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#1336393 - 24/07/2015 13:09 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4391
Here's the full text from the alert I received earlier re the undersea Caribbean volcano and any upcoming tsunami risk:


Potential Kick ’em Jenny Activity (Orange Alert) and the Associated Tsunami Threat Statement from the Pacific Tsunami Warning Center and US National Tsunami Warning Center

Kick 'em Jenny is an active submarine volcano or seamount on the Caribbean Sea floor, located 8 km (5 mi) north of the island of Grenada and about 8 km (5 mi) west of Ronde Island in the Grenadines at roughly 12.30° N, 61.64° W. Its summit is approximately 200 m (600 ft) below the surface of the ocean.

What?
The Seismic Research Centre (SRC) of the University of the West Indies has issued an Orange Alert for the underwater volcano Kick ’em Jenny1. An Orange Alert means “Highly elevated level of seismic and/or fumarolic activity or other unusual activity. Eruption may begin with less than twenty-four hours notice.”

Why?
Instruments monitored by SRC recorded strong, continuous seismic activity from the volcano between 1:25 am and 3:00 am, local time, July 23, 2015 suggesting than an eruption could occur with less than 24-hours notice. Signs of elevated seismicity (earthquakes) began on July 11th and continue to the present.

What is the tsunami threat?
An undersea volcanic eruption can displace the overlying seawater, generating tsunami waves. The amplitude of the waves and area threatened depends upon many factors including the size, depth, and nature of the eruption. Should a tsunami occur, waves would reach Grenada within just a few minutes. If the tsunami were large enough to expand further, it would reach St. Vincent within 10 minutes, Martinique and Tobago within about 30 minutes, and Barbados within about 40 minutes. A very large tsunami could reach the northern coast of Venezuela to the south and the Leeward Islands and Puerto Rico within an hour and a half. Any tsunami hazard would be confined to the Caribbean region.

What is being done?
Kick 'em Jenny activity is being closely monitored by the SRC and further updates will be issued by SRC as more information becomes available. The Pacific Tsunami Warning Center and US National Tsunami Warning Center are also following the situation closely and will be monitoring seismic and sea level data from the nearest seismic and coastal sea level gauges. Should an eruption be confirmed and/or tsunami be detected they will issue appropriate messages to their respective areas of responsibility in the Caribbean region. Citizens are reminded to follow all instructions from their local emergency management. Some rules for tsunami safety and response can be found at: http://www.nws.noaa.gov/om/Tsunami/
SRC recommends that vulnerable communities be advised of evacuation routes and transport be put on standby. SRC indicates that local radio stations in Grenada, St. Vincent, Barbados and Trinidad have been placed on alert. SRC recommends that the public listen to their local radio continuously for updates and visits the Seismic Research Center website if possible..SRC instructs that shipping vessels should stay outside of the first exclusion zone - 1.5 km from the summit of Kick ’em Jenny and that non-essential shipping, such as pleasure craft, should stay outside of the secondary exclusion zone – 5 km clear of the summit.

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#1368266 - 03/03/2016 00:42 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4391
EDIT: A Tsunami Marine Warning still current for Christams and Cocos Island.
The Tsunami Land Watch issued for parts of the WA coast is now cancelled.

Huge quake just occurred off Sumatra... preliminary mag 8.1, depth near the surface (Geoscience Australia data).

JAWTC map and some preliminary results from JRC tsunami modelling below:










Edited by Ken Kato (03/03/2016 00:48)
Edit Reason: added stuff

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#1394322 - 22/11/2016 08:31 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4391
Big quake just off northeast Japan. JMA currently has it as a preliminary mag 7.3 and has a tsunami warning current at time of writing (there's already been some near-coastal measurements of an observed tsunami):



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#1394330 - 22/11/2016 09:37 Re: Tsunami [Re: Lindsay Knowles]
ColdFront Offline
Meteorological Motor Mouth

Registered: 29/06/2008
Posts: 17293
Loc: Wide Bay..Near the beach
3 metres high according to a breaking news article out of Japan. There is some video around their ports showing the surge .
_________________________
"I don’t play golf, but I don’t mean to denigrate those who do. And for the people who play golf , denigrate means *put down*."

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#1394334 - 22/11/2016 10:13 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4391
Highest confirmed tsunami measurement so far is 1.4 metres.
The 3m was an initial forecast.

This was some of the water surging into a port in Iwaki earlier (there was also a well-defined drawdown leaving the mud at the bottom of the harbour entrance clearly visible):

EDIT: 1.4m observed







Edited by Ken Kato (22/11/2016 10:14)
Edit Reason: added stuff

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#1394335 - 22/11/2016 10:28 Re: Tsunami [Re: Lindsay Knowles]
ColdFront Offline
Meteorological Motor Mouth

Registered: 29/06/2008
Posts: 17293
Loc: Wide Bay..Near the beach
The quake has been downgraded to 6.9 apparently.
_________________________
"I don’t play golf, but I don’t mean to denigrate those who do. And for the people who play golf , denigrate means *put down*."

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#1394336 - 22/11/2016 10:28 Re: Tsunami [Re: Lindsay Knowles]
Pharbelle Offline
Weather Freak

Registered: 29/04/2013
Posts: 119
Loc: Burrum Heads , Qld
Incredible watching that surge move back and forth through the port.

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#1394338 - 22/11/2016 11:15 Re: Tsunami [Re: Lindsay Knowles]
ozone doug Offline
Weatherzone Addict

Registered: 06/11/2006
Posts: 1580
Loc: Roma SW QLD Eye to the West...
Would be terrifying for people in the region after the last one.Even if a minor surge.I would been hauling my butt out of there .We are so lucky in Australia apart from fire we get a bit of warning for most events.
_________________________
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BOM Stormspotter G0388 Roma S W Queensland Formerly Redcliffe.
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