1906 San Francisco Earthquake Seismogram
http://quake.wr.usgs.gov/info/1906/got_seismogram.html

David J Wald, Hiroo Kanamori, Donald V Helmberger, USGS


A seismogram of the 1906 Earthquake from a recording station in Gottingen, Germany. The records here show 26 minutes of north-south and east-west motion, recording the P and S waves from the great quake. When the surface waves arrived 26 minutes later, they threw the seismograph off-scale.

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This resource is referenced here:Keywords: earthquake, san francisco, 1906