Showing posts with label tsunami. Show all posts
Showing posts with label tsunami. Show all posts

Monday, July 25, 2011

Japan's tsunami was 132 feet tall

How big was the Japanese tsunami this year? Reseachers now say 132.5 feet, or 40 meters. Wow. That's the biggest tsunami ever to hit Japan, and bigger than the tsunami that devastated coastlines around Indonesia in 2004.

As if that's not big enough, the largest tsunami ever was 1,720 feet (524 meters), trigerred by a rock and ice fall in a small inlet in Alaska in 1958. Yikes. That's taller than the Empire State Building in New York.



Thursday, March 31, 2011

Tsunami wipes out Japan's whaling?

Is whaling finished in Japan now that the tsunami wiped away infrastructure and perhaps the will to rebuild this beleaguered industry? People from small coastal whaling towns are reacting with shock and horror to the damage, and some don't see a future.

Japan's whaling industry was already reeling before the tsunami, so perhaps it's time to let go.

But others vow to continue whaling and the government of Japan is not pleased about newspaper stories predicting the industry's demise. Indeed, there's another side to the industry beyond the traditional and cultural relevance that keeps Japan going after whales.

The big distant-water boats that fish in the southern Oceans are government-run, and at least some of them are undamaged because they were out at sea when the tsunami struck. There are plenty more battles to be fought before all Japanese whaling stops. One sticky reason for Japan's persistence might be the cushy jobs for bureaucrats that the whaling industry generates.

Besides that, there are the international precedents that would be set if Japan caves in to foreign demands to stop whaling. What comes next, cutbacks in tuna fishing? Reduced access for Japan's fleets to other resources?

Monday, March 28, 2011

Seafood crisis in Japan

Seafood demand is down in Japan, way down. "The fish are here, but nobody's buying," says one fish seller about business at the Tsukiji auction, Japan's premier fish market.

Tsukiji is normally a busy city, with some 60,000 workers, but prices have plunged by up to 50% for some seafood products.

"The drop in demand from sushi restaurants and the cancellation of weddings and banquets at hotels are partly to blame," an official of the market's marine and agricultural produce section said.

Radiation fears are also a problem according to mysinchew.com:

Food safety fears have risen since radiation from the coastal Fukushima plant has been detected in vegetables and dairy products grown nearby, and after iodine levels in Tokyo tap water rose above levels safe for infants.

There has been no official warning about the impact on marine life, but operator Tokyo Electric Power Co. said Thursday that iodine-131 levels in the ocean near the plant were 145 times the legal level, Kyodo News reported.

Japan's seafood world is reeling, and the outcome is far from clear. The problems will likely persist for some time. The biggest long-term risk may be the radiation scare that already has some seafood buyers scared (see photo above of a chef screening imported seafood for radioactivity).


Monday, March 21, 2011

People will die without weather satellites

This is what a leader looks like. US Congressman Peter DeFazio says "people will die" if we cut funding for things like weather satellites, disaster preparedness, etc., all of which are budget cuts proposed by the Republicans in the US.

He should know. In his district (where I used to live), the recent tsunami devastated a harbor and swept people out to sea.



From Climate Progress, quoting Think Progress:

DeFazio represents Oregon’s 4th district, where the tsunami devastated a local harbor and swept more than four people out to sea. DeFazio told ThinkProgress that furloughs at NOAA and other cuts to “our defense” against natural disasters were “crazy stuff” that would weaken the federal government’s already outdated disaster response system:”If you cut on detection of tidal waves, volcanic eruptions, severe weather events, weather buoys, satellite observation and weather patterns, those sorts of things, people will die. People will die from tornadoes in the Northwest, hurricanes or volcanic eruption or earthquakes. They are also cutting on preparedness funds that go down to the local organization down to the cities and counties, down to the first responders who need equipment.”
I'm proud to say this man was my representative the first time I voted, and he's still there plugging away doing good. Go Peter DeFazio!

Wednesday, March 16, 2011

How an earthquake spawns a tsunami

Watch the birth of a tsunami (video clip below) from a subduction zone earthquake. This scenario is similar to the recent Japanese earthquake and tsunami. Then watch it spread ominously outward in the open water and start hunting for land.



