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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