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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