Hat tip: juliawhitty

Tuesday, March 15, 2011

Natural disasters and ocean ecosystems

How did the Japanese earthquake and resulting tsunami affect the oceans?

Really, we don't know, but it's nearly certain that ocean effects are less dramatic than effects on people.

Here's an excerpt from an interesting article on the 2004 tsunami in Southeast Asia:

"...man was not alone in feeling the impact. Ecosystems and other species were also hit.

To be sure, photographic and video images relayed by the media have shown trees swept away by waves and water-drenched lands. Other reports have mentioned wildlife that escaped the destruction, as some sort of instinct seemed to tell them to seek higher ground prior to the arrival of the tsunami waves. And yet the full scope of the tsunamis’ environmental impact remains under-reported, despite its obvious importance for the recovery of the affected areas and the well being of the survivors.

Experience from previous tsunamis and other major floods suggests that the environmental damage they inflict is linked to saltwater intrusion in ground water and to the disappearance or relocation of beaches. Tsunamis may make small, low islands uninhabitable. Vegetation in large stretches of lowland can be hurt substantially as saltwater-tolerant mangroves and grasses take over from other species. For rare animals with specific reproduction sites, like marine turtles, the tsunami’s effects could spell extinction.

But whereas the damage to the environment on land can be seen, the ravages imposed on the marine environment are hidden. Obviously, when extremely strong waves hit coral reefs, some coral breaks off. But this is a comparatively small problem. The surface of coral is highly sensitive, and will now be exposed to major damage from all sorts of silt and debris carried back by water receding from flooded land.

At the same time, the material brought back from land to sea include nutrients and trace elements that cause a boom among plankton, which in turn feed other marine biota. Locally, but sometimes still at a grand scale, the shock waves cause major sediment slides on steep underwater slopes such as those of the continental shelves.

Closer to the shore, many natural ecosystems, most notably coral reefs and mangroves, act as natural shock absorbers and wave breakers. During the past several decades, these ecosystems have been damaged and reduced in most countries along the Indian Ocean. Indeed, the damage from the tsunami waves was far more devastating than it would have been had they still been intact.

Wildlife may fare better than the physical environment. This is particularly true of fish stocks, owing to large-scale destruction to fisheries. More than 13,000 fishermen were killed and another 5,000 evacuated in Sri Lanka alone, with 80% of the fishing fleet lost or severely damaged. On the Thai coast, according to the UN Food and Agriculture Organization, 4,500 fishing vessels were smashed, jeopardizing the livelihoods of 120,000 people in fishing villages there.

The situation on Sumatra is similarly grim, and it is perhaps even worse in the Maldives, Laccadives, Andamans, and Nikobar islands, where not only fishermen and boats were lost, but harbours were ruined. Along the coast of the Indian states of Andhra Pradesh and Tamil Nadu, some 30% of the fishery capacity was lost. Mozambique, Somalia, and Tanzania on the African side of the Indian Ocean have also reported severe damage to their fishing.

Such major losses in fishing capacity, with their far-reaching negative socio-economic consequences on the human populations affected, are bound to have major, mostly favourable, effects on the fish stocks. The reason is simple: with most fish populations nowadays hit hard by over-fishing, fewer fishermen will mean more fish. Another factor that will help fish stocks is a religiously motivated hesitation by the public in some areas to eat marine fish, as they are perceived to have fed on human corpses washed to sea."

And here's an index of tsunami information from National Geographic.

Friday, March 11, 2011

Broken ocean metaphors

Big, bad, and scary? Or fragile and threatened? Which ocean are we thinking about today?

With ocean-caused death and destruction
dominating the media, the ocean looks big and nasty today. It's the savage blue killer that engulfs, crushes and drowns cities, sweeping
away cars and whole buildings. The images are shocking and horrifying and they linger in our minds.

What then of our ocean conservation campaigns that request care, caution, and concern from people for the sake of protecting our fragile and threatened ocean? Will a plea like this attract people, or will we get a big WTF?

Maybe we need to rethink our ocean conservation messages. Save the fragile ocean sounds a bit ridiculous when the ocean just finished slapping us around bigtime.

Tsunami wave model 11 March 2011

Amazing, watch the animation:


Julia, how do you find such great stuff??