A team of scientists is working to obtain sharp images taken from the Cassadia subduction zone – a fault line that runs seven hundred miles off the Pacific Northwest coast.
The subduction zone, which was the site of some of the largest earthquakes in North America and past “megathrust” earthquakes in the world, was strangely quiet, with almost no seismic activity detected.
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Cassadia is part of Oregon and British Columbia and to find the cause of the disappearance, researchers – including students – from the Geophysics Institute at the University of Texas, Woods Hole Oceanographic Institution, University of Washington, Oregon State University and the National Oceanic and Atmospheric Administration R / V Marcus G. Langseth of Columbia University is up for grabs for this week-long campaign funded.
Science technicians are also present to operate the seismic equipment as well as assist marine mammal observers and Langsheth officers and crews.
“During our cruise, we were looking for a megathrust fault a few kilometers below the bottom of the ocean floor that covered the sloping Juan de Fucha plate,” Professor Susan Carbo, a researcher at Columbia’s Bruce C. Heisen / Lamont, wrote in a Tuesday post.
“Our survey will be the first seismic imaging study to cover almost the entire Casadia subduction zone. We will use modern advanced seismic imaging technology to identify and identify fine-scale structures within the subduction zone for a wide range of scientific questions. Related to risk, ”he added.
Corbot further explained in an email to Fox News that the key question was: “Where is the ‘big’ made megastrust fault buried deep under the sediment in Cassadia?”
“Since the fault zone is so seismically quiet, we do not have a true picture of where the fault that caused our great earthquake is. We have recorded many small earthquakes with megastrust faults in other subduction zones so that scientists can identify the fault and study its properties.” “He said. “But not in Casadia.”
According to ScienceMag, Langset will use ultrasound technology to emit sound pulses from a sound source enclosed in the back of a ship to create detailed images of subterfaces.
In addition, the team will use hydrophone microphones and hundreds of other receivers on the sea floor and on the ground to record echoes and reflections from faults.
“The detailed dimensions of the images we can achieve with this technology cannot be achieved in any other way and there is a complete host that can only be achieved with the high resolution of the surface structure and features obtained,” Carbotti said on Thursday.
Moreover, he mentioned in the post that Cascadia’s silence was meant to “completely lock” the fault, indicating the possibility of Cassadia megakok.
“Scientists believe that the lack of earthquakes is currently a reflection of the ‘locked’ state of the megathrust fault, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly, quietly.” Will be given, ”he wrote.
In addition to identifying the error, Cabot said the information the team is gaining will be used to “identify fault zone properties that will help us better understand where and why some parts are slowly being cropped.”
Other parts may be present in a completely blocked state at risk of catastrophic eruptions, Carbot told Fox News that “this type of information is needed to better limit the risk of earthquakes and tsunamis.”
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Scientists hope the expedition will help gain more insight into how far the cracks could reach in the future, if they could be responsible for sediments collapsing during an earthquake, and how airgun waves could travel faster and get closer to the surface. Sediment – especially effective for improving early warning.
Science Mag said that the movement occupied by GPS stations is reassuring, part of the fault is revealing “creeping” and stress and there is evidence that many large earthquakes have not broken the whole fault, but the question of when the next “big” will be will be a “strike” .