Hi All,

I was looking for some information the other day and happened across this link on ELF & ULF in regard to predicting earthquakes.

For a very long time, I have contended that an earthquake process occurs before actual earthquakes and I believe that is the source of ear tones. It also explains why some ear tones do not have resulting, immediate earthquake matches. Apparently ELF and ULF monitoring may be able detect such occurrences.

This site has a plethora of information and I hope most will take some time to read it. The paragraph in the first page which caught my interest, I am posting first, out of context, which I hope will not be to confusing....Petra

"My theory about how these ULF and ELF signals arise is as follows. Before an earthquake, microfractures form in the earth and these microfractures migrate outward from the initial fracturing. The microfractures allow groundwater to seep into the rocks. Water under pressure will be pushed along these cracks and also through the pores of the rocks. Microfracturing also releases ions into the water. Now you have an electrolyte being pushed through the pores and cracks in the rocks. When that happens, an effect called the streaming potential, or electrokinetic effect, is produced."

OE Reports 164 - August 1997
An interview with Jack Dea, Naval Command, Control and Ocean Surveillance Center

ULF/ELF observations "predict" earthquakes

Can you give us some background?

Originally, my intent was to study low frequency signatures from the ionosphere. One day, in April of 1990, I found that the signals were way up. I didn't understand. The following day the signatures just stayed up there. Then about 3:00 in the afternoon, I heard on the radio that we had had a 4.8 earthquake in Upland, which is about 100 miles north of here. Later that afternoon, the signal slowly went away. By the next day, everything was back to normal.
This is strange, I thought. So, I studied more data and found more correlations between the signals and the advent of the earthquake. I then learned about Tony Fraser-Smith's, of Stanford's Star Laboratory, observations preceding the Loma Prieta earthquake, which was the big earthquake near San Francisco in October 1989.
That was before I started my observations of the ionosphere. I started observing several months before the Upland earthquake of April 1990. I learned that Fraser-Smith had observed big signals, even bigger than mine, 3 weeks before the Loma Prieta earthquake. It was very convincing data. After the earthquake, the high signal levels slowly went away.

• OE Report/Interview