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2016 Kaikōura earthquake

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The 2016 Kaikōura earthquake was a Mw 7.8 earthquake in the South Island of New Zealand that occurred two minutes after midnight on 14 November 2016 NZDT (11:02 on 13 November UTC).[2] Ruptures occurred on multiple faults and the earthquake has been described as the "most complex earthquake ever studied".[8] It has been subsequently modelled as having a megathrust component set off by an adjacent rupture on the Humps Fault.[9] It was the second largest earthquake in New Zealand since European settlement.[10]

2016 Kaikōura earthquake
Demolition of a building on Molesworth Street, Wellington
2016 Kaikōura earthquake is located in New Zealand
2016 Kaikōura earthquake
UTC time2016-11-13 11:02:56
ISC event615035032
USGS-ANSSComCat
Local date14 November 2016 (2016-11-14)
Local time00:02:56 NZDT
Duration~ 2 minutes[1]
Magnitude7.8 Mw[2][3]
Depth15.1 km (9.4 mi)
Epicentre42°44′13″S 173°03′14″E / 42.737°S 173.054°E / -42.737; 173.054
15 km (9.3 mi) north-east of Culverden
TypeOblique-slip
Areas affectedNew Zealand
Max. intensityMMI IX (Violent)[2]
Peak acceleration3.23 g[4]
Tsunami7 m (23 ft)
LandslidesYes
Aftershocks> 20,200[5] (as of 22 November 2017)
Casualties2 dead[6]
57 injured[7]
Map of Kaikōura earthquakes
USGS ShakeMap for the event

The earthquake started at about 15 kilometres (9 mi) north-east of Culverden and 60 kilometres (37 mi) south-west of the tourist town of Kaikōura and at a depth of approximately 15 kilometres (9.3 miles).[3][11][12] The complex sequence of ruptures lasted about two minutes.[1] The cumulative magnitude of the ruptures was 7.8, with the largest amount of that energy released far to the north of the epicentre.[13]

Over $2.2 billion in insurance claims were received.[14] There were two deaths, in Kaikōura and Mount Lyford.[6][15]

Earthquake

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Satellite radar image showing ground motion effects during the earthquake

A complex sequence of ruptures with a combined magnitude of 7.8 started at 00:02:56 NZDT on 14 November 2016 and lasted approximately two minutes.[1] The hypocentre (the point where the ruptures started) was at a depth of 15 kilometres (9.3 miles). The epicentre (the point on the Earth's surface above the hypocentre) was 15 kilometres (9 mi) north-east of Culverden and 95 km (59 mi) from Christchurch.[3][15][16] From the hypocentre associated with the Humps Fault,[17][18] ruptures ripped northwards at a speed of 2 km/s (1.2 mi/s), over a distance of up to 200 km (120 mi). The largest amount of energy released did not occur at the epicentre, rather 100 km (62 mi) to the north near Seddon.[19] Initial field surveys indicated ruptures on at least six faults,[19][20] while more detailed studies confirmed ruptures on twenty-five faults.[21] This is considered a world record for the greatest number of faults to rupture in a single earthquake event.[22][23] The earthquake was assessed as the 'most complex earthquake ever studied' and prompted the reassessment of a number of assumptions about earthquake processes.[8] For example, the likely contribution of underground overpressured fluid to the propagation observed, required data collection and reanalysis with new earthquake models, not available to initial researchers.[24]

There was motion on the Kekerengu Fault of up to 12.0 m (39.4 ft) ± 0.7 m (2 ft 4 in),[25] movement on the linkage Hundalee Fault of up to 2.5 m (8.2 ft) vertically and horizontally 3.7 m (12 ft),[26] a newly identified fault in Waipapa Bay, as well as minor motion on the Seaward segment of the Hope Fault,[27] and rupture on the Humps Fault and in the Emu Plains area.[20] The offshore continuation of the Kekerengu Fault to the north east, known as the Needles Fault, ruptured as well. NIWA marine geologist Philip Barnes said the length of the Kekerengu–Needles Fault rupture may extend for about 70 km (43 mi), consisting of 36 km (22 mi) on land and 34 km (21 mi) under the sea.[28]

