According to GNS Scienceseismologists, the energy released in Christchurch was equivalent t… Gillian Needham took this iconic photo from her home in Cashmere minutes after the 22 February 2011 earthquake struck Christchurch. In the ten minutes after it hit, there were 10 aftershocks of magnitude 4 or more. On August 23, 2011, a magnitude 5.8 earthquake hit the Piedmont region of the U.S. state of Virginia at 1:51:04 p.m. EDT. Jacinda Ardern said the earthquake and aftershocks affected people in complex and diverse ways. It has been five years since a major earthquake hit the New Zealand city of Christchurch, but thousands of residents are still waiting for their homes to be repaired or rebuilt, writes Michael Ertl. On the 13th June 2011, the biggest aftershock struck Christchurch measuring in at a magnitude 6.4, although this aftershock measured bigger than the the main earthquake on the 22nd February 2011.This aftershock was … Buildings have collapsed around Cathedral Square in downtown Christchurch. Seismologists at the US Geological Survey have recorded at least six earthquakes of magnitude five or more since September's magnitude 7 incident. David Rothery at the Open University's volcano dynamics group, said: "The magnitude 6.3 earthquake was a very large aftershock following the 3 September magnitude 7.0 earthquake. The quake was centred 10km south-east of the city at a depth of 5km. The deadliest earthquake in New Zealand was a 7.8 event that occurred at Hawkes Bay in 1931; leaving 256 dead. A GeoNet image plots the earthquakes in order of most recent to oldest, meaning the least recent events are on top. It was centred 10km south east of the city and hit at 12:51pm. Nearly 1000 buildings in central Christchurch are expected to be demolished due to the quake. A massive aftershock has hit in Christchurch. The map below ( courtesy of Geonet ) shows that these smaller aftershocks – the green circles – do encompass the area containing the fault which ruptured on Tuesday. Dougal Jerram at Durham University said: "Christchurch sits on what is historically a tectonically active area where the Alpine fault runs right across New Zealand's South Island. First, the epicentre of this earthquake was much closer to Christchurch (10km) whereas the September 7.1 magnitude was 40 km west of Christchurch. CHRISTCHURCH, NEW ZEALAND - FEBRUARY 22: A Bus covered in building debris is seen on February 22, 2011 in Christchurch, New Zealand. The earthquake that brought death and destruction to Christchurch on Tuesday was almost certainly an aftershock of a larger quake that rocked New Zealand on 3 September last year. ", Your support powers our independent journalism, Available for everyone, funded by readers. Also many of the buildings had already been weakened by the 2010 earthquake. Because of the building code of New Zealand larger loss of life was limited, although the most severe shaking lasted only 12 seconds which may have prevented more damage. Seismologists believe that the 22 February quake was itself an aftershock of the magnitude 7.1 earthquake centred on Darfield on 4 September 2010. Here is a satellite image of the Earthquake Showing the Intensity, This Car has Fallen into a Sinkhole Caused by Flooding & Liquefaction. As had happened after the 4 September 2010quake, there was a lot of liquefaction. GeoNet says the quake has been registered as a 6.3 and was just five kilometres deep. Following the magnitude 6.3 Lyttelton earthquake on 22 February 2011 there were many aftershocks. This time it was often colleagues, classmates or complete strangers who comforted and help… The earthquake was blamed for breaking a 30m-tonne chunk of ice off the Tasman glacier in Aoraki Mount Cook national park in the centre of the south island. The rupture was also much closer to the city, and this too made it worse. These will be a hazard to people trapped in damaged and weakened buildings and their rescuers.". The June quake was preceded by a magnitude 5.9 M L tremor that … New Zealand has some of the most stringent building regulations, but early reports from government scientists in the country indicate that the levels of shaking in and around Christchurch were greater than buildings are typically built to withstand. First published on Tue 22 Feb 2011 16.17 EST. But while last year's earthquake was more energetic, it struck in the early hours of the morning, some 48km outside the city. Ten years on some people are still living their daily lives with the long shadow of that day, she said. The June 2011 Christchurch earthquake was a shallow magnitude 6.0 M w earthquake that occurred on 13 June 2011 at 14:20 NZST (02:20 UTC).It was centred at a depth of 7 km (4.3 mi), about 5 km (3 mi) south-east of Christchurch, which had previously been devastated by a magnitude 6.2 M W earthquake in February 2011. First Person - I still can't remember why I was there. An aftershock sequence was initiated, which included a catastrophic M w 6.3 earthquake on 22 February 2011 beneath the city of Christchurch, killing 185 people. Read about the GeoNet response to the landslides and rockfalls after the Christchurch earthquake: GNS Science Immediate Report LD8 (NZTopo50-BX24)/941-947 (6.32Mb) Report