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“The last time it ruptured was January 26, 1700 A.D., over 300 years ago. In all, 203,186 earthquakes are marked on the map, which is current through 2003. The largest transform fault earthquakes are about magnitude 8.5, whereas subduction zone [earthquakes] can be as large as magnitude 9.5.”Horton and his team look for signs of a big tsunami in the layers of shoreline mud and at the bottom of the deep sea. The speed that news travels has increased dramatically over the last 30 years, so we hear about more quakes. “Within the muds we find sand layers deposited by the tsunamis. “Cascadia is a really interesting story because there are no written records of a large earthquake there,” Horton says. By Thus the surface area for the fault slip can be much larger for subduction zone earthquakes than for transform faults and the corresponding magnitudes for subduction zone earthquakes can be much greater. “Thus we can’t reliably assess at this point whether the Cascadia subduction zone will eventually break mostly in a single giant earthquake or a series of large earthquakes.”He said more study of past Cascadia quakes and those elsewhere, along with analysis of the recent crop of great quakes, might lead to better predictions.One of the researchers scoping out Cascadia’s history of ancient earthquakes is Benjamin Horton, a professor in the department of marine and coastal science at Rutgers University.Horton has trenched and cored in the muds along the the coasts of British Columbia and the northwest United States looking for evidence of earthquakes big enough to trigger massive tsunamis. “The San Andreas Fault and other transform, or strike-slip, faults are very long but not very wide as they cut vertically through the earth’s brittle upper crust. smithsonianmag.com ... First & Last Name. And he’s found evidence of 12 major earthquakes over a 6,000-year period, an average recurrence interval of 500 years.
They discovered that while the frequency of magnitude 8.0 and higher earthquakes has been slightly elevated since 2004 – at a rate of about 1.2 to 1.4 earthquakes … The annual number of “great” earthquakes nearly tripled over the last decade, providing a reminder to Americans that unruptured faults like those in the northwest United States might be due for a Big One.Between 2004 and 2014, 18 earthquakes with magnitudes of 8.0 or more rattled subduction zones around the globe. The news and stories that matters, delivered weekday mornings.The destroyed village of Akkrapatti, about 300 miles south of Madras, India, is seen on Dec. 31, 2004, after being hit by a tsunami unleashed by a 9.0 earthquake off northern Sumatra, Indonesia. Number of Earthquakes by Year. “The average interval is every 500 years, but it can be much smaller.”Get breaking news alerts and special reports. That earthquake is thought to have "triggered" another quake in 2005, scientists say.The Cascadia subduction zone, stretching from British Columbia to Northern California. “This happened in Sumatra, where the great 2004 event activated the adjacent 2005 event, and those two activated a slightly more distant 2007 event,” he said.So what does that mean for the Cascadia subduction zone?“The offshore fault appears to be fully locked up by friction, with strain building up until the next large earthquake rupture releases it,” Lay says.But nobody can predict exactly when that might happen, or what it will be like.“The last 10 years have been interesting for seismologists because we have learned that great subduction zone earthquakes occur in many different ways and there do not seem to be any simple rules to predict the kind of behavior to expect,” says Peter Shearer, a professor of geophysics at the Institute of Geophysics and Planetary Physics at the Scripps Institution of Oceanography at the University of California, San Diego. Link to … And it reveals the story of plate tectonics itself.
“The last time it ruptured was January 26, 1700 A.D., over 300 years ago. In all, 203,186 earthquakes are marked on the map, which is current through 2003. The largest transform fault earthquakes are about magnitude 8.5, whereas subduction zone [earthquakes] can be as large as magnitude 9.5.”Horton and his team look for signs of a big tsunami in the layers of shoreline mud and at the bottom of the deep sea. The speed that news travels has increased dramatically over the last 30 years, so we hear about more quakes. “Within the muds we find sand layers deposited by the tsunamis. “Cascadia is a really interesting story because there are no written records of a large earthquake there,” Horton says. By Thus the surface area for the fault slip can be much larger for subduction zone earthquakes than for transform faults and the corresponding magnitudes for subduction zone earthquakes can be much greater. “Thus we can’t reliably assess at this point whether the Cascadia subduction zone will eventually break mostly in a single giant earthquake or a series of large earthquakes.”He said more study of past Cascadia quakes and those elsewhere, along with analysis of the recent crop of great quakes, might lead to better predictions.One of the researchers scoping out Cascadia’s history of ancient earthquakes is Benjamin Horton, a professor in the department of marine and coastal science at Rutgers University.Horton has trenched and cored in the muds along the the coasts of British Columbia and the northwest United States looking for evidence of earthquakes big enough to trigger massive tsunamis. “The San Andreas Fault and other transform, or strike-slip, faults are very long but not very wide as they cut vertically through the earth’s brittle upper crust. smithsonianmag.com ... First & Last Name. And he’s found evidence of 12 major earthquakes over a 6,000-year period, an average recurrence interval of 500 years.
They discovered that while the frequency of magnitude 8.0 and higher earthquakes has been slightly elevated since 2004 – at a rate of about 1.2 to 1.4 earthquakes … The annual number of “great” earthquakes nearly tripled over the last decade, providing a reminder to Americans that unruptured faults like those in the northwest United States might be due for a Big One.Between 2004 and 2014, 18 earthquakes with magnitudes of 8.0 or more rattled subduction zones around the globe. The news and stories that matters, delivered weekday mornings.The destroyed village of Akkrapatti, about 300 miles south of Madras, India, is seen on Dec. 31, 2004, after being hit by a tsunami unleashed by a 9.0 earthquake off northern Sumatra, Indonesia. Number of Earthquakes by Year. “The average interval is every 500 years, but it can be much smaller.”Get breaking news alerts and special reports. That earthquake is thought to have "triggered" another quake in 2005, scientists say.The Cascadia subduction zone, stretching from British Columbia to Northern California. “This happened in Sumatra, where the great 2004 event activated the adjacent 2005 event, and those two activated a slightly more distant 2007 event,” he said.So what does that mean for the Cascadia subduction zone?“The offshore fault appears to be fully locked up by friction, with strain building up until the next large earthquake rupture releases it,” Lay says.But nobody can predict exactly when that might happen, or what it will be like.“The last 10 years have been interesting for seismologists because we have learned that great subduction zone earthquakes occur in many different ways and there do not seem to be any simple rules to predict the kind of behavior to expect,” says Peter Shearer, a professor of geophysics at the Institute of Geophysics and Planetary Physics at the Scripps Institution of Oceanography at the University of California, San Diego. Link to … And it reveals the story of plate tectonics itself.