Cape Campbell, at the north-eastern tip of the South Island, moved to the north-north-east by more than two metres – putting it that much closer to the North Island – and rose almost one metre. Kaikōura moved to the north-east by nearly one metre, and rose seventy centimetres. The east coast of the North Island moved west by up to five centimetres, and the Wellington Region moved two to six centimetres to the north. Christchurch moved two centimetres to the south.[19]

Tsunami

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The tsunami that followed the Kaikōura earthquake reached a peak height of about 7 metres. The tsunami was found to be highest at Goose Bay, with data indicating a maximum run-up height above tide level at the time of the tsunami of 6.9 m ± 0.3 m. At Oaro, the height was 5.3 m ± 0.3 m. Marine and freshwater flora and fauna were later found scattered across the Oaro River flood plain, extending 250 metres (820 ft) inland from the high tide mark on the day of the survey.[29]

Immediately after the earthquake, the tide level at the Kaikōura tide gauge started dropping. Over 25 minutes, it dropped about 2.5 m, a classic warning sign of a tsunami. During the next 15 minutes, the water level rose from its lowest level by about 4 m. That was followed by a series of waves over several hours. The water level at the Kaikōura gauge rose 2.5 m higher than it would have been. This was made up of a 1.5 m rise measured on the gauge, and a rise of about 1 m of the gauge itself, as the seabed and surrounding land rose by that amount. Some other tide gauges that recorded the tsunami were in Wellington Harbour, Castlepoint, Christchurch, and the Chatham Islands.[29]

A tsunami estimated at five metres high struck the north-facing Little Pigeon Bay on Banks Peninsula.[30] The bay contained only one building, an unoccupied holiday house that was pushed off its foundations and heavily damaged.[31] In neighbouring Pigeon Bay, the tsunami was observed at about 2 am but caused no damage.[30]

Casualties and damage

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Kaikōura and North Canterbury

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Two people died in the earthquake. A man was crushed and died when the historic Elms Farm homestead near Kaikōura collapsed. Two other people were rescued from the rubble of the house, including the man's 100-year-old mother.[32] A woman died in a log house that was damaged at Mount Lyford. Early reports said her cause of death was a heart attack, but an autopsy later indicated it was a head injury suffered during the earthquake.[33]

Many major roads were closed in the South Island because of slips and damage to bridges, including State Highway 1 between Picton and Waipara, and State Highway 7 between Waipara and Springs Junction (SH 65 turnoff). Most roads were cleared within 24 hours, but SH 1 between Seddon and Cheviot via Kaikōura and the Inland Kaikōura Road were closed longer.[34] The closure of SH1, the Inland Kaikōura Road and the Main North Line railway effectively cut off all land routes into Kaikōura.[35][36]

On the morning of 19 November, Kaikōura remained cut off by road due to landslides, damaged bridges and infrastructure, road subsidence, and the risk of falling debris.[37] The NZ Transport Agency said that State Highway 1 would take months to repair, while repairs to the rail line, a key freight connection between Wellington and Christchurch, were likely to take more than a year.[38] Parts of the diversion route via State Highways 63, 6, 65 and 7 were carrying four times their usual traffic volume.[39]

Mains water supply was mostly restored to Kaikōura township by 19 November, but supply was in a "fragile state" and conservation was necessary. The sewage system was "severely damaged" and unusable.[40]

On 30 November 2016, the Inland Kaikōura Road, redesignated "Kaikōura Emergency Access Road", was reopened to civilian drivers holding a permit and for restricted times of the day. Twenty-five crews had worked to clear 50 landslips on that highway alone.[41] It reopened unrestricted to all traffic on 19 December 2016.[42]

