Snider added: "We don't have a really good forecast because this event is based on a volcano rather than earthquake."
Berkeley Fire Department have ordered a mandatory evacuation for people living in the Marina or the surrounding area.
The tsunami, creating 2-3ft waves is due to hit at 7.30am PT.
The wave, estimated to be between one to two feet high is predicted to hit San Francisco's coast at 8.10am PT, according to the US National Weather Service San Francisco Bay Area in their latest update.
It said the tsunami will coincide with the area's high tide at 9.09am and warned "minor flooding" was possible, "especially for areas like Marin Headlands".
ooooh, a 2-3 foot wave. Scary. Momma Gubmint needs to protect us.
ReplyDelete2-3 foot is skawy, but what if Big bad Man Kim Jong Zero shoots up something like Bezos' dildo, up in the air at the same time?
DeleteBe vewy vewy afwaid.
So, did it hit? Did anyone notice?
ReplyDeleteA two or three foot wave on the mid-ocean piles up quickly in shoal waters. As the front waves slow down the mass of water behind it piles up. Depending on the direction and shape of the ocean floor there can be a wave of 5 to 30 foot high.
ReplyDeleteHave we alerted Lex Luthor?
DeleteA wave becomes a shallow water wave when the depth is 1/2 or less the wave length. Tsunamis have a wave length meeasured in miles, all other waves, excepting lunar tides, have a WL measured in tens of feet.
ReplyDeleteNear shore, the wave will heap up so a 1 or 3 foot wave may result in a tall wall of water, the height dependant upon topography both below and above sea level.
The thing about a tsunami is it keeps coming and coming for a period of 20 minutes or more. The following part of the wave stacks upon the preceeding part.
There is more to it but a tsunami is no laughing matter. I was aboard in Honolulu Harbor when a 10 inch tsunami came ashore. The Navy put all their ships to sea. The actual wave was a dud, that there was not a tall of water, but there was quite a surge of several feet which lasted several hours. The aftermath, as water drained, was as damaging.
The 2011 tsunami at Japan was a one to 1 meter open ocean wave. The destructive force was amplified by bottom contours
'... one to 2 meter ...'
DeleteTsunamis are not at all like surface waves, which are wind or current-driven and only have effects in the first few feet from surface. Tsunamis are called 'a wall of water' because the wave form extends all the way to the seabed. The whole body of water is moving in response. Back a few decades ago there was a strong subsea earthquake off Vietnam, where a semi-submersible drilling rig was moored, drilling a well. Shortly after the earthquake, the tsunami rolled past the location. The rig had an 8-point mooring system - that is, 8 separate anchor chains stretched out symmetrically, each leg about a mile long, with a ~15 ton anchor on the end and about 100 tons of tension on each leg, to keep the rig positioned over the well. Well, the tsunami rolled past, virtually invisible on surface out there in deep water, but.... half the chains snapped.
ReplyDelete