Researchers of the Institute of Ecological Problems of the North, Ural Branch, Russian Academy of Sciences, and the Schmidt Institute of Physics of Earth, Russian Academy of Sciences, have developed technology that allows to register nanoearthquakes - seismic events of minimal possible magnitudes (-4, -5). Registration of such events allows to quickly and accurately make up seismic activity maps of small-scale territories.
Investigation of seismic activity in quiet areas (including revelation and assessment of degree of fracture activity) is of great practical importance. People are laying pipelines, building nuclear power-stations, radioactive waste storages and other potentially dangerous constructions, including tower buildings. However, the earth is vibrating from time to time even in the quietest areas. Certainly, typical shaking of the earth in the middle of the platform is much weaker than that in active regions, but it can also cause trouble if minifracture happens to go under a nuclear power plant. Nanoearthquakes can serve the indicator of seismic well-being in a certain area, but observations over nanoearthquakes require special technology.
Seismic activity of the territory is judged by the earthquake recurrence diagram. In a double logarithmic scale, the diagram represents a straight line, the slope of which characterized seismic activity. The diagram is drawn up based on observation results. Strong earthquakes are the easiest to register but they have to be awaited for a long time. To obtain reliable information about weaker and more frequent quakes, which slightly exceed the noise level and occur 10 to 20 times within half an hour, the researchers have to spend several days per each spot. Only three hours are needed to measure the most feeble events, but they are difficult to be distinguished from disturbances caused by the wash, transport motion or the life of a big settlemen. Besides, existence of such feeble vibrations was assumed only theoretically. However, Russian geophysicists have managed to record them.
Sergey Komarov | alfa
Global study of world's beaches shows threat to protected areas
19.07.2018 | NASA/Goddard Space Flight Center
NSF-supported researchers to present new results on hurricanes and other extreme events
19.07.2018 | National Science Foundation
A new manufacturing technique uses a process similar to newspaper printing to form smoother and more flexible metals for making ultrafast electronic devices.
The low-cost process, developed by Purdue University researchers, combines tools already used in industry for manufacturing metals on a large scale, but uses...
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
20.07.2018 | Power and Electrical Engineering
20.07.2018 | Information Technology
20.07.2018 | Materials Sciences