An inland magnitude 6.9 earthquake in 1995 in a similar geological setting beneath Kobe, Japan caused in excess of $200 billion damage.At 9 P.M. on January 26, 1700 one of the world’s largest earthquakes occurred along the west coast of North America. When he returned to his country he found that a powerful tsunami, of the kind that would be triggered by an earthquake of magnitude 9 or more, had struck Honshu, Japan’s main island, exactly three hundred years ago and that it came from this part of North America. Japan, being an older civilization, has records of earthquakes and tsunamis going back many hundreds of years. If a conduit permits any of this magma to break out on to the surface we have a volcanic eruption.The Cascade Range is a series of stratovolcanoes; that is to say, volcanic mountains that are conical in shape because of the nature of the lava that built them over the past thousands of years. The undersea Cascadia thrust fault ruptured along a 1000 km length, from mid Vancouver Island to northern California in a great earthquake, producing tremendous shaking and a huge tsunami that swept across the Pacific. Given the frequency of smaller earthquakes in and around Seattle, there is every justification for concentrated research efforts while, at the same time, keeping a close watch on the mountain’s behavior.We now know that a similar offshore event will happen sometime in the future and that it represents a considerable hazard to those who live in southwest British Columbia. The initial response from geologists was that there was no record of big earthquakes in this area so a nuclear power plant would not be in danger, but the question that had been asked stimulated new questions that no one had previously asked. It was an explosion that was probably ten times greater than the one that occurred later in Mount St. Helens.
Debris flows like this one give a great deal of concern to surrounding settlements. At 9PM on January 26, 1700 one of the world's largest earthquakes occurred along the west coast of North America.
Water went as far as the pine trees and returned to the ocean very fast. The Cascadia Fault is the boundary between two of the earth’s tectonic plates: the smaller offshore Juan de Fuca Plate, formerly the Pacific Plate before the North American Plate had overtaken it, now the one that is sliding under the much larger North American Plate.
I used the term debris flows in relation to these because the release of water triggers small landslides and picks up sediment on the way down.
The undersea Cascadia thrust fault ruptured along a six-hundred-mile length, from mid-Vancouver Island to northern California in a great earthquake, producing tremendous shaking and a huge tsunami that swept across the Pacific.
These mountains are located approximately 170 miles from the coast. A wall of water swept over the whole coastal area, destroying everything in its path. At 9PM on January 26, 1700 one of the world's largest earthquakes occurred along the west coast of North America. The answer lay in a series of events that began in the mid-1980s.A nuclear power plant was being installed south of Seattle in the 1980s and the nuclear regulatory authorities wanted to know if there were any seismic concerns that ought to be taken into consideration. As researchers moved farther and farther back from the coast, looking carefully at each location where layers of mud and peat were found, a very fine layer of sand on the peat seemed to become thinner and thinner the further you were from the coast. The empty caldera then filled with water to form the place we know as Crater Lake. The recognition of definitive signatures in the geological record tells us the January 26, 1700 event was not a unique event, but has repeated many times at irregular intervals of hundreds of years. An ocean data buoy is alerting to an “event” in the Cascadia Subduction Zone off the west coast of Oregon. During the 1990s, Mount Rainier was selected by the United States Geological Service for intense study as one of three places that might cause major damage over the next decade or two. It was obvious that this part of the coast had once been below high water, then above it, and then below it again before coming to its present state with topsoil in the uppermost eight inches. Seawater was known to have covered land as if it had been high tide. Geological evidence indicates that thirteen great earthquakes have occurred in the last 6,000 years. The Cascadia fault is the boundary between two of the earth’s tectonic plates: the smaller offshore Juan de Fuca Plate that is sliding under the much larger North American Plate.The shaking of the earthquake collapsed houses of the Cowichan people on Vancouver Island and caused numerous landslides. Glacier Peak is a volcanic mountain very similar to Mount Baker. To emphasize the urgency of this study, it was pointed out that a fault line, known as the Seattle Fault, runs from a point near Mount Rainier to Seattle. The earthquake also left unmistakable signatures in the geological record as the outer coastal regions subsided and drowned coastal marshlands and forests that were subsequently covered with younger sediments.
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