Английская Википедия:2016 Kaikōura earthquake

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Шаблон:Short description Шаблон:Use dmy dates Шаблон:EngvarB Шаблон:Infobox earthquake

Файл:Map of 2016 Kaikoura earthquake.svg
Map of Kaikōura earthquakes
Файл:2016 Kaikoura Earthquake ShakeMap.jpg
USGS ShakeMap for the event

The 2016 Kaikōura earthquake was a magnitude 7.8 (Mw) 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).[1] Ruptures occurred on multiple faults and the earthquake has been described as the "most complex earthquake ever studied".[2] It has been subsequently modelled as having a megathrust component set off by an adjacent rupture on the Humps Fault.[3] It was also the second largest earthquake since European settlement.[4]

The earthquake started at about Шаблон:Convert north-east of Culverden and Шаблон:Convert south-west of the tourist town of Kaikōura and at a depth of approximately Шаблон:Convert.[5][6][7] The complex sequence of ruptures lasted for about two minutes.[8] The cumulative magnitude of the ruptures was 7.8, with the largest amount of that energy released far to the north of the epicentre.[9]

Over $2.2 billion in insurance claims were received.[10] There were two deaths, in Kaikōura and Mount Lyford.[11][12]

Earthquake

Файл:PIA21210 - Satellite Radar Show Complex Set of Faults Moved in 2016 New Zealand Earthquake.jpg
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.[8] The hypocentre (the point where the ruptures started) was at a depth of Шаблон:Convert. The epicentre (the point on the Earth's surface above the hypocentre) was Шаблон:Convert north-east of Culverden and Шаблон:Convert from Christchurch.[5][12][13] From the hypocentre associated with the Humps Fault,[14][15] ruptures ripped northwards at a speed of 2 km per second, over a distance of up to Шаблон:Convert. The largest amount of energy released did not occur at the epicentre, rather Шаблон:Convert to the north near Seddon.[16] Initial field surveys indicated ruptures on at least six faults,[16][17] while more detailed studies confirmed ruptures on twenty-five faults.[18] This is considered a world record for the greatest number of faults to rupture in a single earthquake event.[19][20] The earthquake was assessed as the 'most complex earthquake ever studied' and prompted the reassessment of a number of assumptions about earthquake processes.[2]

There was motion on the Kekerengu Fault of up to Шаблон:Convert ± Шаблон:Convert.,[21] movement on the linkage Hundalee Fault of up to Шаблон:Convert vertically and horizontally Шаблон:Convert,[22] a newly identified fault in Waipapa Bay, as well as minor motion on the Seaward segment of the Hope Fault,[23] and rupture on the Humps Fault and in the Emu Plains area.[17] 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 Шаблон:Convert, consisting of Шаблон:Convert on land and Шаблон:Convert under the sea.[24]

Cape Campbell, at the north-eastern tip of the South Island, moved to the north-northeast by more than two metres – putting it that much closer to the North Island – and rose almost one metre. Kaikōura moved to the northeast 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.[16]

Tsunami

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 Шаблон:Convert inland from the high tide mark on the day of the survey.[25]

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.[25]

A tsunami estimated at five metres high struck the north-facing Little Pigeon Bay on Banks Peninsula.[26] The bay contained only one building, an unoccupied holiday house that was pushed off its foundations and heavily damaged.[27] In neighbouring Pigeon Bay, the tsunami was observed at about 2 am but caused no damage.[26]

Casualties and damage

Kaikōura and North Canterbury

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.[28] 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.[29]

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 Шаблон:NZlSH 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 remained closed.[30] The closure of SH1, the Inland Kaikōura Road and the Main North Line railway effectively cut off all land routes into Kaikōura.[31][32]

As of 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.[33] 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.[34] Parts of the diversion route via State Highways 63, 6, 65 and 7 were experiencing four times their usual traffic volume.[35]

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.[36]

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.[37] It reopened unrestricted to all traffic on 19 December 2016.

