Tsunami warning in NZ

[Franziska]

Hi,

just got this on the news:

https://twitter.com/NZcivildefence/s...219420674?s=20

Tsunami warning in NZ.

All be safe & careful. Good luck!!!

[JPA Cate]

There have been 3 quakes, that I am aware of: Centered near the Kermadec Is., which are cited along the Tonga Trench. They were 7.3, 7.4, and 8.0 in magnitude, and the largest one was 10 k. under the sea. The tsunami warning also covers Norfolk Is. and Lord Howe Is., which are part of Australia.

In New Zealand, people have been evacuated to high ground, told this is more urgent even than Covid 19 distancing.

I got this info just by Googling "today's New Zealand earthquake."

No reports of damages as yet. There is a met station at Raoul Is., but their comms could have been taken out.

Ann

On Edit: On our paper charts for Raoul Is, there was a notation that the seabed might raise or lower by 20 meters. It is a well known volcanically active area. Hope the guys at the met station are okay.

[Tillsbury]

Just waiting down here in Lyttelton to see what happens. Surely some forum members are in opua under a relatively significant warning, but guessing they are a little busy slipping lines right now to be posting

[JPA Cate]

@Tillsbury:

If the three quakes are all, for now, that's one thing, but, honestly, a 7.2 followed by an 8, is a huge change: it represents quite vigorous change, about 6 1/4 mi down.

At Lyttleton, you're fairly protected from the NE, by the North Is. It happened about 1 am your time. I bet it's gone by now: they travel up to 800 kph. I'll leave you to do the calculations.

Ann

[Tillsbury]

The 8 was more recently, about 4 hours ago, and most of the east coast of the north island is under a mandatory evacuation order right now, waves expected around now. We're under a "beach and marine warning" of 0.3-1m waves, but even that might not be a lot of fun in a marina depending on how it arrives.

There's no one on the Kermadecs at present because of covid. I note that the two Raoul Island tsunami measurement devices went down a couple of hours ago

[laird]

Hope your all okay ,I've never experienced a quake more than 4.1, it felt like a truck rumbling last ,we just don't get stuff like that in the UK ,unless you go back about 8500 years

[boatman61]

Get a few every year here in Portugal.. rarely more than 3.. tho Azores had a 5 recently.. along with Madeira.

[laird]

[QUOTE=boatman61;3357115]Get a few every year here in Portugal.. rarely more than 3.. tho Azores had a 5 recently.. along with Madeira.[/QUOTE

There was a tsunami about 8500 years ago that wiped out the low lands between the UK and Europe , it has been estimated that the wave was 30ft high , if it can happen once

[Franziska]

Btw. Alert cancelled:

<blockquote class="twitter-tweet"><p lang="en" dir="ltr">The National Advisory issued following the earthquakes near the KERMADEC ISLANDS REGION is cancelled.</p>— National Emergency Management Agency (@NZcivildefence) <a href="https://twitter.com/NZcivildefence/status/1367667007621976064?ref_src=twsrc%5Etfw">March 5, 2021</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>

[boatman61]

[QUOTE=laird;3357160]

Originally Posted by boatman61

Get a few every year here in Portugal.. rarely more than 3.. tho Azores had a 5 recently.. along with Madeira.[/QUOTE

There was a tsunami about 8500 years ago that wiped out the low lands between the UK and Europe , it has been estimated that the wave was 30ft high , if it can happen once

True... 1755 in Lisbon an earthquake and tsunami almost destroyed the city and as recent as 1957 Faial eruptions led to half the population fleeing to the US.. Terciera also has eruptions and the sea levels to its South are in constant flux.. its an active area.

[GordMay]

New Zealand downgraded its tsunami threat level hours following several strong earthquakes — including one of the strongest to hit the South Pacific in modern history — after the National Emergency Management agency said in its latest update that the largest waves have now passed.
There were small wave surges in some places, including at Tokomaru Bay near Gisborne. By afternoon, the National Emergency Management Agency said the threat had passed and people could return to their homes, although they should continue avoiding beaches. Waves of 30 centimetres were measured by ocean gauges in Vanuatu, New Zealand and islands off Australia.
There were no reports of damage or casualties from the quakes.

The third and strongest quake, with a magnitude of 8.1, struck the Kermadec Islands, northeast of New Zealand's North Island at 8:28 a.m. local time. This came shortly after a 7.4 magnitude earthquake in the same region at 6:41 a.m.
Just a few hours earlier, at 2:27 a.m., a large 7.2 magnitude earthquake struck about 900 kilometres away on the east of the North Island and was felt by tens of thousands of people.