We can foresee these events in advance from the following signs:
when in a sign we find the conjunction of three or four planets, like Saturn, Jupiter and Mars or Mars and Venus and Saturn and even Mercury and when they are in their own places or triplicities or exaltations and one of two of them are stationary or in heliacal or vespertine rising or when both boreal or austral, or when they change the signs each others so one is the other’s domicile.
This is stronger when the Nodes are in signs signifying quakes, like the preceding parts of Taurus, and Pleiades, northern parts of Twins, the starting ones of Cancer, the end of the Scorpio and his third facie and the first facie of Aquarius and the first of Pisces.
According Ancients it is difficult inquiring about earthquakes and their causes.
It is told that an earthquake is signified by a malefic star in the zodiacal places most proper to sufferings.
Saturn. When transiting in Taurus it produces earthquakes in som places, especially the ones under Taurus. The same Saturn in Gemini, in his boreal parts, in Cancer, in Scorpio: in the third facie of Scorpio if it is in heliacal phase, it signifies the arrival of a Earthquake.
Mars. In Taurus, in the middle of the sign, rouses earthquakes. In Gemini, boreal parts. In Cancer, in heliacl phase in the first facie.
Moon. In Scorpio, in the first facie, sometimes means earthquakes. Generally eclipses of Sun and Moon at IC often produce earthquakes and in the front part of the dodekatemorios of Taurus, with the Pleiades, if there is no benefic planet beholds them, the rear parts of Gemini and the last of Scorpio.
Mercury when is the ruler, is cause of earthquakes according its condition.