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October 30, 2012 came to the east coast of America powerful tropical cyclone, which entailed a lot of destruction and human sacrifices. But a hurricane can cause not only terrestrial disasters, because of the “Sandy” began to vibrate the earth’s crust. Despite the fact that the main damage occurred exclusively on the eastern part of the continent, vibrations went through to the western coasts where seismometers could detect them. Scientists are studying instrument readings to track the fate of the storm, and find out if climate change could affect total number of natural disasters in the oceans in recent decades. University of Utah Seismologist Oner Sufri says that vibrations in the earth’s crust could be detected long before Sandy hit the cities of America. Some movements of the cortex are due to the fact that the waves hit about breakwaters, but most of the vibrations are consequences of mutual collisions of seismic waves. At the annual meeting of seismologists America’s Salt Lake City (Seismological Society of America) Safari made a report in which he said that the most powerful shocks were spotted exactly at the moment when the “Sandy” turned towards the shore, on northeast of new jersey. He and his colleague Keith Koper (Keith Koper) analyzed data from a network of seismometers located on US territory, from October 18 to November 4, 2012. It is worth noting that in this time interval there were two significant shocks of magnitude from 2 to 3 points on the Richter scale. Koper explains: “These are not earthquakes, these are seismic waves. They can form for completely different reasons. For example, vibration of the earth’s crust we observed after the fall of Chelyabinsk meteorite. “In 2005, when it hit the most devastating hurricane in US history Katrina, California seismometers also spotted vibrations of the earth’s crust. And even if the storm passes far from the shore, somewhere in the middle of the ocean, the vibrations caused by it are still enough powerful so that they can be detected by devices. Shocks like this are stronger all felt at the scene of the storm. Thanks to this, scientists can trace where it will move and where it will hit harder total, relying only on seismological data. This study enables geologists to take a fresh look at data on already past hurricanes. It’s especially interesting to analyze the information collected by ground-based instruments at a time when satellites were not yet It was. Another seismologist, Daniel McNamara, explains: “Vibrations of the earth’s crust caused by hurricanes are usually low-frequency and not like those that happen due to earthquakes. We used to believed that this is a seismic noise, and did not pay attention to it. But now it’s become clear that these microscopic vibrations are worthy close scrutiny. “Such unrest can be used to in order to compose a general picture of the vibrations of the earth’s crust and mantle. In the future, this will simplify the prediction of natural disasters. IN Scientists also expressed their hope that the current discovery will help in the study of large structures in the earth’s crust and mantle. For of this they suggest using the same mathematical technologies used in computed tomography scanners scan of the human body. (In this case, you can hold the analogy between seismic waves that travel across Earth and in all directions, and X-rays between seismometers and computed tomographs.) Because seismic the waves are very long, with their help you can capture only large structures – from ten kilometers wide and more. Such to for example, the size of deep tectonic plates ocean troughs and “heading” to the earth’s core. Mantle plumes – bubbles of hot matter floating up from the bowels of the planet on the joints of plates that determine volcanic activity, also could be detected using seismic waves. The study seismic activity data over recent decades will help researchers understand what and how exactly affects the appearance and the movement of storms and hurricanes and how climate change provoke the appearance of seismic waves. Of course, most scientists get information through satellites, but sometimes they give a failure. Therefore, the availability of seismograph data can significantly simplify the work, as well as increase the amount of information that researchers have.
US earthquakes
