri and Christchurch liquefaction studies (2000-2005), are Environment Canterbury’s most detailed analyses of liquefaction susceptibility. The maps are mainly based on the underlying geology (for example, rock, old river gravels, relatively young estuary silts) and on borehole and groundwater information (depth to the water table). However, we prefer – where possible – that you contact us on 0800 324 636 (8am-5pm) or via our contact us page. Within these areas soils can change a lot over very short distances, even from one neighbouring property to another, because of the way sediments were laid down by different river, estuary or beach processes. This dataset delineates zones of liquefaction susceptibility in the Selwyn region. This dataset outlines liquefaction zones as defined in Figure 2.1 of Brackley (comp), 2012, Review of liquefaction hazard information in eastern Canterbury. COVID-19: Alert Level 2 - Environment Canterbury offices are open, At Alert Level 2, our Tuam Street and Timaru offices will be open to the public as normal, Monday-Friday, 8am-5pm (Christchurch) and 8.30am-5.00pm (Timaru). Last updated . Subscribe. We map earthquake faults and where land is susceptible to liquefaction. What exactly is the grey sludge that oozes up through the ground during earthquake shaking? Maps and data; Farming news ; Farming events; Industry support; Biodiversity-biosecurity; Rural Professionals; Plans, strategies and bylaws; Working with Ngāi Tahu; Do it Online. Liquefaction is the process which causes soil to behave more like a liquid than a solid during an earthquake. In areas where the underlying geology and groundwater information indicate that damaging liquefaction is possible, your city or district council may require you to get a site-specific geotechnical investigation as part of a subdivision or building consent. qsr-collection:170 . See Christchurch City Council's liquefaction information viewer, For other areas in Canterbury, see our liquefaction storymap. Liquefaction is a natural process where earthquake shaking increases the water pressure in the ground causing some soils to behave like a fluid, resulting in temporary loss of soil strength. We also encourage everyone to wear a mask, in line with government guidance. Soil deposits are naturally variable, so the severity of liquefaction damage will vary across an area. Liquefaction usually only happens in susceptible soils in moderate to strong ground shaking (when it is difficult to stand up, things are being moved around, and buildings and infrastructure are being damaged). Our mapping means that site-specific geotechnical assessments to determine liquefaction susceptibility generally only need to be done in areas where liquefaction is considered possible, rather than requiring assessments for every property. For those who need to visit our offices, restrictions will be in place, including physical distancing, all visitors required to sign in and out, and encouraging visitors to register using the COVID-19 tracing app. Christchurch Liquefaction Study - Stage II ECan Report No. According to the U.S. Energy Information Administration’s (EIA) February 2021 Short-Term Energy Outlook (STEO), EIA forecasts that U.S. liquefied natural gas (LNG) exports will exceed natural gas exports by pipeline in the first and fourth quarters of 2021 and on an annual basis in 2022. None of the reports or maps give the likelihood of liquefaction for a particular site or land parcel. Collection . In Timaru township, including the three areas of moderate liquefaction potential and three zones of low potential, the zones are digitised directly from the 1:25,000 Timaru township liquefaction potential map (Figure 2) in the above report, and also from Borelog Location sheets 3 (1:4,000), 4 (1:5,000) and 6 (1:10,000) from Appendix E of the above report. Newsletter. Pressure builds up until the grains float and water is forced up to the surface through the easiest path it can find, often through cracks in the ground or concrete. Open Data. COVID-19: Alert Level 2 - Environment Canterbury offices are open . See Collection Overview for background and usage information. The ground surface above liquefied soil often tilts and sinks, damaging buildings, roads, pipes and tanks. Council Services. Lighter purple shading represents a lower likelihood of damage, while darker purple shading represents a higher likelihood of more severe damage. Not all earthquake faults are created equal – some move more often. This can result in damage to buildings and infrastructure (both above and below ground), the sideways movement of land towards unsupported edges like riverbanks, and silty water being ejected onto the ground surface. Liquefaction. The ground's surface can crack when the soil underneath it moves. Time history and the wavelet map (the percentage of energy content) for the Christchurch, New Zealand (2012) Event, CBGS recorder with observed liquefaction. This is called lateral spreading. The shaking rearranges sand and silt grains in wet soil underground and the water between the grains is squeezed. To liquefy, the