Science Vol. 283 15 Jan 1999 p. 321 reports a new hypothesis for the whole-Earth ringing (oscillation) with periods of 3 to 8 minutes detected last year by seismologists. Seismologist Naoki Suda noted that hum was strongest from noon to 8:00 p.m. Greenwich time and weakest from midnight to 6:00 a.m., which correlates with the pattern of activity followed by the sum of the world's thunderstorms (mainly from storms over Africa and southeast Asia). Suda hypothesizes that turbulent winds of thunderstorms striking the surface are setting up the seismic hum. This raises the question of a possible relation to hum perceived by humans. Possibilities that occur to me: audible harmonics of these seismic frequencies (.008 to .002 Hz) or energy coupled from ringing to terrestrial structures that then vibrate in an audible range. *********************************************************** EWAR-L Electronic Warfare Mailing List To unsubscribe or subscribe: send a message to [EMAIL PROTECTED] with the following text: unsubscribe EWAR-L or subscribe EWAR-L. To post messages, send to: <[EMAIL PROTECTED]>. Previous posts: <http://www.sonic.net/~west/ewar/digest.htm>. EWAR Web site: <http://www.sonic.net/~west/ewar/ewar.htm>. -Wes Thomas <[EMAIL PROTECTED]>, list owner
