 |
| Titel |
Rethinking the problem of ionosphere-lithosphere coupling |
| VerfasserIn |
Yuri Ruzhin, Victor Novikov |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100311
|
| Publikation (Nr.) |
 EGU/EGU2014-16228.pdf |
|
|
|
|
|
| Zusammenfassung |
| An overview of research of possible relations between variations of geomagnetic field and
seismicity is presented, including Sq-variations and geomagnetic storms. There are many
papers demonstrating positive correlations between geomagnetic field variations and
subsequent earthquake occurrence that allows to authors to talk about earthquake triggering
impact provided by ionospheric processes on lithosphere. Nevertheless, there is another
opinion on negligible impact of geomagnetic disturbances on the earthquake source
supported by statistical analysis of correlation between variations of geomagnetic field and
global and regional seismicity. Mainly, the both points of view on this problem are based on
statistical research without detailed consideration of possible physical mechanisms which
may be involved into the supposed earthquake triggering, or very rough estimations of
possible increase of stresses in the faults under critical (near to failure) state were
made. Recently it was shown that the fluids may play very important role in the
electromagnetic earthquake triggering, and the secondary triggering mechanism should be
considered when the fluid migrating into the fault under electromagnetic action may
provide fault weakening up to earthquake triggering threshold. At the same time,
depending on fault orientation, local hydrological structure of the crust around
the fault, location of fluid reservoirs, etc. it may be possible that fluid migration
from the fault may provide the fault strengthening, and in this case the impact of
variation of geomagnetic field may provide an opposite effect. In so doing, it is
useless to apply only statistical approach for the problem of ionosphere-lithosphere
coupling, and in each case the possible behavior of fluids should be considered under
electromagnetic impact on lithosphere. Experimental results supporting this idea and
obtained at the spring-block model simulating the seismic cycle (slow accumulation and
sharp drop of stresses in the fault gauge), as well as field observations of water level
variations in the well during ionospheric disturbances are presented and discussed. |
|
|
|
|
|
|