Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Magnetic Storms And Earthquakes

22.03.2002


For years scientists have been studying the impact of different geophysical fields on the earthquakes occurrence. It has been assumed that the fields, generated due to the solar activity, earth flows fluctuations, the Earth`s speed of rotation and even the launch of magnetohydrodynamic generators affect the strained state of the earth`s crust, these fields `pumping` additional energy into the crust. Normally the aroused earthquakes are recorded several days after the provoking key event.



Specialists from the Shmidt United Institute for Physics of the Earth, Russian Academy of Sciences, assume that magnetic storms are also powerful enough to quake the earth`s crust. To verify the hypothesis, the researchers compared more than 14,000 earth`s crust vibrations of sufficient power recorded since 1975 in Kazakhstan and Kirgizia, and approximately 350 sudden magnetic storms recorded within the same period by the world geomagnetic observations network.

Geomagnetic storms usually arise due to the high-speed plasma streams ejection on the Sun which accompany the solar flares activity. The air-blast produced by the high-speed plasma streams ejection hits the Earth magnetosphere causing the vibrations. The beginning of the storm which lasts from several hours to several days can be sensed almost simultaneously all over the Earth. Then the storm is replaced by a longer recovery stage, when the Earth magnetic field is gradually restored. At this stage the magnetic field characteristics vary considerably in different latitudes.


The calculations have proved that the greatest number of earthquakes in Kazakhstan and Kirghizia occurs within a several-day period after the beginning of the magnetic storm. Normally the number of earthquakes increases noticeably after a magnetic storm takes place. Nevertheless, in some areas the opposite regularity has been observed. In order to account for other factors (possibly of no less importance), the scientists have tried to trace a connection between the above earthquakes and the tidal fluctuations. However, according to the statistical analysis the tidal fluctuations, unlike geomagnetic storms, have no impact on the earthquakes.

The scientists have also tried to estimate whether the magnetic storm energy is sufficient to provoke an earthquake. In general, the seismic activity releases the energy amount comparable with that carried over by the magnetic storm. However, an earth shock consumes only the hundredth part of the involved resilient energy which triggers the process. Besides, the electromagnetic energy of the storm is being converted into mechanical one through complicated effects in the rocks, for instance piezoelectric effect. The efficiency factor of this conversion makes as little as the hundredth parts of a percent. Therefore, the scientists tend to believe that the magnetic storm acts as the earthquake trigger. The geophysics hope to understand better the physical nature of the trigger effect in the course of the future fieldwork and laboratory experiments.

Tatiana Pitchugina | alphagalileo

More articles from Earth Sciences:

nachricht Colorado River's connection with the ocean was a punctuated affair
16.11.2017 | University of Oregon

nachricht Researchers create largest, longest multiphysics earthquake simulation to date
14.11.2017 | Gauss Centre for Supercomputing

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>