Tag Archive | Auckland

New study reveals the highest volcanic risk areas in Auckland, New Zealand

A new study has mapped which parts of Auckland are most at-risk from volcanic eruptions. Areas in red the most at-risk, and areas in green are the safest.
A new study has mapped which parts of Auckland are most at-risk from volcanic eruptions. Areas in red the most at-risk, and areas in green are the safest
A new study has found Three Kings and Mangere are the most susceptible suburbs in Auckland to a volcanic eruption.
 
Gábor Kereszturi, a PhD student from Massey University, used a Geographic Information Systems (GIS) mapping technique to give areas a susceptibility score in the event of an eruption.
 
His scoring system showed Three Kings and Māngere have a higher chance of explosive volcanic activity than other parts of Auckland, like the elevated North Shore. Other areas of  moderate risk included Favona and Otahuhu, and the safest areas were Glenfield and Chatswood.
 
Kereszturi’s study focused on a particular type of eruption called phreatomagmatic, where magma and water mix underground to cause a violent explosion.
 
His GIS mapping technique combined multiple layers of information onto a map.
 
Kereszturi started by creating a detailed map of Auckland’s topography, which was combined with a geological map and field mapping that allowed him to estimate how past volcanoes erupted.
 
He could then how predict how lava might flow in the present day.
 
His final layer of information was environmental factors like thickness of underlying rocks and sediments in Auckland, sea water level and distance from fault lines.
 
He said the GIS approach was extremely powerful.
 
“Forecasting where the next eruption is going to occur is challenging. But by creating a model based on many different types of information we have readily available, it allows us to predict how a potential future volcano in Auckland might erupt and how big an area it would impact,” he said.
 
He said the next step was to add urban elements like buildings and infrastructure to the model.
Courtesy of stuff.co.nz

Cyclone Pam reaches New Zealand

Cyclone Alert

New Zealand is braced for a stormy night at its northern and eastern extremities as Cyclone Pam passes by with reduced fury.
 
Powerco, New Zealand’s second-largest power company, has fixed some outages on the Coromandel peninsula and schools are already saying they won’t be open tomorrow.
 
The official death toll stands at six people, although the United Nations says there are unconfirmed reports of 44 people killed in just one Vanuatu province.
 
Dozens of people are feared dead after Cyclone Pam slammed into Vanuatu on Friday and a state of emergency has been declared.
 
In New Zealand, the fire service has moved crews to coastal areas expected to be affected by the now category four storm and at 8pm today they had nothing to report.
 
Southeast winds have built off the east coast of Northland and Auckland, MetService said.
 
Winds in Hauraki Gulf are gusting 110km/h and in Kaeo they’re nudging 117km/h.
 
The north-east coast of Auckland and the Great Barrier Island will be hit by severe weather this evening, Auckland Council civil defence controller Clive Manley says.
 
“Areas north of Whangaparaoa and Great Barrier have a good chance of river and stream flooding, strong winds, large swells, waves and coastal erosion,” he said.
 
An Eagles concert in Auckland today is being held early at 6pm and organisers of other events shut them down early.
 
Horses already in Napier for next week’s Horse of the Year Show are being moved to safety and competitors are being urged to delay travel to the nation’s largest equestrian event.
 
Some people are self-evacuating in the Gisborne area, media report.
 
Weatherwatch.co.nz says the eye of the storm is going to track far enough east to avoid causing major damage to Auckland, New Zealand’s largest city.
 
“The main concern is still for East Cape, eastern Bay of Plenty, Gisborne and northern Hawke’s Bay which likely to be walloped by potentially destructive winds on Monday,” the forecaster said.
 
“The advice that I have is that this is not of the strength that has hit Vanuatu,” Civil Defence Minister Nikki Kaye told Q+A today.
 
“But it’s going to be a severe storm and people need to be prepared for that,” she said.
 
Cyclone Pam is expected to be 420km north of East Cape at about midnight.
 