State Highway 1 south of Kaikōura reopened two days later on 21 December 2016, albeit only during daylight hours.[43] Repair of the highway north of Kaikōura took substantially longer, with the repaired highway opening over a year later on 15 December 2017.[44] The long term closure of State Highway 1 north of Kaikōura (between Mangamaunu and Clarence)[45] resulted in a detour through the Lewis Pass being the only major route from Picton to Christchurch. This highway had to be upgraded significantly due to this increased usage.[46]

The section of the Main North Line rail link from Picton south to Lake Grassmere reopened on 16 January 2017.[47] The complete railway from Picton to Christchurch was not restored until 15 September 2017,[48] though service was limited thereafter by continued landslides and repair work; passenger service did not resume until 1 December 2018.[49][50][51]

In late 2020 the road and rail between Clarence and Oaro was finished being rebuilt and strengthened, which cost $1.25 billion.[52]

Three cows became stranded on an island after the surrounding ground had swept away.[53] They made international news and have been described as celebrities.[54][55] In 2017 the cows' owner published a children's book about them.[56]

Ecological disturbance

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Uplift along the coast at Kaikōura (up to 6 metres) exposed the intertidal zone, which resulted in a large-scale die off of many organisms including Durvillaea bull kelp.[57][58][59][60] The loss of Durvillaea kelp caused ecological disturbance, significantly affecting the biodiversity of the local intertidal community.[58][59][61] Aerial drone imaging two years after the earthquake indicated that Durvillaea abundance remained low on reefs with significant uplift, but it revealed offshore refuge populations less frequently detected by field researchers.[62] Genomic research sampling D. antartica populations before and after the 2016 earthquake indicates that the original populations have managed to survive and are dominating the initial recolonisation process along the newly formed intertidal coastline.[63] However, D. antarctica remains sparse and further change in genetic diversity is possible over the next coming decades.[63]

The Hutton's shearwater (Puffinus huttoni) colony in the Seaward Kaikōura ranges was extensively damaged by the earthquake. Large landslides buried up to 20% of the existing colony areas. Extensive shaking damaged the integrity of many burrows in the remaining shingle and soil tussock-covered habitat used by these alpine nesting seabirds. The birds were at the peak of egg laying in mid-November and with the quake happening at midnight there would have been considerable losses of birds nesting within breeding burrows.[64] The earthquake also buried one of the two boulders remaining inhabited by the eyelash seaweed, with the condition of the other 4 km away being unknown. The species has not been found in the wild since the earthquake, and it may now be extinct.[65]

Wellington

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In the city of Wellington, buildings were damaged, several beyond repair.[6] Damage to docks briefly halted ferry traffic across Cook Strait;[6] more significantly, container shipping did not resume for over ten months.[66] The Wellington City Council was given special powers to require reports from building owners,[67][68] and there were doubts about application of the rules.[69] Several buildings were closed temporarily because of doubts about stairwells.[70][71] In Lower Hutt, a cinema complex and part of the carpark in the Queensgate Shopping Centre were deemed unsafe and were demolished.[72] At Ava railway station, one of the pedestrian access ramps was damaged and was removed during the weekend of 17 and 18 December, leaving the station without wheelchair access;[73] the ramp was rebuilt and reopened in October 2018.[74]

A 54-year-old nine-storey office block, the former ICI Building at 61 Molesworth Street, was demolished during December 2016 after fears that it could collapse.[75][76] The damaged Reading Cinema parking building off Courtenay Place was demolished during January 2017. Both building failures resulted in part of the adjacent streets (Molesworth Street and Tory Street) being closed off for a period.[77] The Courtenay Central Reading Cinema complex closed due to minor damage, reopened in March 2017 then closed again on 5 January 2019 after further assessment.[78][79] As of July 2024 it is still standing but closed.[80]

By February 2017, business insurance claims had passed NZ$900 million. The Wellington Region had two thirds (65%) of the total losses, followed by the upper South Island at 25%, Canterbury at 8% and the remaining 2% from elsewhere in the North Island.[81]