soil must be loose, sandy or silty (clay and gravel tend not to liquefy) and wet (below the water table). Liquefaction is the process where some soils behave more like a liquid than a solid during strong earthquake shaking. Identifier. Click here to read our most commonly asked questions. Most areas in Canterbury, outside urban Christchurch City, have very low to no liquefaction susceptibility and, in general, a site-specific geotechnical investigation is not required before building. Inv. Liquefaction mapping from aerial and satellite photos and site visit data following the Christchurch Earthquake on 22 February 2011, also incorporating data from external review comments. COVID-19: Alert Level 2 - Environment Canterbury offices are open, At Alert Level 2, our Tuam Street and Timaru offices will be open to the public as normal, Monday-Friday, 8am-5pm (Christchurch) and 8.30am-5.00pm (Timaru). Search for documents or publications available to download from the Environment Canterbury document library. Find local businesses, view maps and get driving directions in Google Maps. Liquefaction is the process which causes soil to behave more like a liquid than a solid during an earthquake. Areas of San Francisco at risk of liquefaction during an earthquake. The shaking rearranges sand and silt grains in wet soil underground and the water between the grains is squeezed. What's New? This will more accurately assess how susceptible the soil is to liquefaction and what can be done to minimise damage from liquefaction - for example, building stronger foundations. potential to be confirmed by an engineer with shallow investigation data. We map earthquake faults and where land is susceptible to liquefaction. View In: ArcGIS JavaScript ArcGIS Online Map Viewer ArcGIS Earth ArcMap ArcGIS Pro View Footprint In: ArcGIS Online Map Viewer Service Description: Map Name: ChangeinZ_Liquefaction Legend All Layers and Tables Dynamic Legend Dynamic All Layers Layers: Liquefaction Induced Change in Ground Level (0) Liquefaction susceptibility has been mapped in most areas of Canterbury to show whether liquefaction is possible, or unlikely, during strong earthquake shaking. Name: Eastern Canterbury liquefaction susceptibility (2012) Display Field: SOURCECODE Type: Feature Layer Geometry Type: esriGeometryPolygon Description: This dataset outlines liquefaction zones as defined in Figure 2.1 of Brackley (comp), 2012, Review of liquefaction hazard information in eastern Canterbury, including Christchurch City and parts of Selwyn, Waimakariri and Hurunui Districts. 4:40pm 5th November 2017 . However, we prefer – where possible – that you contact us on 0800 324 636 (8am-5pm) or via our contact us page. Locate your District Homepage . Liq. Liquefaction can cause significant damage to land, buildings and infrastructure, through sediment being ejected to the ground surface, and subsequent ground settlement, ground cracking and lateral spreading. Environment. Type. For information about visiting the Bus Interchange, or any public transport queries, go to metroinfo.co.nz, Complying with the Resource Management Act. The only way to determine the actual liquefaction susceptibility at a particular site is to undertake a geotechnical assessment involving testing of the soil on that site. Mike Moffitt, SFGATE. For information about visiting the Bus Interchange, or any public transport queries, go to metroinfo.co.nz. Also enclosed is eleven copies (one unbound and ten bound) of our report titled “Liquefaction Borehole Database – User Guide”. You can find maps on our, Complying with the Resource Management Act, Christchurch City Council's liquefaction information viewer. Assessment of liquefaction susceptibility of Adapazari City after 17th August, 1999 Marmara earthquake November 2009 Scientific research and essays 4(10):1012-1023 Traced from a PDF file; please let me know about any errors. What do liquefaction susceptibility maps mean? Map viewer; 3D viewer (beta) Help; About; Home; News; Explore; Open data; Map viewer; 3D viewer (beta) Help; About; Find out all about a property and the surrounding areas. Name: Waimakariri liquefaction susceptibility (2009) Display Field: Descrip Type: Feature Layer Geometry Type: esriGeometryPolygon Description: The datasetshows zones of different liquefaction susceptibility within Waimakariri district.The dataset is based on the 1:250,000 liquefaction potential maps (Figure7.1) in Yetton & McCahon(2009) Earthquake Hazard Assessment for Waimakariri District. The McCahon (2011)report also used the surface geology from the GNS Science QMAP series, with limited borehole information, to delineate areas of liquefaction potential, but the maps in the report were not developed in GIS and are not adequately georeferenced. Liquefaction damage. The reports and maps outline broad zones where liquefaction is more or less likely due to the general nature of the soils and water table in the area. At Alert Level 2, our Tuam Street and Timaru offices will be open to the public as normal, Monday-Friday, 8am-5pm (Christchurch) and 8.30am-5.00pm (Timaru).