Posted by John Vidale on February 19, 2003 at 06:21:37:
Don, I looked over the predictions of 18 of the M6.5+ events claimed as successes by geoF. 18 is all they would give out from a 5-month period of their 18-month test yesterday, 6-10/2001. One glaring problem is that the majority of the quakes were bigger than the predicted size range, some by two magnitude units, and as I remember all were at least 1.5 units above the lower bound in magnitude. Is an accurate warning of an M8+ quake a prediction of an M4-6 quake? I don't think so. Given the Gutenberg- Richter distribution, which says there are many more small quakes than big quakes, none of the 18 predictions I saw would give people confident knowledge of an impending dangerous quake. We'd love to be able to predict dangerous earthquakes, and may find a way some day, but haven't yet. John
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