“A high sea warning with hurricane force wind is in force with this system, which also brings torrential rain, unusually heavy swells and very large waves,” MetService said.
Courtesy of 3 News

Cyclone strength winds up to 190kmh strikes New Zealand

storm 11/6
Cyclone-strength winds and heavy rain have caused chaos in Auckland, Northland, Waikato and the Coromandel Peninsula

Emergency services were kept busy as winds gusting up to 190kmh brought down trees, cut power and damaged properties.

Tens of thousands of homes were still without power this morning across Auckland and the Coromandel, and several schools were forced to close.

Across Vector’s northern network there were still 55,000 households without power this morning.

At the height of the storm there were 70,000 customers cut off. So far 15,000 homes have had power restored.

CYCLONE INTENSITY

At the Auckland Harbour Bridge, which was forced closed, wind gusts reached 130kmh and at the Tiritiri Lighthouse in the Hauraki Gulf, up to 170kmh.

On the Whangaparaoa peninsula the average wind speed was 104kmh and in Coromandel winds hit 190kmh.

“I have some pretty high figures and I think it was one of the windiest nights,” MetService meteorologist John Law said.

“Cyclone category one or two would have an average wind speed of 89kmh to 117kmh. So that puts you into that category but that is not a direct comparison,” Law said.

Auckland had 60 millimetres to 70mm of rain in 24 hours.

The storm was this morning moving south.

TREES, POWER LINES DOWN

The power outages were caused by three severe wind periods throughout the night blowing sodden vegetation on to lines or bringing trees down across lines, the last of those being about 3am this morning, Vector said.

Crews were assessing damage caused to lines reportedly by letterboxes, trampolines and garden furniture being blown into them.

At least one person was injured by a falling tree, a child hit when a tree crashed through the roof of a house in Manly, on the Whangaparaoa Peninsula north of Auckland. The child was taken to hospital with minor injuries.

Auckland Transport said traffic on the city’s roads was generally flowing well but there was still debris about. It said some traffic lights may be out, particularly north of the harbour bridge.

The winds tipped over a truck on the Harbour Bridge about 3am, blocking two lanes. It was cleared about 5am and the bridge fully reopened.

A boat was also blown off its moorings and into the bridge, with its mast against the railing.

Many of the navy’s sailors got unscheduled leave after the storm blacked-out its main base in Auckland.

Lieutenant Commander Victoria Rendall said hundreds of non-essential staff were sent home from the Devonport Naval Base.

WIDESPREAD WEATHER HAVOC

As the storm headed south, there were still severe weather warnings with more rain expected in the Bay of Plenty, as well as parts of the Coromandel, Gisborne and Hawke’s Bay.

“But the good news is things are slowly going to improve as we head in towards the weekend,” Law said.

A commercial fishing boat with three people on board was in difficulty about 200 metres off the western Coromandel coast.

Police said the vessel had ropes wrapped around its propeller which was preventing it from making its own way. Its anchor was holding it in place in about 3m of water, off Amodeo Bay.

Emergency services were called to free a person trapped under a damaged house at Wharekaho, near Whitianga overnight.

Police closed Blacksmith Lane in Whitianga due to flying roof iron as firefighters worked to secure the roofs. State Highway 25 south of Whitianga, and the roads near Tairua and south of Thames were flooded.

Hamilton police city shift manager Sergeant Dave Raffan said a truck and trailer unit had rolled by the railway crossing on SH27 at Tatuanui about 5.30am.

There was flooding across parts of Hamilton and drivers were advised to take caution, he said.

MetService forecast persistent rain for Gisborne and Hawke’s Bay from tonight to Friday morning, with up to 250mm of rain possible in the ranges and 150mm in other areas.

In the Rangitikei district up to 200mm of rain could fall today and tomorrow.

In Wairarapa and eastern Wellington, up to 160mm is possible could fall overnight tonight.