Franklin & Marshall College Franklin & Marshall College

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Franklin & Marshall Seismograph

F&M has a state-of-the-art Guralp CMG-40T broadband digital seismometer. The sensor is sited near the Hackman building. Ground vibrations are converted by the seismometer to electrical signals, and fed to computer software. Data are stored digitally, so that the traditional drums with pen-on-paper records are not required. The software produces an image that is displayed as a webpage, and is refreshed every two minutes. This can be accessed at the Lamont-Doherty Cooperative Seismograph Network website; then select station FMPA at the bottom left . The scale on the left (EDT) is local time; the scale on the right (UCT) is Greenwich mean time. One horizontal line represents 30 minutes, and a full screen represents one day. Alternating colors help to distinguish the lines. The vertical deflection represents the amplitude of ground motion.

Our seismograph is capable of detecting seismic waves generated by large earthquakes anywhere in the world. Nonseismic events, like quarry blasts in the Lancaster area, can also be detected. Epicenters can be located using data from three or more seismographs. Our seismograph is not calibrated for earthquake magnitudes.

We are members of the Lamont-Doherty Cooperative Seismographic Network , administered by Columbia University to focus on earthquakes of the Mid-Atlantic region. See the U.S. GEological Survey Earthquake Hazards Program for information on recent and historic earthquakes, and to learn more about seismology.

Our kiosk display in the Hackman Science Center uses Active Earth by IRIS (Incorporated Research Institutions for Seismology). Different web pages rotate on a timed basis, or you may change the display by TOUCHING the green arrows. Touching the F&M logo in the top center will return you to the F&M seismogram.