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April 28, 2003 at 3:48 pm - More than 2 years ago

“Sensing a Vibe: Seismic-alert system could give Los Angeles a few seconds’ warning” (SN: 5/3/03, p. 276: Sensing a Vibe: Seismic-alert system could give Los Angeles a few seconds’ warning) says that the S waves travel at about one-half the speed of the P waves. Then, in this article, it would appear that the P waves travel at one-half the speed of the S waves.