In 2016 and 2017 it was decided that several other buildings would be demolished, not repaired: the Figaro Block of the Malvina Major Retirement Village in Burma Road, Johnsonville,[82] the eleven year old, seven-storey NZDF headquarters,[83][84] and Statistics House owned by CentrePort and built in 2005 on the waterfront.[85][86] Several buildings failed because of unsatisfactory design features or collapse of building services in buildings constructed only in the previous decade.[87][88][89][90][91]

BNZ Harbour Quays, a large building on Waterloo Quay leased to the BNZ, was badly damaged in the earthquake and in 2018 the building's owner CentrePort announced that it would be demolished.[92] This building was opened in 2009 and demolished during 2019.[93] BNZ then sued the Wellington City Council for negligence for granting building consents and issuing code compliance certificates, since concerns about the building's design had been raised by reviewing engineers before construction began.[94][95] The building had previously suffered damage during the 2013 Seddon earthquake.[96]

Wellington Central Library was not damaged during the Kaikōura earthquake but closed suddenly on 19 March 2019 after engineers reassessed it in light of new understanding about building performance gained from the 2016 quake.[97] As of March 2023, the building has been gutted and strengthened and is expected to reopen in 2026.[98]

Demolition of the Civic Administration Building in Te Ngākau Civic Square started in April 2024.[99]

Christchurch

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Several houses in the coastal suburb of New Brighton in Christchurch were looted after the occupants left because of tsunami risk.[100][101]

Regional effects

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Schools and universities across the region were told to remain closed until the situation could be assessed,[102][103] affecting the end-of-year NCEA examinations for secondary school students.[104] Exams on the day of the earthquake were cancelled in many schools, including all of Wellington. Students received derived grades for any exams due to be taken the week of the earthquake.

Response

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Prime Minister John Key surveyed the damage from the air and later described the scenes as "utter devastation" and estimated that reconstruction would take months and cost billions of dollars.[105]

The New Zealand Defence Force dispatched five Royal New Zealand Air Force helicopters (four NH90s and one Agusta A109), a P-3 Orion and a C-130 Hercules to survey and provide essential emergency supplies to the most severely affected areas around Kaikōura. Kaikoura Aerodrome was too small to take larger multi-engine aircraft so the landing was limited to helicopters and small aircraft. The Royal New Zealand Navy's multi-role vessel HMNZS Canterbury and off-shore patrol vessel HMNZS Wellington were deployed to Kaikōura to provide aid supplies and evacuate people.[106] HMCS Vancouver, HMAS Darwin and USS Sampson, in New Zealand waters for the RNZN's 75th birthday celebrations in Auckland, were redirected by their respective governments to assist.[107] A United States Navy P-3 Orion of VP-47 and two Kawasaki P-1s of the Japan Maritime Self-Defense Force's Air Patrol Squadron 3, also visiting RNZAF Base Whenuapai for the RNZN 75th anniversary events,[108] were deployed to assist.[109] The New Zealand Defence Force also deployed HMNZS Te Kaha[110] and HMNZS Endeavour[111] to support the operation.

The New Zealand Fire Service dispatched urban search and rescue teams to Wellington and Kaikōura. Paramedics were dispatched from St John.[102]

Nearly 200 people had been airlifted out of Kaikōura by late evening on 15 November, with about 1,000 still to be evacuated on the following morning.[112] Stranded tourists with health issues and travel plans were put on a flight priority list.[113] HMNZS Canterbury arrived in Kaikōura on 16 November and transported about 450 evacuees, 4 dogs, and 7 tonnes of luggage to Lyttelton, arriving early the following morning.[114] On the morning of 20 November, HMNZS Canterbury arrived at Lyttelton with another group of evacuees, bringing the total number evacuated from Kaikōura to more than 900.[40]

The earthquake occurred on the same day of a supermoon, which caused some speculation that the Moon caused, or increased the likelihood of, the earthquake. Scientific analysis shows that the Moon does not influence earthquakes.[115][116][117]