on Landslide Reconnaissance Flight on 24 February 2011 following the MW 6.3 Christchurch Earthquake of 22 February 2011 GNS Science New Zealand stated that this earthquake was technically an aftershock of the 2010 Christchurch earthquake. There was also surface flooding and soil liquefaction. The February quake produced many aftershocks for an earthquake of its size with about 361 aftershocks within the first week, the largest of all measured 5.9 and occurred just under 2 hours of the initial shock. Other, hopefully smaller, aftershocks are to be expected. The 6.3 magnitude earthquake - an aftershock of the 7.1 magnitude quake on September 4 - struck 20km southeast of Christchurch at around 1pm local time, with initial reports suggesting damage and fatalities far exceeding the initial … The Christchurch earthquake of 2016, for example, was an aftershock of the 2010 quake. On 22 February 2011, at 12:51 pm, Christchurch was struck by a magnitude 6.3 earthquake. But, on Tuesday 22 February 2011, some errand had me and my 10-month-old baby at the Palms Shopping Mall, about 4.5km north-east of the Christchurch CBD. It has treated over 220 serious injuries so far, even though sometimes they were working by torchlight. Tuesday's earthquake was recorded at magnitude 6.3, or roughly 11 times weaker, but it was enough to raze buildings already damaged by the previous earthquake and later aftershocks. New Zealand's GNS Science has stated that the earthquake was part of the aftershock sequence that has been occurring since the September magnitude-7.1 quake, however a seismologist from Geoscience Australia considers it a separate event given its location on a separate fault system. Liquefaction happens when underground water in the soil comes to the s… Christchurch Hospital was evacuated due to damage in some areas, but soon reopened to treat the injured. The islands are shaken by noticeable tremors on average twice every three days. Some damaging aftershocks followed the main event, the strongest of which was a magnitude 6.3 shock known as the Christchurch earthquake that occurred nearly six months later on 22 February 2011. The Christchurch event followed the Darfield quake some five-and-a-half months later but was an unusually strong aftershock; Christchurch was just 0.9 moment magnitude units less than Darfield. Japan had experienced 900 aftershocks after the M9.1 earthquake on March … "This earthquake has also been particularly shallow, so despite measuring slightly less than the previous major earthquake in Christchurch ... more of the earthquake's energy makes it to the surface causing far greater destruction, than if the quake was deeper underground. It was the middle of a working day and many people were at school or work, having lunch or running errands. A series of earthquakes hits the New Zealand city of Christchurch, leaving thousands without power, months after a tremor devastated the city. New Zealand GNS Science called it "Technically an aftershock" but other seismologists consider it a different event because of the 2011 quake occurring on a different series of fault lines. There's a nice map by two GNS scientists showing this here: Why the 2011 Christchurch earthquake is considered an aftershock. Following the large magnitude 6.3 earthquake that occurred on the 22nd February 2011, there were over 361 aftershocks ranging from magnitude 1.1 to magnitude 5.8. Warning: This story contains a first-hand account of the Christchurch 2011 earthquake that may be distressing for some readers. The September quake had occurred in the early hours of the morning with family generally close at hand. On the south island, where Tuesday's earthquake struck, the Pacific and Australasian plates slip past each other horizontally, producing the enormous Alpine fault that runs down the western flank of the island. Christchurch, New Zealand's second-most populous city, was hit by a 6.2 magnitude earthquake at 12.51pm local time (11.51pm on February 21 GMT). The surrounding discussion talks a little about aftershock patterns, but as the title indicates, focusses on explaining why they consider the 22 Feb quake an aftershock. This 6.3 magnitude earthquake is considered an aftershock of the 7.1 magnitude quake that struck the Canterbury region in September 2010. A 6.3 Magnitude earthquake strikes 5km south-east of Christchurch at a depth of 5km. New Zealand itself straddles the boundary between the Pacific and Australasian tectonic plates, which slowly grind into one another. Its focus was at a very shallow depth of about 5km, which doubtless contributed to the severity of the ground shaking that witnesses in Christchurch describe as more severe than in September. The epicenter, in Louisa County, was 38 mi (61 km) northwest of Richmond and 5 mi (8 km) south-southwest of the town of Mineral.It was an intraplate earthquake with a maximum perceived intensity of VII (Very strong) on the Mercalli intensity scale. For every 10 earthquakes on the planet, nine are in this region. New Zealand GNS Science called it "Technically an aftershock" but other seismologists consider it a different event because of the 2011 quake occurring on a different series of fault lines. About 200'000 