Hi Roger,

I'll tell you what I think the sound is that we hear as ear tones. I believe it is an electric signal caused by very large rocks breaking in earthquake faults.

The reason I say that is because when rocks are broken in a lab they found they do emit an electrical discharge. So imagine something on a massive scale. It would hard to believe that electrical discharge could not be heard, especially as it is traveling up and down faults.

I like the KISS principle: Keep it simple stupid. (not you, just thoughts) You see everyone seems to want to make ear tones a complex problem that cannot be solved, but I think it is so simple we overlook the obvious. We have a known thing that happens in labs with rocks, so why not much larger rocks in earthquake faults?

The only real question is to understand at what frequency this sound can be recorded. Once discovered I don't think this what seems so large problem could not be solved.

What I find fascinating is that people from around the world hear it and some know what it is and others hear it and never make the connection. But there are enough people who know this to say it is real.

There are a lot of ways to look at this monitoring. First of all you don't have to be near a fault to hear it, so perhaps the equipment doesn't need to be either. And we have to ask, does each fault have its own personal signature sound? I think they do. Each one is special an unique. That's why we can memorize the sounds and know where they come from with just a few hearings.

Petra