Kamchatka deep earthquake was the most powerful in the history of

September 20, 2013. Seismologists from the University of California found that 8.3-magnitude earthquake in the Sea of Okhotsk, occurred on May 24 of this year, was the most powerful of all known deep earthquakes. Research published papers Science, its summary can be read on the University website.

Scientists have found that seismic activity hypocenter was at a depth of 609 kilometers under the shelf of the Sea of Okhotsk. Earthquake, so no doubt be attributed to a poorly-studied class of deep, although the velocity of the fault, and some other indication it was "very similar to the surface of the earthquake."

During the movement of plates formed fracture length of 180 km. The speed of its spread was about 4-4.5 kilometers per second, and the plates themselves have moved relative to each other by a distance of 2 to 10 meters. The energy of the earthquake is estimated by scientists at 5? 1017 joules, which is 30 percent more than the next more powerful earthquake in Bolivia, which occurred in 1994.

Deep earthquakes are very different from conventional surface. Walking through the thick crust, deep tremors usually lose energy and do not cause significant damage to the surface. The reasons for their occurrence is now very little is known. According to Ruben Tatevosian, chief researcher of the Institute of Physics of the Earth, "the mechanism of" deep "earthquakes — it is dark and it's a little understandable, but the fact that they arise — that's a fact."

According to one hypothesis, in the course of deep earthquakes is a phase transition between the minerals in the earth's crust. Laboratory modeling of the process, which was published in the same issue Science, that analysis of Okhotsk earthquakes, indirectly confirms this hypothesis: in the course of the phase transition in olivine there are characteristic for deep earthquakes acoustic waves.

Source: Lenta.ru,

 

Was there an earthquake in the Sea of Okhotsk classic earthquake?

September 20, 2013. All reputable seismic services has long confirmed the fact that in the Sea of Okhotsk was the strongest in the history of observation wobble in the Earth surface with magnitude 8.3. However, the reasons for its occurrence and other features of the event so far shrouded in mystery. The open question is, how likely the recurrence of such an earthquake at a shallow depth, and what the consequences might be.

The impetus was generated in the deep layers of the Earth's mantle May 24, 2013. All signs of the earthquake, which arose under the cliffs up to 609 km, is matched with conventional seismic episodes that have less depth epicenter. But until now, scientists are finding difficult to imagine how such a powerful activity could come under tremendous pressure as the Pacific plate on the Earth's mantle.

As a result of guesswork hypothesis that the deep fault in the place could get liquefied carbon dioxide, which served as a lubricant for the rock to slide and spawned shaking. The weak point of this assumption is the depth to which was leaked gas or liquid. In the case of Okhotsk is unlikely, unless it is some type of an unidentified liquid.

The second hypothesis concerns the changes that may undergo portion of the lithospheric plates. Perhaps it was the epicenter of the earthquake rocks through a stage of mineral transformation under the influence of excessive pressure, causing vibrations, similar to the seismic activity. A similar process occurs with the mineral olivine, when he was under pressure enters the mineral spinel, which is always accompanied by a shake of the original rock.

Now we can only conclude that a rough analog of the events in Russia there was an earthquake in 1994 in Bolivia, but then free up a lot less energy and fewer people feel the push. In the case of Okhotsk earthquake, even the western regions of Russia have witnessed the shaking of varying strength, and all because of the shock wave propagation speed was impressive (14 400 km / h).

Source: EcoWars.tv

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