April 18, 2006

100 Years Ago

On April 18, 1906, San Francisco woke at 5:13 am to one of the largest earthquakes recorded in the United States. After experiencing the Loma Prieta earthquake in 1989, I've been a student of earthquakes and the 1906 quake has always fascinated me. The USGS has a great piece on this quake that includes this piece showing what the seismogram looked like in Gottingen, Germany compared to the seismogram of the Loma Prieta quake.

1906_loma_prieta.gif

For as long as I can remember, the 1906 quake was said to register at 8.3 on the Richter scale. Recent studies have reset that magnitude to 7.7 or 7.9 - still a huge quake, but not the monster once thought.

Posted by Mary at April 18, 2006 08:00 AM | Science | Technorati links |
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