Changes to building code

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The failure of BNZ Harbour Quays, Statistics House and other Wellington buildings that were damaged in the earthquake led to revision of seismic assessment guidelines. The Ministry of Business, Industry and Employment (MBIE) released The Seismic Assessment of Existing Buildings, commonly known as the Red Book, in July 2017. These guidelines provide "a technical basis for engineers to carry out seismic assessments of existing buildings".[118] Section C5 deals with assessment of multi-storey concrete buildings. In 2018, section C5 was revised because understanding of building performance in the Kaikōura earthquake had changed. The revised section is known as the Yellow Book or Yellow Chapter. Assessment using the Yellow Book can lead to different results from assessment using the Red Book, but only the Red Book has legal standing.[119][120] Wellington Central Library and Courtenay Central cinema complex were closed in 2019 after assessment under the Yellow Book guidelines. The differences in the two versions of the guidelines have led to confusion and frustration for building owners and engineers[121] and contributed to a shortage of commercial rental properties in Wellington, as renters demand seismically safe buildings.[122]

Aftershocks

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  •  
    Magnitude of Kaikōura earthquakes
  •  
    Number of aftershocks within 200 km of Kaikōura

Subsequent analysis

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As a land earthquake with unexpected complexity, suggesting a multi phase event, backed by hard data, including that now of the aftershock sequence's orientation, and an immediate size of displacement relative to length of surface rupture inconsistent with standard models, a new model for some surface megathrust earthquakes has evolved. Currently it is postulated that an initial dominantly strike-slip event on the Humps Fault within the Pacific plates continental crust, and not associated with the Pacific plate subduction margin, ruptured in a classic fashion for about 40 km (25 mi) of this fault equivalent to about a Mw 7.0 event.[9] This area of the South Island does not have the Pacific plate subducting at the Hikurangi Margin, which commences at Kaikōura to the north east of the Humps Fault. Further a rupture of the Humps Fault, as occurred, is not predicted by any classic modelling to propagate to allow rupture in the faults of the Marlborough Fault System as was observed to happen.[9] About 45 seconds later, in a second phase, a subsurface megathrust earthquake was initiated in the adjacent area and it was this megathrust earthquake that allowed the rupture of multiple surface faults with atypically high displacements. Such coupling is the new model.[9] As most megathrust earthquakes occur off shore there had been no direct evidence before now of such immediate displacements but it has been postulated that both the 1960 Valdivia earthquake and the 1855 Wairarapa earthquake could have been associated with coupling of a shallow subduction megathrust earthquake with surface faults in the overlaying plate as happened in this second phase.[9] The third phase involved classic propagation via northeast shallow crustal strike-slip faulting in the north east Kekerengu and Needles faults.[9]

A peak ground acceleration of 3.23 g was measured in Waiau, which was considered the second highest peak ground acceleration ever in the world. In 2019 it was determined that the measurement at this site was erroneous due to the concrete slab the seismometer was sitting on bouncing, and would have instead been about 1.2 g.[176][177]

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  •  
    The Elms homestead, pictured here in 2012, collapsed during the earthquake, killing one person
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    Morning supply run from USS Sampson helicopter
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    Earthquake uplift at coastal sites resulted in large-scale die offs of intertidal organisms such as Durvillaea kelp
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    Uplift measured in the intertidal zone at Kaikōura
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    Demolition of the damaged cinema and parking building at Queensgate Shopping Centre, Lower Hutt
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    Baggage of evacuees being unloaded off HMNZS Canterbury
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    Uplifted shoreline on the Kaikōura Peninsula in 2020
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    Uplifted shoreline at Ward Beach in 2020

See also

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References

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Further reading

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  • Merrifield, ALR (Rob) (2018). The Kaikoura Job: Rebuilding KiwiRail's Main North Line. Wellington: NZ Railway & Locomotive Society. ISBN 978-0-908573-96-7.
  • Pennington, Phil (2017). Surviving 7.8: New Zealanders respond to the earthquakes of November 2016. Auckland: HarperCollins. ISBN 978-1-7755-4110-3.
edit
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