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#1170677 - 06/02/2013 13:45 Re: Tsunami [Re: adam93]
Steven Offline
Weatherzone Addict

Registered: 19/04/2006
Posts: 2141
Loc: 中国上૲...
BOM do know a lot about these types of events and in the past earthquakes of magnitude 8.0 at the Solomon Islands have caused tsunamis of about 10cm on the North Qld coastline.

Tsunamis of 10cm do not cause major damage and a land based warning is inappropriate

But, as I wrote earlier if there is a tsunami wave they will detect it and issue whatever warnings are required.

They may have to issue a marine warning/advisory later, will be interesting to see what happens

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#1170742 - 06/02/2013 19:59 Re: Tsunami [Re: Steven]
duckweather Offline
Weatherzone Addict

Registered: 20/12/2010
Posts: 2517
Loc: Wantirna, Vic
There are 10 buoys in event mode in the Pacific Ocean at the moment. If you click on the pulsating diamonds (buoys), you'll see some very interesting movements have occurred.

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#1199470 - 17/06/2013 17:40 Re: Tsunami [Re: duckweather]
duckweather Offline
Weatherzone Addict

Registered: 20/12/2010
Posts: 2517
Loc: Wantirna, Vic

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#1201256 - 25/06/2013 20:22 Re: Tsunami [Re: duckweather]
duckweather Offline
Weatherzone Addict

Registered: 20/12/2010
Posts: 2517
Loc: Wantirna, Vic
A tsunami has been confirmed to have occurred in Jersey Shore on June 13th this month. It is apparently only being reported on now NBC10 Philadelphia
Video report also in this link.

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#1242509 - 16/02/2014 10:27 Re: Tsunami [Re: Lindsay Knowles]
mad mick Offline
Weatherzone Addict

Registered: 12/11/2007
Posts: 1182
Loc: Aitkenvale,townsville
Interesting talking to a skipper the other day and when all that concern about a tidal wave here from Japan. He said he was working on his boat in the Ross Creek marina and said he heard a scraping noise and upon going out side seen the boat rising he said he recorded a one metre rise and fall with a following half metre rise which he advised the BOM of which they were not interested he looked at the bouy movement for that time and there was none could this be because he was in a small opening and not a larger area like a beach front begs the question does it not we all don't want to believe we could get one that the reef would protect us but would it.

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#1242537 - 16/02/2014 12:07 Re: Tsunami [Re: mad mick]
duckweather Offline
Weatherzone Addict

Registered: 20/12/2010
Posts: 2517
Loc: Wantirna, Vic
That’s a very interesting post mad mick wink

I too have witnessed (as a ‘yachty’ from the distant past) some interesting water behaviours, like the skippers’ observations, in the past.

Below is my opinion only and is not a scientific one (I am not a scientist). I may be wrong with some of my understandings here, so don’t take my words as fact.

A general sea level rise, meaning a general bay or ocean level rise possibly caused by a tsunami or other event causing an overall water volume increase, would affect all of a coast line to varying degrees, and its inlets. The currents generated and water volume can vary due to lay of the land and sea floor height.

For an inlet to be more affected in water volume/height, as against the possible levels registered by an at sea buoy, may be due possibly a coastal-hugging current or a directional (coming from one defined direction) physical flow of water being forced into an isolated pocket (e.g. inlet) where any physical change in the water volume may be more pronounced than in a greater body of water, such as a sea.

A sea level disturbance and momentum of after affects, following a tsunami in a distant or near place, may continue to affect currents and associated water volume as the energy continues to be expelled. A reef or land structure (such as an offshore sand bank ) may deflect much of this energy, but some of the energy may slip around the reef or sand bank, creating a temporary local or isolated surge/water behaviour in water volume in a waterway leading in and off from a coastal region.

When an event of this nature is seen and experienced, the timing of the at-sea buoy readings may not correspond with the noted sea/water level variation or temporary rise in an inlet. Therefore, an informal reading of this rise may not be recognized by some authorities as a formal recording (unless someone from that ‘authority’ was actually there at the time and/or there were many witnesses verifying their observations). The actual depth readings of a buoy in the ocean or even near a coast, which may contradict the visual observation of the skipper in an inlet, for example, may be because the tremendous volume of water off coast may be less affected by a ‘small’ surge (height recording) than a shallower inlet which may display a water disturbance much more readily.

The skipper you spoke to felt, saw and noted what he saw and I would believe him. He approached an authority for confirmation of his suspicions, but probably couldn’t confirm such, because ‘they’ weren’t there themselves to record such – leaving the skippers’ observations as personal ones only, unfortunately.

There are many ‘things’ which can cause an isolated and momentary water/sea level rise on/in a coastal region (local scale), such as;
* land or sea bed subsidence or rise
* nearby fresh water flooding - leaching into the coastal edge waters
* earthquake
* local tidal surges
*….and so many other things.

Sometimes what is happening in a coastal region is unrelated to the greater sea.
Sometimes an event from a far off place can cause physical energies to travel far and wide, disturbing seas and lands until the energy generated is finally dispersed through rebounding off or absorbed, for example, land structures, and depleted.

I hope I made sense here. I have been awake nearly all night and am a bit ‘dopey’ at the moment crazy tired

Cheers….dopey Duck.





Edited by duckweather (16/02/2014 12:08)
Edit Reason: spelling again

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#1252794 - 02/04/2014 11:17 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
There's just been a major quake with epicentre off Chile at 9:46am AEST. The USGS detected the preliminary magnitude as 8.0 with depth of 10km but these may be revised up or down.

