PSN-L Email List Message

Subject: Near and Far Field of an EQ
From: "Geoffrey" gmvoeth@...........
Date: Tue, 3 Mar 2009 07:37:01 -0700

Hello folks at PSN;

can any of you gurus tell me if eqs have a near and far field
like a transmitting antenna might.

With an antenna most of the energy collapses back into the antenna
itself. Only a fraction actually escapes into the universe as radio waves.

You must be like 10 wavelengths from the antenna to measure the radiated energy.

I think possibly this true of earthquakes too.

Like one must be 40 or more miles from the event to really measure its radiated energy output ?

Any thoughts ?


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