How an earthquake is caused?

How an  earthquake is caused?

Earthquake is caused when Rahu transits over the natal planets of the country, when  the  country  gets independence.

At  that time earth is transitting near the Rahu or Ketu.  The ascendant of Iran is Cancer.  Retrograde Saturn in Leo -  aspects its fourth house which represents the land of the country.  The degree of Saturn is 14.43 and degree of Rahu is 23.41.  The degree of Venus is 10.23 and it is associated with Ketu.  As such Rahu should  touch the degree of Saturn or Venus or Rahu.

There was an earthquake  on 31.3.2006 in Iran.  A phenomena of earthquake occurs for a period of 45 days.  Any planet which is closer to earth should influence the 4^th house of the country.  In the 4^th house Jupiter is very close to the earth.   Earth was passing the node at that time.  

Venus shifted to Aquarius and it was aspected by Jupiter 23.52.  The degree of natal Rahu is 23.41, Natal Ketu 23.41 aspected transit Jupiter 23.52 which was closer to the earth.  The gravitational pull on the earth is maximum when it is closest to the earth.  It causes the earth to shake.

Two malefic planets Rahu and Saturn were posited in the 4^th house.  Saturn gravitational pull is very high as it is closer to the earth.  The degree of transit Rahu is 22.41. The earthquake occurred on 16.4.2013.