"First up is the Hyde Fault which created the Rock and Pillar Range a long time ago, and would greatly affect Dunedin if it ruptured again," he said. New Zealand is divided into four earthquake risk zones for the purpose of determining the bracing requirements of buildings to resist earthquakes. "Chances are that there might be another long period of quiet. Because of the expected widespread disruption and damage, a well-planned and co-ordinated response was considered essential. GNS Science maintains an interactive map of all known active faults in New Zealand. Scientists investigating a 'hit list' of long-quiet but high-risk earthquake danger zones.
Seismic activity in the Canterbury region has been very high since the Darfield earthquake and after nine years it is still higher than it was before the Darfield earthquake struck. If you live near a hill or steep slope, watch out for cracks or movement that could be a warning sign. liquefaction (where liquid, sand and silt rise up from the ground), lateral spread (where liquefied land pulls apart or cracks), unusually warm or cracked hard surfaces, such as paths and driveways.
The North Island Fault System runs in a line from the Bay of Plenty to the Wellington coast and is responsible for creating the Kaweka, Ruahine, Tararua and Rimutaka mountain ranges.
Ask your local council for information about the likelihood of hydrothermal activity in your area. The email address Our map shows where earthquake fault lines are … This article provides an overview of what informs AIR’s understanding of New Zealand’s seismic risk, the model’s enhancements to the shake component, as well as the four new modules included in the update for the following sub-perils: tsunami, landslide, liquefaction, and fire-following. Stirling and his team will dig trenches to find when local faults last ruptured, and how big the events were. On September 4, 2010, an M 7.0 earthquake struck 45 km (28 miles) west of Christchurch; dubbed the Darfield earthquake, it was the first in a more than year-long series of quakes that impacted the Canterbury region.
The country has experienced several tsunamis during the past 150 years, with some of the most significant ones resulting from large, distant earthquakes, such as those offshore Chile and Peru. The set of GMPEs used for each type of earthquake is selected based on detailed analysis of strong motion data from recent earthquakes to determine the goodness of fit for each GMPE relative to ground motion observations. Some councils use blue lines on roads to mark how far a large tsunami may reach. If a disaster happened tomorrow, would you be ready? Structures in high-risk zones must be built to more stringent requirements than structures in low-risk zones. "You need a lot of data going back a long time to answer that kind of question, so all the research we're doing in Otago will contribute to that larger question as well.". However, there are still many other relatively minor faults across the South Island, which rupture less frequently, such as those which have caused the Canterbury and Christchurch earthquakes. Because so much of the City of Christchurch and surrounding suburbs were built on loose sand and silt deposits, there was an unprecedented amount of damage from liquefaction following the February 2011 M6.2 earthquake.
All these cities have experienced severe earthquakes since European settlement. "Data from the research will also feed into the National Seismic Hazard Model which in turn is used to develop the standards for building strength in different parts of the country.". Unable to subscribe at this moment. The 1855 M8.2 Wairarapa earthquake, near the capital city of Wellington, was the strongest ever recorded in New Zealand, and significantly changed the coastline of the southern tip of North Island. Homes can be damaged by falling ash, lahar (mudflows), pyroclastic flows (a flowing mass of hot gas and rock), landslips and fire. These higher risk areas are above or close to where the Australian and Pacific tectonic plates meet, making earthquakes more common.
The latest geotechnical data and innovative methodologies were used in the development of the AIR Earthquake Model for New Zealand to ensure the most robust results possible, which have been extensively validated and peer-reviewed by local experts. (GNS Science). The updated AIR Earthquake Model for New Zealand includes modules for these sub-perils and more. New Zealand has a large number of faults, but they are not all active at the same time. New Zealand Herald . Even small earthquakes can damage a home, depending on the land the building sits on, as well as the building’s design and construction.
The 2010–11 Canterbury earthquakes are outside the areas of greatest statistical risk of high ground shaking.
A major geological hazard frequently triggered by strong ground motion, landslides can cause destruction of buildings, roads, power lines, pipelines, and other exposures, as they did after Kaikoura. The plan would be next reviewed following a national Alpine Fault exercise scheduled for 2020. Buildings with low floor levels are more likely to be flooded in these areas. Earthquakes can bring rapid, violent shaking both sideways and/or up and down, or slower rolling movements. New Zealand has a large number of faults, but they are not all active at the same time.
Liquid is forced to the surface, carrying sand and silt with it; land can slump; surface soil close to sloping ground (such as stream banks) can spread, with cracks opening up. "Dunedin is generally considered low earthquake risk, but in 1974 there was a magnitude 5 earthquake offshore and EQC received 3000 claims from homeowners.".
