Chart A displayed in the previous posting has already been updated several times today as new EM Signals were detected. And it is due for another update later tonight or early tomorrow.

Unusually large number of low intensity EM Signals have been detected during the past few days or so. They have duration times of about 0.25 to 0.5 seconds versus 5 to 30 seconds for the high intensity signals such as the three that were recently detected.

Large number of low intensity signals like that might be compared with slowly bending a fairly dry tree twig. It usually doesn’t break all at once. Instead there is an almost continuous stream of low intensity snapping sounds as individual fibers in the twig snap.

It is possible that these large volumes of low intensity signals represent something similar for fault zones. Small sections of the fault in the area where the main earthquake will take place are placed under so much pressure that they start to fracture one at a time. That then slowly releases some pressure in that area but also helps transfer it to the main area of the fault where it starts to quickly build. And when it reaches the breaking point the main section and any attached sections that are also under pressure snap all at once. And the tremendous amount of stored energy in the fault zone is abruptly released in the form of an earthquake.

With the higher intensity signals that last up to 30 seconds versus the 0.25 second low intensity signals, the fault zone might not be experiencing those small fractures. Instead, the rock layers themselves are undergoing physical changes that result in their temporarily taking on a more plastic character rather than their usual brittle and rigid character. And their conductivity changes. They become more like conductors of electricity rather than resistors. EM Signals can be generated by rock layers in the fault zone. And the fault zone can start to interact with external energy fields such as the Earth’s geomagnetic energy field resulting in those signals being circulated around the world.

Ear Tones that people report hearing before earthquakes could be one manifestation of those high intensity signals. However for earthquake forecasting I myself usually evaluate them as low intensity signals.

One curious thing about these signals is the fact that they are almost never detected at the actual earthquake time. I can remember that happening only once in the past few years with a Mediterranean Sea area earthquake.

These are all theories that are being considered. Exactly how the various EM Signals are being generated is still unknown.