John Vidale

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John Emilio Vidale (March 15, 1959 –) is an American-born seismologist who specializes in examining seismograms to explore features within the Earth. He received the American Geophysical Union's James B. Macelwane Medal in 1994.

Vidale was born in Philadelphia, Pennsylvania, USA, studied physics and geology at Yale, and obtained his Ph.D. from Caltech in 1987. He then held research positions at UC Santa Cruz and the USGS, until he joined UCLA in 1995. In 2006, he moved to Seattle to direct the Pacific Northwest Seismic Network at the University of Washington. He was a Gutenberg Fellow at Caltech and a Gilbert Fellow of the USGS. Vidale is a Fellow of AGU and received AGU's Macelwane Medal^[1].

He has studied the relation of Earth tides and earthquakes - finding only the strongest tides noticeably effect the timing of earthquakes^[2], earthquake swarms - finding they are a more general phenomenon than he previously suspected^[3], the inner core - discovering high-frequency seismic waves scattered scattered therein that offer a second line of evidence it is rotating about 0.2 degrees per year^[4][5], the stronger than expected healing of fault zones after an earthquake^[6], and various details of the seismic structure of the mantle^[7].

Vidale also contributed an improved method of ray tracing which relied on a finite-difference approximation of the eikonal equation and which has been used widely in both earthquake and reflection seismology. There have been some controversies surrounding his research, including endorsements of risky experiments^[8][9][10], misquotes^[11], and mild ridicule^[12] as well.

[edit] External links

• UW web page, including links to PDFs of 80 or so reviewed papers
• UCLA web page

[edit] References

1. ^ Macelwane medal (Apr 21, 1994). Retrieved on 2007-04-11.
2. ^ Wired (May 25, 2004). Retrieved on 2007-04-11.
3. ^ India's national newspaper (November 2, 2006). Retrieved on 2007-04-11.
4. ^ American Scientist (Sept, 2002). Retrieved on 2007-04-11.
5. ^ Science Now (May 25, 2000). Retrieved on 2007-04-11.
6. ^ Science Daily Article (Feb 3, 2003). Retrieved on 2007-04-11.
7. ^ Science Daily (Feb 12, 1998). Retrieved on 2007-04-11.
8. ^ The Science Show (May 4, 2003). Retrieved on 2007-04-11.
9. ^ KCET Life and Times (May 3, 2004). Retrieved on 2007-04-11.
10. ^ Geotimes (March, 2004). Retrieved on 2007-04-11.
11. ^ Pravda (May 30, 2002). Retrieved on 2007-04-11.
12. ^ It lurks under Barrow (April 14, 1993). Retrieved on 2007-04-11.