Regular contributor M.A. Vukcevic has kindly given permission to reproduce some ongoing research which will be of interest to people learning about earthquakes and their precursor indicators. Vukcevic states:
“the tb’s talkshop does not take any responsibility either for statements or data presented.
Please note that there are number of the geomag parameters which I have not labelled, in case I decide they are no longer relevant, or if pattern does hold for some time I might be able to publish results.”
EARTHQUAKES AND GEOMAGNETIC STORMS
This is an ongoing ‘live’ project (started on 02/03/2011, prompted by the N. Zealand earthquake) to establish if there is a link between the geomagnetic activity (magnetic storms) and acceleration of the earthquake’s occurrence. It is not claimed that geomagnetic storm is a primary cause of any earthquake. However if conditions for an earthquake are ‘ripe’, then solar storm could be a trigger (not the cause) for it, and bring it forward for few hours or days.
There is strong evidence of electromagnetic processes responsible for earthquake triggering, that we study extensively. We will focus here on one correlation between power in solar wind compressional fluctuations and power in magnetospheric pulsations and ground H component fluctuations. The variation of the horizontal component H of the geomagnetic field is the crucial parameter in the Magneto-Seismic Effect MSE to be discussed in a companion paper. The connection of earthquake activity to possible solar or solar wind drivers is not well understood; many authors have attempted correlations in the past with mixed results. Geophysical Research Abstracts,Vol.8,01705, 2006;Lab for Solar and Space Physics, NASA Goddard Space Flight Center,Greenbelt, MD http://www.cosis.net/abstracts/EGU06/01705/EGU06-J-01705.pdf
Scientists have been tracking and studying substorms for more than a century, yet these phenomena remained mostly unknown until THEMIS went into action. Even more impressive was the substorm’s power. Angelopoulos estimates the total energy of the two-hour event at five hundred thousand billion ( 5 x 10^14 ) Joules. That’s approximately equivalent to the energy of a magnitude 5.5 earthquake http://science.nasa.gov/science-news/science-at-nasa/2007/11dec_themis/
It is likely that in the electrical terms any tectonic fault is also the weakest point. Geomagnetic storm of 10-11 March coinciding with the Japan’s mega-quake lasted nearly 24 hours.
Click graphs for full size images
14 – 16/03/2011. Calm , no major geomagnetic disturbances.
12 & 13/03/2011 hundreds of aftershocks NEAR THE EAST COAST OF HONSHU, JAPAN. Surge of quakes in GULF OF CALIFORNIA
More charts can be found here: Graphs and Formulae
© m.a. vukcevic