State Highway 1 south of Kaikōura reopened two days later on 21 December 2016, albeit only during daylight hours.[38] Repair of the highway north of Kaikōura took substantially longer, with the repaired highway opening over a year later on 15 December 2017.[39] The long term closure of State Highway 1 north of Kaikōura (between Mangamaunu and Clarence)[40] 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.[41]

The section of the Main North Line rail link from Picton south to Lake Grassmere reopened on 16 January 2017.[42] The complete railway from Picton to Christchurch was not restored until 15 September 2017,Шаблон:Sfn though service was limited thereafter by continued landslides and repair work; passenger service did not resume until 1 December 2018.[43][44][45]

Ecological disturbance

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.[46][47][48][49] The loss of Durvillaea kelp caused ecological disturbance, significantly affecting the biodiversity of the local intertidal community.[47][48] 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.[50]

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.[51]

Wellington

In the city of Wellington, buildings were damaged, several beyond repair.[52][11] Damage to docks briefly halted ferry traffic across Cook Strait;[11] more significantly, container shipping did not resume for over ten months.[53] The Wellington City Council was given special powers to require reports from building owners,[54][55] and there were doubts about application of the rules.[56] Several buildings were closed temporarily because of doubts about stairwells.[57][58] In Lower Hutt, a cinema complex and part of the carpark in the Queensgate Shopping Centre were deemed unsafe and were demolished.[59] 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;[60] the ramp was rebuilt and reopened in October 2018.[61]

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.[62][63] 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.[64] 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.[65][66] As of March 2023 it is still standing but closed.

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 other North Island claims.[67]

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,[68] the eleven year old, seven-storey NZDF headquarters,[69][70] and Statistics House owned by CentrePort and built in 2005 on the waterfront.[71][72] Several buildings failed because of unsatisfactory design features or collapse of building services in buildings constructed only in the previous decade.[73][74][75][76][77]

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.[78] This building was opened in 2009 and demolished during 2019.[79] 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.[80][81] The building had previously suffered damage during the 2013 Seddon earthquake.[82]

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. As of March 2023, the building has been gutted and strengthened and is expected to reopen in 2026.

Christchurch

Several houses in the coastal suburb of New Brighton in Christchurch were looted after the occupants left because of tsunami risk.[83][84]

Regional effects

Schools and universities across the region were told to remain closed until the situation could be assessed,[85][86] affecting the end-of-year NCEA examinations for secondary school students.[87] 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

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.[88]

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 Шаблон:HMNZS and off-shore patrol vessel Шаблон:HMNZS were deployed to Kaikōura to provide aid supplies and evacuate people.[89] Шаблон:HMCS, Шаблон:HMAS and Шаблон:USS, in New Zealand waters for the RNZN's 75th birthday celebrations in Auckland, were redirected by their respective governments to assist.[90] 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,[91] were deployed to assist.[92] The New Zealand Defence Force also deployed Шаблон:HMNZS[93] and Шаблон:HMNZS[94] to support the operation.

The New Zealand Fire Service dispatched urban search and rescue teams to Wellington and Kaikōura. Paramedics were also dispatched from St John.[85]

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.[95] Stranded tourists with health issues and travel plans were put on a flight priority list.[96] 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.[97]

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.[36]

Changes to building code

The failure of BNZ Harbour Quays, Statistics House and other Wellington buildings that were damaged in the 2016 Kaikōura 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".[98] 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.[99][100] 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[101] and contributed to a shortage of commercial rental properties in Wellington, as renters demand seismically safe buildings.[102]

Aftershocks

Subsequent analysis

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 sunduction margin, ruptured in a classic fashion for about Шаблон:Convert of this fault equivalent to about a Шаблон:M event.[3] 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.[3] 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.[3] 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 happenned in this second phase.[3] The third phase involved classic propagation via northeast shallow crustal strike-slip faulting in the north east Kekerengu and Needles faults.[3]

Gallery

See also

Шаблон:Portal

References

Шаблон:Reflist

Further reading

External links

Шаблон:Earthquakes in 2016 Шаблон:Earthquakes in New Zealand Шаблон:Christchurch earthquakes Шаблон:Portal bar Шаблон:Authority control

