Mega Tsunami 0 Kommentare zu "Monsterwelle in Alaska: Mega-Tsunami durch 180 Millionen Tonnen Fels"
Megatsunamis, eigentlich Impakt-Tsunamis, werden Tsunamis mit einer Wellenhöhe genannt, die deutlich über der von durch Erdbeben ausgelösten Tsunamis liegt. Nach einem Vorschlag des Geologen und Tsunami-Forschers James Goff handelt es sich um. Megatsunamis, eigentlich Impakt-Tsunamis, werden Tsunamis mit einer Wellenhöhe genannt, die deutlich über der von durch Erdbeben ausgelösten Tsunamis. Diese enorme Menge hatte einen Megatsunami zur Folge. Bis zu einer Höhe von Metern wurden die Bäume am Ufer der Bucht weggespült. Die Welle. Meter hoch türmten sich die Wellen in einem Fjord in Alaska auf, als dort ein Mega-Tsunami ans Ufer schlug. Jetzt ist klar, was die Fluten. Forscher rekonstruieren Mega-Tsunami, der sich in Alaska ereignete. Millionen Tonnen Gestein donnerten damals in einen Fjord.
Die Bruchkante ist über zwei Kilometer lang und sogar auf Satellitenbildern deutlich erkennbar. Zwar kommen sogenannte Megatsunamis in. Forscher rekonstruieren Mega-Tsunami, der sich in Alaska ereignete. Millionen Tonnen Gestein donnerten damals in einen Fjord. Megatsunamis, eigentlich Impakt-Tsunamis, werden Tsunamis mit einer Wellenhöhe genannt, die deutlich über der von durch Erdbeben ausgelösten Tsunamis. Hauptseite Themenportale Zufälliger Artikel. Allerdings sei die Energie solcher punktuell ausgelösten Wellen wesentlich Lapse als nach Erdbeben - sie verpuffe mit zunehmender Are Filme Online Stream 2019 question vom Ursprung wesentlich schneller link die Wellen verlieren an Höhe. Seitdem zog Johnny Simmons der Tyndall-Gletscher jedoch um 17 Kilometer zurück, zugleich verringerte sich die Mächtigkeit der Eiszunge um Meter. Die höchsten bekannten Tsunamiwellen wurden ebenfalls in Alaska gemessen: Am 9. Selbst die stärkste Seebeben können den Meeresboden höchstens um zehn bis 15 Meter anheben. Einige Geologen befürchten, dass bei weiteren Vulkanausbrüchen eine Flanke der Cumbre Vieja in den Atlantik rutschen könnte. Satellitenbild von Herschel Island mit gut sichtbaren Sedimentfahnen vor der Küste. This research was later found to be flawed. One survivor suffered serious injuries requiring hospitalization. Ulrich Mr. The eruption of Krakatoa created pyroclastic flows which generated megatsunamis when they hit the waters of the Sunda Strait on 27 August Retrieved April more info, These waves, however, did not show any definite movement either toward the head or the mouth of the bay. Underwater earthquakes or volcanic eruptions do not normally generate such large tsunamis, but landslides next to bodies of water resulting from see more can, since they cause a large amount of displacement. Miller was in Alaska when the July wave occurred and flew to Lituya Bay the following day. BBC Two. Category Commons. They were washed back into the bay and both survived. It is slowly—really slowly—moving toward the ocean, but it's been happening for a very long time. A megatsunami is a tsunami — a large go here due to displacement of a body of water — with an initial wave amplitude height measured in several tens, hundreds, or possibly thousands of metres. June 12—15, The cliff on the northeast wall of Gilbert Inlet showing the scar of the 40 million cubic yard Neither water drainage from https://cr3w.co/serien-hd-stream/cartoon-serien-stream.php lake, nor landslide, nor the force of the earthquake itself led to the megatsunami, although all of these may have contributed. Mccrea Joel a BBC television documentary broadcast inexperts said that they thought that a landslide on a volcanic ocean island is the most likely future cause of a megatsunami. December Earthquake History of the United States. Sie glauben, dass eine riesige Flutwelle eines Tages die dicht bevölkerte Küstenregion am Atlantik überschwemmen wird - ein Mega-Tsunami. Die Bruchkante ist über zwei Kilometer lang und sogar auf Satellitenbildern deutlich erkennbar. Zwar kommen sogenannte Megatsunamis in. Mithilfe von neuesten CGI-Effekten zeichnet das aufwendig produzierte BBC-Doku-Event minutiös die Ereignisse nach, die zu einem Mega-Tsunami führen. Megatsunami. Megatsunamis, eigentlich Impact-Tsunamis, werden Tsunamis genannt, deren Höhe im Küstenbereich Meter übersteigt. Da Erdbeben nach. Kollabieren Vulkane nahe einer Küste, drohen Mega-Tsunamis. Der Aufprall ganzer Gesteinsflanken verdrängt immense Mengen Wasser.
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It is about seven miles long It has a maximum depth of about feet meters , but a sill of only 32 feet 9.
The Fairweather Fault trends across the northeast end of the Bay and is responsible for the T-shape of the bay. Glacial scour has exploited the weak zone along the fault to produce a long linear trough known as the Fairweather Trench.
The rockfall of July 9, occurred on steep cliffs above the northeast shore of Gilbert Inlet.
It is marked on the map above in red. The rocks fell from an elevation of about feet meters.
The impact of 40 million cubic yards This wave stripped all vegetation and soil from along the edges of the bay.
This damaged area is shown in yellow on the map above. The numbers are elevations in feet of the upper edge of the wave damage area and represent the approximate elevation of the wave as it traveled through the bay.
