Earthquake Precursors Pattern

 

The pattern of earthquake precursors could be described as “pre-earthquake signature” since every reoccurrence maintains common characteristics.

Observing the recorded signal, one realizes that, throughout the spectrum 1-40Hz, there are lines almost parallel to each other at any given time. Any spectral line differs 1-3Hz from the previous one.

The duration of the “pre-earthquake signature” varies from 15 minutes up to 3 hours, while for the specific spectral impressions, the intensity of the magnetic field varies from 2 PT to ~20 PT.

It is most likely that the common characteristics of the signal will still appear in frequencies higher than 40 Hz.  Further observation is required in order to verify the following:

 

  1. What is the co-relation of the magnetic field intensity and the duration of the “pre-earthquake signature” with the data of the earthquake to follow?
  2. What is the highest frequency in which the “pre-earthquake signature” is observed, as well as the co-relation of the frequency with the earthquake magnitude or the distance from the epicenter to the reception device?