tonnes of silt lifted by the quake strongly affected the eastern suburbs of Christchurch. The 2011 quake was shallower in only 5 km underground, while the 2010 quake happened 10 km underground. This earthquake … ... Christchurch hit by aftershocks… At magnitude 6.3, the Lyttelton quake was so large that it generated its own series of aftershocks. Even though the quake was a smaller magnitude than the September 2010 quake it was more deadly for a number of reasons. Because this aftershock was centred very close to Christchurch, it was much more destructive and resulted in the deaths of 185 people. Information about Aftershocks related to the 2011 Christchurch Earthquake: 2011 Christchurch earthquake was probably an aftershock of the Christchurch earthquake which occurred on the 4th of September which had a magnitude of 7.1. There have … This is a Map of the Earthquake That Damaged Christchurch and the Surrounding Area. This quake had a strike-slip motion and most of the buildings destroyed were pre-1970s designs like the Christchurch cathedral. The number of businesses in Christchurch is now 16 per cent higher now than pre-quake (from 37,000 to 43,000), while employee numbers are up 18 per cent (from 185,000 to 218,000). The quakes may have occurred on "blind faults", which have been inactive for so long, there are no records of their existence. It struck the Canterbury region of the island and caused a lot of damage and many deaths in Christchurch, New Zealand's second largest city.. Tue 22 Feb 2011 16.17 EST © 2021 Guardian News & Media Limited or its affiliated companies. This is largely due to the earthquake taking place in the early hours of the morning when residents were in bed, and due to the distance of the earthquake from major urban areas. Associated with this are many fault segments. The earthquake that brought death and destruction to Christchurch on Tuesday was almost certainly an aftershock of a larger quake that rocked New Zealand on … The iceberg produced giant waves in the park's terminal lake for half an hour. It shows the city's CBD enveloped in a cloud of dust. It was about 5 km underground. ... What's happening in Christchurch to commemorate the 2011 quake. One of the most resent happened on the morning of June 6th and measured 5.5 magnitudes. All rights reserved. Water pipes, roads, bridges, power lines, cell phone towers and ordinary phone lines were broken or damaged. More aftershocks may yet arrive. This study systematically examined the psychological impact of fatal February 2011 earthquake in residents of Christchurch, New Zealand.Design/Method: Participants completed a door-to-door survey approximately 6 months after earthquake (Time 1, N=600) and again 11 months after the earthquake (Time 2, N=412). What seems to have happened is that the pressure has built up on a particular fault segment with the epicentre much closer to the city itself. New Zealand is in a region of extraordinary geological activity called the Ring of Fire, which stretches from Indonesia to the coast of Chile. 19 Feb 2021. Dr Brian Baptie, Head of Seismology. The February 22 quake is also notable for its long – and continuing - aftershock sequence, mainly due to the strong and dense crust beneath Canterbury. The quake that hit on Tuesday was more devastating for several reasons: it was shallower, much closer to Christchurch and arrived in the middle of local lunchtime at 12.51pm. A number of contributors to QuakeStories who were in the CBD at the time of the earthquake saw the dust cloud and knew that it meant buildings would be down: More than 10,000 quakes have rattled Christchurch since February 22, 2011. The 6.3-magnitude earthquake may have been an aftershock of the 7.1-magnitude 4 September 2010 Canterbury earthquake. The spire of ChristChurch Cathedral has completely collapsed. After 10 years, Christchurch is no longer, first and foremost, an earthquake-damaged city – but progress to this point has been slow and hard-won. 'This Christchurch earthquake is the most recent of an almost continuous series of aftershocks extending east towards Christchurch since the Darfield earthquake in September.' The New Zealand defence forces have been called in to help move people out of the central business district.Fires were reported at the Canterbury Television (CTV… The Earthquake and Aftershocks This 6.3 magnitude earthquake is considered an aftershock of the 7.1 magnitude quake that struck the Canterbury region in September 2010. Last September’s Darfield earthquake was centred 40 km to the west of Christchurch, but the epicentres of the aftershocks in the months that followed gradually migrated east towards the city. Earthquakes are not rare in New Zealand. (This is 23:51 21 February UTC). Objectives: People respond differently to potentially traumatic events. This event was part of the 2010–11 Canterbury Earthquake Sequence, which started with the Mw7.1 Darfield Earthquake on September 4, 2010. Most Cantabrians were away from their homes when the 6.3-magnitude earthquake struck at 12.51 p.m. on 22 February 2011. The 2011 Christchurch earthquake was a 6.3 magnitude earthquake which struck the South Island of New Zealand at 12:51 pm on 22 February 2011 NZT.