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  1. ↑ Шаблон:Cite web
  2. ↑ 2,0 2,1 Шаблон:Cite news
  3. ↑ 3,0 3,1 3,2 3,3 3,4 3,5 Шаблон:Cite journal
  4. ↑ Шаблон:Cite web
  5. ↑ 5,0 5,1 Шаблон:Cite web
  6. ↑ Шаблон:Cite web
  7. ↑ Шаблон:Cite news
  8. ↑ 8,0 8,1 Шаблон:Cite web
  9. ↑ Шаблон:Cite web
  10. ↑ Шаблон:Cite web
  11. ↑ 11,0 11,1 11,2 Ошибка цитирования Неверный тег <ref>; для сносок casualties не указан текст
  12. ↑ 12,0 12,1 Шаблон:Cite news
  13. ↑ Шаблон:Cite web
  14. ↑ Шаблон:Cite journal
  15. ↑ Шаблон:Cite journal
  16. ↑ 16,0 16,1 16,2 Шаблон:Cite news
  17. ↑ 17,0 17,1 Шаблон:Cite web
  18. ↑ Шаблон:Cite web
  19. ↑ Daly, Michael (15 March 2017) Kaikoura earthquake ruptured 21 faults - that's possibly a world record, Stuff.co.nz, Retrieved 15 April 2018
  20. ↑ "M 7.8 Kaikōura Mon, Nov 14 2016", www.geonet.org.nz, Retrieved 15 April 2018
  21. ↑ Шаблон:Cite journal
  22. ↑ Шаблон:Cite journal
  23. ↑ Шаблон:Cite web
  24. ↑ Шаблон:Cite web
  25. ↑ 25,0 25,1 Шаблон:Cite news
  26. ↑ 26,0 26,1 Шаблон:Cite news
  27. ↑ Шаблон:Cite web
  28. ↑ Шаблон:Cite news
  29. ↑ Шаблон:Cite news
  30. ↑ Шаблон:Cite web
  31. ↑ Шаблон:Cite web
  32. ↑ Шаблон:Cite news
  33. ↑ Шаблон:Cite news
  34. ↑ Шаблон:Cite web
  35. ↑ Шаблон:Cite web
  36. ↑ 36,0 36,1 Шаблон:Cite news
  37. ↑ Шаблон:Cite news
  38. ↑ Шаблон:Cite news
  39. ↑ Шаблон:Cite web
  40. ↑ Шаблон:Cite web
  41. ↑ Шаблон:Cite web
  42. ↑ Шаблон:Cite web
  43. ↑ Шаблон:Cite news
  44. ↑ Шаблон:Cite web
  45. ↑ Шаблон:Cite news
  46. ↑ Шаблон:Cite thesis
  47. ↑ 47,0 47,1 Шаблон:Cite journal
  48. ↑ 48,0 48,1 Шаблон:Cite web
  49. ↑ Шаблон:Cite journal
  50. ↑ Шаблон:Cite journal
  51. ↑ Шаблон:Cite news
  52. ↑ Шаблон:Cite web
  53. ↑ Шаблон:Cite web
  54. ↑ Шаблон:Cite web
  55. ↑ Шаблон:Cite web
  56. ↑ Шаблон:Cite web
  57. ↑ Шаблон:Cite web
  58. ↑ Шаблон:Cite web
  59. ↑ Шаблон:Cite news
  60. ↑ Шаблон:Cite web
  61. ↑ Шаблон:Cite web
  62. ↑ Шаблон:Cite web
  63. ↑ Шаблон:Cite web
  64. ↑ Шаблон:Cite web
  65. ↑ Шаблон:Cite web
  66. ↑ Шаблон:Cite web
  67. ↑ Шаблон:Cite web
  68. ↑ Шаблон:Cite web
  69. ↑ Шаблон:Cite news
  70. ↑ Шаблон:Cite web
  71. ↑ Шаблон:Cite web
  72. ↑ Шаблон:Cite web
  73. ↑ Шаблон:Cite web
  74. ↑ Шаблон:Cite web
  75. ↑ Шаблон:Cite web
