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USGS CMG InfoBank: Monitoring Earthquakes

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Comment: 24:30 - 25:24 (00:54)
Source: Annenberg/CPB Resources - Earth Revealed - 9. Earthquakes
Keywords: "earthquake alert levels", "Menlo Park", USGS, "Cathleen Aviles", Parkfield, seismologists, "earthquake prediction"

Our transcription: In the case of the Parkfield Experiment, the data obtained in the field are then regularly transmitted by satellite to the U. S. Geological Survey in Menlo Park, California, for analysis.
Here the data are monitored by scientists for any unusual activity.
Depending on the extent of such activity, the Parkfield research team may declare any one of four prearranged alert levels.
These alert levels indicate the probability of a sizable earthquake occurring at Parkfield within the following 72 hours.
If and when there is a high level alert, the USGS will inform the California office of emergency services, which will then issue a warning to the public.
This warning signifies that the seismologists at the USGS in Menlo Park believe there is, at least, a 30 percent chance a magnitude 6 or higher earthquake will occur in Parkfield during the next 72 hours.

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