Unknown yet whether or not a tsunami was caused but should know soon when data from tsunami detection buoys come in. At time of writing, the JATWC has issued a *NO THREAT* tsunami bulletin for Australia.

Below is a map showing possible max tsunami heights (metres) up til 1pm AEST generated by one of the tsunami models (Joint Research Centre). This model is still running so the forecast hasn't gone beyond 1pm yet. Of course tsunami's are typically only a few cm high as they travel up to 800km/hr across the open ocean but slow down & get bigger p as they approach the coast:

https://farm4.staticflickr.com/3824/13570837325_3d450eee95_b.jpg


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#1252807 - 02/04/2014 12:42 Re: Tsunami [Re: Lindsay Knowles]
Brett Guy Offline
Weatherzone Addict

Registered: 05/10/2010
Posts: 4840
Loc: Bently Park, Cairns
First Tsunami apparently hit within 40min at around 2m. Not too big luckily.

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#1252811 - 02/04/2014 13:08 Re: Tsunami [Re: Lindsay Knowles]
Brett Guy Offline
Weatherzone Addict

Registered: 05/10/2010
Posts: 4840
Loc: Bently Park, Cairns
Apperently it was a Thrust event but I can only guess it didn't achieve a huge vertical movement if it has only produced a 2m wave on the coast. I am starting to think these reports may be underestimating this event and that we may hear of far more destructive waves soon.

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#1252818 - 02/04/2014 13:58 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
The max amplitude recorded by tidal gauges in the area still stands at 2.11m so far as per below.

Also below is the water column readings from one of the nearby tsunami DART network buoys that was triggered into high resolution event mode:


MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
MATARANI PE 17.0S 72.1W 0021Z 0.53M / 1.7FT 24MIN
ARICA CL 18.5S 70.3W 0014Z 0.93M / 3.1FT 28MIN
PATACHE CL 20.8S 70.2W 0015Z 1.51M / 5.0FT 10MIN
IQUIQUE CL 20.2S 70.1W 0005Z 2.11M / 6.9FT 12MIN
PISAGUA CL 19.6S 70.2W 0004Z 1.73M / 5.7FT 12MIN


https://farm4.staticflickr.com/3765/13573070453_135138752d_b.jpg
https://farm4.staticflickr.com/3815/13573016755_fe95bfe20c_o.png



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#1252903 - 03/04/2014 06:01 Re: Tsunami [Re: Lindsay Knowles]
perrywinkle Offline
Weather Freak

Registered: 04/08/2006
Posts: 422
Loc: Warrawee Valley
58cm Tsunami in Hawaii. Many NOAA bouys going off across the pacific now. May not be big, but will influence our east coast waterways.

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#1252905 - 03/04/2014 06:20 Re: Tsunami [Re: perrywinkle]
perrywinkle Offline
Weather Freak

Registered: 04/08/2006
Posts: 422
Loc: Warrawee Valley
Originally Posted By: perrywinkle
58cm Tsunami in Hawaii. Many NOAA bouys going off across the pacific now. May not be big, but will influence our east coast waterways.


National 'no threat' posted by JATWC seems to have been removed overnight.

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#1252948 - 03/04/2014 13:22 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
Can see the reach of the tsunami's energy in the MOST model output below albeit at much lower amplitudes away from the quake:

https://farm6.staticflickr.com/5012/13593589573_45ece32d21_o.png


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#1252953 - 03/04/2014 14:01 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
There's just been another sizeable one in the area at 1:43pm AEDT, presumably one of the aftershocks. Preliminary mag 7.4 with depth 10km. Pre-calculated output from the JRC's tsunami model:

https://farm8.staticflickr.com/7145/13594534704_2a9df0c09a_o.jpg


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#1252956 - 03/04/2014 14:18 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
Magnitude of this latest shake now revised up to 7.8

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#1259169 - 13/04/2014 06:54 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
There's just been a major quake with epicentre off the Solomon Islands at 6:14am AEST....preliminary magnitude 7.6 with depth of 29 km.

Unknown yet whether a tsunami was generated. Here's the output from the JRC's tsunami model based on the closest precalculated scenario (the more refined output is still running as obs start coming in):

https://farm3.staticflickr.com/2868/13805961625_663639bfa6_o.jpg


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#1322621 - 30/03/2015 11:36 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
Some automatically generated graphics from the USGS and JRC below for the preliminary magnitude 7.7 quake that occurred in the PNG region at 10:49am AEDT:






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#1327958 - 05/05/2015 12:23 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
Big 7.4 quake in the New Britain region of PNG again (11:44am AEST). Depth now revised to 63km though so not that shallow. Some preliminary tsunami modelling results from the JRC (which may be overdoing it if it's based on the preliminary depth of 10km):


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#1335895 - 18/07/2015 13:14 Re: Tsunami [Re: Lindsay Knowles]
Ken Kato Offline
Weatherzone Addict

Registered: 05/03/2012
Posts: 4313
Big 7.3 (preliminary) quake with depth of 4km (GA data) in the Santa Cruz Islands region north of Vanuatu at 12:27pm. No tsunami threat to Australia itself at this stage:




Edited by Ken Kato (18/07/2015 13:16)
Edit Reason: tsunami threat downgraded

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#1335896 - 18/07/2015 13:26 Re: Tsunami [Re: Lindsay Knowles]
Knot Online   content
Weatherzone Addict

Registered: 01/05/2014
Posts: 1556
Loc: Blue Bay N.S.W
Thanx Ken. JATWC has no warning up.

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