Source: Servicio Sismológico de Chile
From: Toponymisches Heft No. 3 – Seismolology, p. 5.
‚Beginning of the earthquake of August 16 1906‘ scraped into the smoked paper. A seismocope located at the National Observatory in Santiago records the event which occurred at 19:55 local time in Valparaíso/Chile. Due to the strong vibrations the recording needle snapped.