The United States Geological Survey (USGS) confirmed the quake, which struck at approximately 3:26 a.m. The epicenter was ...

The logarithmic earthquake magnitude scale used relatively high-frequency data from nearby seismograph stations, according to the USGS, but as more stations were installed around the world ...

The seismograph, Model EQ-1 (Next Generation Science), is located in a second floor classroom of the Julian Science and Mathematics Center. The unit is a horizontal beam seismograph that is designed ...

In each of these cases, the time scale was so small that the earthquake ... with a Bosch-Omori seismograph drum, rate 15 mm./min., and smoked paper recording. The well is known as 3612A2.