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Old 12-01-2013, 17:58   #1
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Abnormal Wave, Jan. 1, 2013

First absolutly no drink was involved and an early night the night before.

January 1, this year, around 4:00PM, we were 5 miles or so off of southern Dominica, coming into Roseau. I looked from the boat, heading south toward land and saw a wave that was breaking. It was one wave and a couple of miles long. Could not really see how long it was.

I thought it would stop, but it kept coming and kept breaking all along its one ridge. I watched this for about a mile and when I decided that it was not going to stop, and it was getting close, maybe 1/4 mile, I headed into it. The single wave was at least 12 feet, maybe 15? We went over it and then it continued. They rest of the waves were around 4 feet. This was very abnormal.

What I am thinking and want to find out is if there was a earthquake in the area that day?
THoughts? Aloisius
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Old 12-01-2013, 18:07   #2
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Re: Abnormal Wave, Jan. 1, 2013

It must have not been too big, It's not on the list yet. >>> List of rogue waves - Wikipedia, the free encyclopedia
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Old 12-01-2013, 18:13   #3
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Re: Abnormal Wave, Jan. 1, 2013

Google earth will list all the earthquakes in the area.
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Old 12-01-2013, 18:36   #4
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Re: Abnormal Wave, Jan. 1, 2013

There has been some earthquake activity in that area but not on that date. Mostly Jan. 4th.
Link>>> IRIS Seismic Monitor
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Old 12-01-2013, 18:47   #5
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Re: Abnormal Wave, Jan. 1, 2013

In the Caribbean, between the islands, the winds seem to accelerate around the ends of the islands - thereby causing higher waves than normal. I noticed that on one passage we did when we were about 100 miles from the island chain. We noticed that the seas were building in certain areas and when we plotted the course, the higher seas corresponded with the breaks between the island, even though we were far from land. The islands are high enough to create calm seas quite far west of the land mass, and all that water has to get between the land masses the islands create, thereby making for higher seas. And they will wrap around the islands for a bit.
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Old 13-01-2013, 06:44   #6
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Re: Abnormal Wave, Jan. 1, 2013

Real-time Earthquake Map

If you are interested in earthquakes and how many and where there are, look at this from USGS
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Old 13-01-2013, 06:59   #7
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Re: Abnormal Wave, Jan. 1, 2013

Submarine landslides can cause waves like that. They're usually, but not always, triggered by seismic activity.
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Old 13-01-2013, 07:51   #8
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Re: Abnormal Wave, Jan. 1, 2013

Quote:
Originally Posted by landonshaw View Post
First absolutly no drink was involved and an early night the night before.

January 1, this year, around 4:00PM, we were 5 miles or so off of southern Dominica, coming into Roseau. I looked from the boat, heading south toward land and saw a wave that was breaking. It was one wave and a couple of miles long. Could not really see how long it was.

I thought it would stop, but it kept coming and kept breaking all along its one ridge. I watched this for about a mile and when I decided that it was not going to stop, and it was getting close, maybe 1/4 mile, I headed into it. The single wave was at least 12 feet, maybe 15? We went over it and then it continued. They rest of the waves were around 4 feet. This was very abnormal.

What I am thinking and want to find out is if there was a earthquake in the area that day?
THoughts? Aloisius
This reminds me of a similar incident mentioned on CF several years ago (couldn't find the post) in which a commercial fisherman encountered such a wave but larger off the coast of Southern California. Was this wave traveling in the same direction as the other waves?
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Old 13-01-2013, 08:25   #9
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Re: Abnormal Wave, Jan. 1, 2013

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Originally Posted by DeepFrz View Post
Google earth will list all the earthquakes in the area.

I was not aware of that, thanks

Foggy
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Old 13-01-2013, 08:37   #10
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Re: Abnormal Wave, Jan. 1, 2013

The wave was generally traveling in the same direction as the other waves. Roseau is in the soutern part of Dominic. Fairly close to the end of the island, maybe 8 to 10 miles. The wave was coming from the land out to sea. I was about 5 miles out and picked it up about 1 1/2 miles east of me. At first I thought it was a local boat wake, but then saw no boat and watched as it got closer. Happily I headed into it, it would have been very wet had it hit the side of the boat.
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Old 13-01-2013, 13:36   #11
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Re: Abnormal Wave, Jan. 1, 2013

Submarine landslide was my thought also, as I can't think of any other plausible explanation, especially since land was in the way for it to be a freak coincidence of a number of underlying wavetrains coinciding at a peak. Furthermore, you would expect other waves building up to and decaying from that highest individual wave, if it was a question of summation.Landslides on dry land can happen in the absence of seismic activity, indeed they usually do, so I see no reason to doubt Cormorant's assertion that this is also possible for underwater landslides.
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Old 13-01-2013, 13:40   #12
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Re: Abnormal Wave, Jan. 1, 2013

An 8.8m racing sailboat was pitchpoled near here some years back while motoring in a flat calm at sea, but near a peninsula, in about 15m -20m depth. A single wave. In this case, travelling from offshore.
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Old 13-01-2013, 15:15   #13
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Re: Abnormal Wave, Jan. 1, 2013

where is here?
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Old 13-01-2013, 15:18   #14
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Re: Abnormal Wave, Jan. 1, 2013

landslide tsunami's ?

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Old 13-01-2013, 15:40   #15
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Re: Abnormal Wave, Jan. 1, 2013

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where is here?
The pitchpole was at about 43deg 38.5m S, 173deg 03.0m E
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