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The relations between sunspot numbers and earthquakes (M≧6), solar 10.7 cm radio flux and earthquakes, solar proton events and earthquakes have been analyzed in this paper. It has been found that:
(1) Earthquakes occur frequently around the minimum years of solar activity. Generally, the earthquake activities are relatively less during the peak value years of solar activity, some say, around the period when magnetic polarity in the solar polar regions is reversed.
(2) the earthquake frequency in the minimum period of solar activity is closely related to the maximum annual means of sunspot numbers, the maximum annual means of solar 10.7 cm radio flux and solar proton events of a whole solar cycle, and the relation between earthquake and solar proton events is closer than others.
(3) As judged by above interrelationship, the period from 1995 to 1997 will be the years while earthquake activities are frequent. In the paper, the simple physical discussion has been carried out.
Received: 4 July 1997 Revised: 25 November 1997 Accepted: 25 November 1997
Earth has a diameter of approximately 12,756 km (7,972 mi). The Earth's interior consists of rock and metal. It is made up of four main layers:
1) the inner core: a solid metal core made up of nickel and iron (2440 km diameter)
2) the outer core: a liquid molten core of nickel and iron
3) the mantle: dense and mostly solid silicate rock
4) the crust: thin silicate rock material
The movement of material deep within the Earth may cause large plates made of the crust and upper mantle, called the lithospheric plates, to move slowly over the Earth’s surface. It is also possible that these currents generate the Earth's magnetic field, called the magnetosphere.
The Earth has a magnetic field with north and south poles. The magnetic field of the Earth is enclosed in a region surrounding the Earth called the magnetosphere. As the Earth rotates, its hot core generates strong electric currents that produce the magnetic field. This field reaches 36,000 miles into space. The magnetosphere prevents most of the particles from the sun, carried in solar wind, from impacting the Earth. The solar wind distorts the shape of the magnetosphere by compressing it at the front and causing a long tail to form on the side away from the Sun. This long tail is called the magnetotail.
The Sun and other planets have magnetospheres, but the Earth has the strongest one of all the rocky planets. The Earth's north and south magnetic poles reverse at irregular intervals of hundreds of thousands of years. In addition, the poles wander over shorter periods of time (hundreds of years).
In the past 15 million years scientists found pole shifts occurred four times every 1 million years. Though this averages out to once every 250,000 years, switches do not occur at regular intervals. During one period in the Cretaceous, polarity remained constant for as long as 30 million years, though this is believed to be an anomaly. The last pole shift took place 790,000 years ago; causing some scientists to believe we're due, while others speculate a reversal is already underway.
Spectral analysis of time series of the earthquakes was carried out by the method of maximum entropy, using filters the lengths of which was selected taking into account the necessity of studying of high-frequency spectrum component (with T≤30). The results of studying of spectral particularities of time series of the earthquakes with M ≥7 showed, that the major part of the harmonics in the spectra of earthquakes and Wolf number coincides. Picture 8 shows that character harmonics in spectra are T=18-22 years, 10-11 years and 8 years. It should be noted, that in the spectrum, that covers time series of the earthquakes from 1600 to 2000, the indicated harmonics were detected more accurate, than of the same for the period of 1902-2000. According to our explanation that occurs because of specificity of the method applied, the effectiveness of which increases when increasing the lengths of original row. As you see from the shown spectra, the 11-year and 22-year cyclicity is appears more accurate.
When it is considered that the aftershocks are also included in the number of earthquakes which have been taken into the comparison, in the area within the given coordinates, there is no finding that shows that the earthquakes occur as a result of a triggering under the effect of geomagnetic storm. In order to mention such a finding, more number of earthquakes should occur with percentages that correspond to geomagnetic storms. This is not verified by the results.
I mentioned in the previous thread we were talking about this, that other planets and the moon definitely have effects as well (however minute).