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Kunich's Awesome Resume
On Jan 10 2005, 6:29 pm, "Tom Kunich" wrote:
"Bob Schwartz" wrote in message ... wrote: So, tell us the worst tsunami to ever hit the USA? While you're at it perhaps you'd like to explain the source of tsunamis. Oh, and be detailed on it since I have studied vulcanology and Seismology a bit. http://www.ngdc.noaa.gov/seg/hazard/tsu.shtml An online database of both source events and runup data. Hawaii and Alaska get hit a lot. California gets hit a lot too, although the effects tend to be minor. Any oceanic faultline is a source, in the US that mostly means Alaska. A 1933 tsunami off the coast of Southern California killed three people in La Jolla. A 1946 Aleutian tsunami killed 165 people total including 128 people in Hawaii and one person in Santa Cruz. But of course, you already knew that. I'm posting this for the benefit of the unwashed masses that are less learned than yourself. Bob Schwartz The main reasons that people in the USA aren't killed by tsunamis is because the worst ones are caused either by major eruptions of underwater volcanoes or by a rapid vertical jerk-type earthquake in a subduction zone. Also the coasts of the USA are wide open to the ocean and hence don't cause the focusing effects that often multiply wave size and power. None of those sources are close to the USA and hence the chances of any major damage from a tsunami are relatively minor at best. snip Dumbasses - The above posts, after the Indonesian tsunami, were so absurd that they stuck in my memory. Kunich is an expert on vulcanology and seismology. heh heh. One of the numerous branches of science about which he is oh-so-knowledgable. A true polymath. Remember, none of the subduction zones are close to the USA. From: http://www.livescience.com/forcesofn...a_tsunami.html Tsunami-Generating Earthquake Near U.S. Possibly Imminent By Robin Lloyd Special to LiveScience posted: 03 January 2005 07:21 pm ET There are only two places in the United States where colliding tectonic plates could cause a major tsunami, and new studies show a new earthquake in at least one of these locations could be imminent. The Cascadia subduction zone, a 680-mile fault that runs 50 miles off the coast of the Pacific Northwest -- from Cape Mendocino in California to Vancouver Island in southern British Columbia -- has experienced a cluster of four massive earthquakes during the past 1,600 years. Scientists are trying to figure out if it is about to undergo a massive shift one more time before entering a quiescent period. "People need to know it could happen," said U.S. Geological Survey geologist Brian A****er. The historical record for this zone, which has the longest recorded data about its earthquakes of any major fault in the world, shows that earthquakes occur in clusters of up to five events, with an average time interval of 300 years between quakes, said Chris Goldfinger, a marine geologist at Oregon State University. Goldfinger and other scientists have been studying this subduction zone for many years. The two most recent quakes on this fault occurred in the year 1700 (a magnitude 9 event) and approximately the year 1500. It has now been 305 years since the last event. So is the Cascadia subduction zone finished for now or on the brink of event number five? "We know quite a bit about the periodicity of this fault zone and what to expect," he said. "But the key point we don't know is whether the current cluster of earthquake activity is over yet, or does it have another event left in it." At the Cascadia subduction zone, an oceanic tectonic plate called the Juan de Fuca is pulled and driven (subducted) beneath the continental North American plate, setting up conditions for undersea "megathrust" earthquakes. The Cascadia subduction zone occurs where the relatively thin Juan de Fuca plate moves eastward and under the westward-moving North American Plate. When that collision results in a rupture, massive earthquakes occur. The other active subduction zone capable of producing a major earthquake-tsunami sequence is in Alaska, the site of a giant earthquake and subsequent tsunami in 1964. Scientists say a rupture along the Cascadia fault would cause the sea floor to bounce 20 feet or more, setting off powerful ocean waves relatively close to shore. The first waves could hit coastal communities in 30 minutes or less -- too rapidly for the current warning systems to save lives. snipend |
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