GNS Science maintains an interactive map of all known active faults in New Zealand. The Marlborough Fault System is a major sequence of faults in the upper South Island. Any repair work that is necessary for example, making good the gaps left in a roof after chimney removal can also be done without a consent. Later, in 2016, the M7.8 Kaikoura earthquake produced seismic waves that traveled as far as Wellington, where soft soil deposits amplified shaking for longer period ground motions, resulting in disproportionately high damage for mid-rise and high-rise buildings.
The impact of sedimentary basins is explicitly captured for the Christchurch area using NGA-West2 GMPEs along with the latest 3D geological model for the Christchurch Basin (Figure 6). See the map below. AIR’s substantial update to the New Zealand earthquake model, scheduled for release this summer (winter in the Southern Hemisphere), incorporates innovative methodologies and the highest quality data available for the most comprehensive view of New Zealand earthquake risk.
But when they do, they can be quite damaging. In the South Island, the Marlborough Fault System is another series of major parallel faults.These join together further south to form the Alpine Fault which carries most of the total plate boundary strain.
The complexity of this earthquake’s rupture is highly unusual, given that the multiple faults involved in the rupture were not interconnected at the surface.
On flat ground where there is a high water table and the soil is low-density sand or silt, liquefaction can take place.
Earthquake hazard zones The Waikato region has many active fault lines that increase the chance of earthquakes.
Do what you can to reduce the risk of damage to your home from earthquakes. Slopes and retaining walls has more information. Special considerations for suspended ceilings. Contact us Every earthquake is different and unpredictable.
Source: NZS 1170.5:2004 (Incorporating Amendment No 1).
The cap on EQC residential building cover is increasing from $100,000 (+GST) to $150,000 (+GST). Making sure that piles are firmly fixed to bearers, Adding timber braces between piles and bearers or joists, or between piles and corner foundations, Adding new plasterboard lining over old sarking on interior walls, Removing or replacing unreinforced masonry chimneys, Making sure clay or concrete tiles are properly fixed, earthquakes, natural landslips, volcanic eruptions, hydrothermal activity or tsunami. AIR has incorporated extensive local liquefaction and site-specific studies, damage surveys and claims data from recent New Zealand earthquakes, as well as lessons learned in the U.S. and Japan, to achieve a comprehensive picture of the country’s liquefaction risk. This exemption is limited to any building up to 3 storeys high as long as the removal does not aﬀect the primary structure, any speciﬁed system or any ﬁre separation (which includes ﬁrewalls protecting other property). While the risk due to tsunami mainly affects the coast, earthquake-triggered landslides pose a high risk across this mountainous country. A number of major fault lines are in a band that runs the length of New Zealand. Many of the larger faults are oblique-slip faults, which can cause a combination of horizontal and vertical movement.
BRANZ conducted a research project funded by the Earthquake Commission around houses with mixed bracing systems. What you’re covered for explains how EQCover works for your home, contents and land. / Earthquakes
The North Island Fault System is a major plate boundary feature in the North Island, under constant stress from movement between the Pacific and Australian plates.
The time limit on lodging a claim has been extended from 3 months to 2 years. More information is available below the map. EQ Cover is provided by a government body, the Earthquake Commission, and is government guaranteed. There are steps you can take around your home to help reduce the risk of damage: Ask your local council whether the land around your home is susceptible to: The Building Research Association of New Zealand (BRANZ) has more technical information about various earthquake hazards on its Seismic Resilience webpage.
where heavy roof and/or wall claddings are specified. Your local council has information you can use to reduce your risk during a natural disaster. Fire-following earthquakes continue to pose a significant risk to cities. For this reason, AIR considered the most recent studies on prehistorical ruptures of crustal faults and paleoseismic records for the Hikurangi subduction zone in New Zealand, as well as the impacts from the 2016 Kaikoura earthquake, and developed a time-dependent view of rupture probabilities on active faults and subduction zones. The level of earthquake shaking that is considered when designing a … Landslips and earthquakes can happen almost anywhere and low-lying areas are at risk of tsunami.
The Hawke’s Bay (Napier) M7.4 earthquake in 1931 was New Zealand's deadliest natural disaster.
Many smaller faults remain undiscovered until they generate an earthquake.
AIR’s tsunami model uniquely simulates the origin, propagation, and runup of tsunamis to capture the risk to New Zealand’s dense coastal and marine exposure(s).
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