Earthquake!! Foreshock, Mainshock, or Aftershock? Which was it?
www.iris.edu/earthquake
There is often confusion surrounding the terminology of earthquakes. Large earthquakes are usually followed by hundreds and even thousands of smaller earthquakes, called aftershocks. In some earthquake sequences, a smaller earthquake called a “foreshock”, precedes the mainshock. Although seismologists have carefully analyzed foreshock/mainshock pairs of earthquakes, and earthquake triggering in general, there are no special characteristics of a foreshock that let us know it is a foreshock until the mainshock occurs. Rate of aftershocks was first studied in detail by Fusakichi Omori, Chairman of Seismology at Imperial University of Tokyo; one of the most important figures in the history of seismology.
Written & directed by Dr. Robert F. Butler, University of Portland
Animation & graphics: Jenda Johnson, Earth Sciences Animated
Narrated by Dr. Wendy Bohon, Education Specialist, IRIS
Reviewed by Dr. Peter Haeussler, U.S. Geological Survey,
Earthquake locations: IRIS Earthquake Browser, (IEB)
Maps: IEB, USGS, Google Earth
Photos from public domain sources
Video clips from FEMA
Music “J-sketches 1” by Andrew Menking
Made with support from the National Science Foundation (NSF)
Видео Earthquake!! Foreshock, Mainshock, or Aftershock? Which was it? канала IRIS Earthquake Science
There is often confusion surrounding the terminology of earthquakes. Large earthquakes are usually followed by hundreds and even thousands of smaller earthquakes, called aftershocks. In some earthquake sequences, a smaller earthquake called a “foreshock”, precedes the mainshock. Although seismologists have carefully analyzed foreshock/mainshock pairs of earthquakes, and earthquake triggering in general, there are no special characteristics of a foreshock that let us know it is a foreshock until the mainshock occurs. Rate of aftershocks was first studied in detail by Fusakichi Omori, Chairman of Seismology at Imperial University of Tokyo; one of the most important figures in the history of seismology.
Written & directed by Dr. Robert F. Butler, University of Portland
Animation & graphics: Jenda Johnson, Earth Sciences Animated
Narrated by Dr. Wendy Bohon, Education Specialist, IRIS
Reviewed by Dr. Peter Haeussler, U.S. Geological Survey,
Earthquake locations: IRIS Earthquake Browser, (IEB)
Maps: IEB, USGS, Google Earth
Photos from public domain sources
Video clips from FEMA
Music “J-sketches 1” by Andrew Menking
Made with support from the National Science Foundation (NSF)
Видео Earthquake!! Foreshock, Mainshock, or Aftershock? Which was it? канала IRIS Earthquake Science
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21 февраля 2019 г. 6:00:48
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