Seismology highlights from BSSA February issue

A new study identifies earthquakes through July 2007 that have produced 100 of the strongest peak accelerations (PGA) and 100 of the strongest peak velocities (PGV) ever recorded. The threshold for the first list is acceleration of the ground exceeding 7.31 m/s2 (74% of gravity), while the threshold for the second is velocity exceeding 0.65 m/s. Crustal earthquakes dominate the lists. Exceptionally strong ground motions exceeding these levels have been observed on sites with the softest soils and sites with the hardest rock...

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