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Re: Japan's earthquake warning system
From: David Farber <dave () farber net>
Date: Mon, 26 Mar 2007 21:08:48 -0400
Begin forwarded message: From: Hasan Diwan <hasan.diwan () gmail com> Date: March 26, 2007 7:37:53 PM EDT To: dave () farber net Subject: Re: [IP] Japan's earthquake warning system On 26/03/07, David Farber <dave () farber net> wrote: The system detects a quake's initial P wave, which is the first jolt you feel, before the more severe S wave reaches you. (Both start out at the epicenter essentially simultaneously, but P waves travel faster; about 5km/s in rock, while S waves are about 60% of that.)P-waves are longitudinal and can travel through all types of material. S-waves are transverse and travel through matter that supports shear stress (read solids).
-- Cheers, Hasan Diwan <hasan.diwan () gmail com> ------------------------------------------- Archives: http://v2.listbox.com/member/archive/247/@now Powered by Listbox: http://www.listbox.com
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