  76. ↑ Шаблон:Cite web
  77. ↑ Шаблон:Cite web
  78. ↑ Шаблон:Cite web
  79. ↑ Шаблон:Cite web
  80. ↑ Шаблон:Cite web
  81. ↑ Шаблон:Cite web
  82. ↑ Шаблон:Cite web
  83. ↑ Шаблон:Cite news
  84. ↑ Шаблон:Cite web
  85. ↑ 85,0 85,1 Шаблон:Cite web
  86. ↑ Шаблон:Cite web
  87. ↑ Шаблон:Cite news
  88. ↑ Шаблон:Cite news
  89. ↑ Шаблон:Cite news
  90. ↑ Шаблон:Cite news
  91. ↑ Шаблон:Cite web
  92. ↑ Шаблон:Cite news
  93. ↑ Шаблон:Cite news
  94. ↑ Шаблон:Cite news
  95. ↑ Шаблон:Cite web
  96. ↑ Шаблон:Cite news
  97. ↑ Шаблон:Cite web
  98. ↑ Шаблон:Cite web
  99. ↑ Шаблон:Cite web
  100. ↑ Шаблон:Cite web
  101. ↑ Шаблон:Cite web
  102. ↑ Шаблон:Cite web
  103. ↑ Шаблон:Cite web
  104. ↑ Шаблон:Cite web
  105. ↑ Шаблон:Cite web
  106. ↑ Шаблон:Cite web
  107. ↑ Шаблон:Cite web
  108. ↑ Шаблон:Cite web
  109. ↑ Шаблон:Cite web
  110. ↑ Шаблон:Cite web
  111. ↑ Шаблон:Cite web
  112. ↑ Шаблон:Cite web
  113. ↑ Шаблон:Cite web
  114. ↑ Шаблон:Cite web
  115. ↑ Шаблон:Cite web
  116. ↑ Шаблон:Cite web
  117. ↑ Шаблон:Cite web
  118. ↑ Шаблон:Cite web
  119. ↑ Шаблон:Cite web
  120. ↑ Шаблон:Cite web
  121. ↑ Шаблон:Cite web
  122. ↑ Шаблон:Cite web
  123. ↑ Шаблон:Cite web
  124. ↑ Шаблон:Cite web
  125. ↑ Шаблон:Cite web
  126. ↑ Шаблон:Cite web
  127. ↑ Шаблон:Cite web
  128. ↑ Шаблон:Cite web
  129. ↑ Шаблон:Cite web
  130. ↑ Шаблон:Cite news
  131. ↑ Шаблон:Cite web
  132. ↑ Шаблон:Cite web
  133. ↑ Шаблон:Cite web
  134. ↑ Шаблон:Cite web
  135. ↑ Шаблон:Cite web
  136. ↑ Шаблон:Cite web
  137. ↑ Шаблон:Cite web
  138. ↑ Шаблон:Cite web
  139. ↑ Шаблон:Cite web
  140. ↑ Шаблон:Cite web
  141. ↑ Шаблон:Cite web
  142. ↑ Шаблон:Cite web
  143. ↑ Шаблон:Cite web
  144. ↑ Шаблон:Cite web
  145. ↑ Шаблон:Cite web
  146. ↑ Шаблон:Cite web
  147. ↑ Шаблон:Cite web
  148. ↑ Шаблон:Cite web
  149. ↑ Шаблон:Cite web
  150. ↑ Шаблон:Cite web
  151. ↑ Шаблон:Cite web
  152. ↑ Шаблон:Cite web
  153. ↑ Шаблон:Cite web
  154. ↑ Шаблон:Cite web
  155. ↑ Шаблон:Cite web
  156. ↑ Шаблон:Cite web
  157. ↑ Шаблон:Cite web
  158. ↑ Шаблон:Cite web
  159. ↑ Шаблон:Cite web
  160. ↑ Шаблон:Cite web
  161. ↑ Шаблон:Cite web
  162. ↑ Шаблон:Cite web
  163. ↑ Шаблон:Cite web
  164. ↑ Шаблон:Cite web
  165. ↑ Шаблон:Cite web
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