The wave damaged areas along the edges of the bay. Areas where soil and vegetation were removed are still clearly visible. They are the light green areas of different vegetation color around the rim of the bay.
Lituya Bay a few weeks after the tsunami. The areas of destroyed forest along the shorelines are clearly recognizable as the light areas rimming the bay.
A fishing boat anchored in the cove at lower left was carried over the spit in the foreground; a boat under way near the entrance was sunk; and a third boat, anchored near the lower right, rode out the wave.
Photo by D. Miller, United States Geological Survey. This is an isoseismal map showing the impact of the Magnitude 7. Lituya Bay was in the area of XI intensity.
The isoseismal contours near the epicenter parallel the Fairweather Fault. Stover and Jerry L. Coffman, U. The cliff on the northeast wall of Gilbert Inlet showing the scar of the 40 million cubic yard The head of the slide was at an altitude of about 3, feet meters , just below snowfield in upper center.
The elevation of water in Lituya Bay is sea level. The front of Lituya Glacier is visible in the lower left corner.
The front of Lituya Glacier with lateral and medial moraines is seen terminating in Gilbert Inlet. The cliff where the rockslide originated is on the right side of Gilbert Inlet.
The opposite valley wall on the left side of Gilbert Inlet received the full force of the big wave, stripping it of soil and trees.
The spur of land between Gilbert Inlet and Lituya Bay that received the full force of the wave. Trees and soil were stripped away to an elevation of feet meters above the surface of Lituya Bay.
Wave damage areas along the shorelines of Lituya Bay, viewed from the south. Stump of living spruce tree broken off by the giant wave at Harbor Point, mouth of Lituya Bay.
Brim of hat is 12 inches in diameter. This tree is located about seven miles Tree trunks can be seen in the water and tree stumps along the lower shoreline.
This location is seven miles A third boat was in Lituya Bay at the time of the tsunami. It was anchored near the mouth of the bay and was sunk by the big wave.
There are no known survivors from this boat, and it was believed that there were two people on board. Prior to the July, tsunami, Don J.
Miller of the United States Geological Survey had been studying evidence for the occurrence of large waves in Lituya Bay.
He had documented evidence for at least four previous large waves with estimated dates of , , , and or All of these waves were significant in size, but shoreline evidence for all of them was removed by the wave.
Miller was in Alaska when the July wave occurred and flew to Lituya Bay the following day. With such a history of large waves, Lituya Bay should be considered as a dangerous body of water prone to a few large waves every century.
When will the next one occur? Find Other Topics on Geology. Maps Volcanoes World Maps. Ulrich Mr. Ulrich and his 7-year-old son, on the Edrie, entered Lituya Bay about p.
The glacier had risen in the air and moved forward so it was in sight. It must have risen several hundred feet. I don't mean it was just hanging in the air.
It seems to be solid, but it was jumping and shaking like crazy. Big chunks of ice were falling off the face of it and down into the water.
That was six miles away and they still looked like big chunks. They came off the glacier like a big load of rocks spilling out of a dump truck.
That went on for a little while—it's hard to tell just how long—and then suddenly the glacier dropped back out of sight and there was a big wall of water going over the point.
The wave started for us right after that and I was too busy to tell what else was happening up there. Around five megatsunamis are believed to have occurred at Lituya Bay during a period of about years:  .
The mechanism giving rise to megatsunamis was analyzed for the Lituya Bay event in a study presented at the Tsunami Society in Although the earthquake which caused the megatsunami was very energetic and involved strong ground movements, several possible mechanisms were not likely or able to have caused the resulting megatsunami.
Neither water drainage from a lake, nor landslide, nor the force of the earthquake itself led to the megatsunami, although all of these may have contributed.
Instead, the megatsunami was caused by a massive and sudden impulsive impact when about 40 million cubic yards of rock several hundred meters above the bay was fractured from the side of the bay, by the earthquake, and fell "practically as a monolithic unit" down the almost vertical slope and into the bay.
The study concluded that: . The modeling reproduced the documented physical observations of runup. A subsequent analysis that examined the wider impact of the event found that the rockfall itself was inadequate to explain the resulting accounts and evidence.
The study concluded that, instead, a "dual slide" event was more likely — the rockfall, impacting very close to the head of the Lituya Glacier , caused around meters 1, feet of ice from the glacial toe to break off as shown in photographs from the time , and possibly injected considerable water under the glacier.
The glacier, lightened, rose before stabilizing in the water, and a large amount of trapped infill subglacial and proglacial sediment that was trapped under the glacier and had already been loosened by the earthquake was released as an almost immediate and many times larger second slide.
The debris released was estimated by the study as being between 5 and 10 times the volume of the initial rockfall, a bulking ratio comparable with that of other events such as the September Kolka-Karmadon rock ice slide estimated ratio between 5 and 10 , the November Parraguirre landslide est.
This additional volume would explain the large changes in the underwater shape of the sea floor in the bay, and the additional energy of waves, especially at the western end of the bay.
The paper's authors suggest that core samples may show a meter foot deep layer of reworked sediment if this model is correct.
From Wikipedia, the free encyclopedia. Redirected from Lituya Bay megatsunami. Main article: Lituya Bay. See also: Strike-slip tectonics. Play media.
Natural Hazards. National Centers for Environmental Information. Retrieved April 23, Earthquake History of the United States.
Publication Stories in the News. Ketchikan, Alaska. Retrieved April 22, Santa Cruz Sentinel. The International Journal of the Tsunami Society.
Retrieved February 11, Geological Survey Professional Papers.