Teleseism

A teleseism is a tremor caused by an earthquake that is very far away (from the Ancient Greek τῆλε) from where it is recorded. According to the USGS, the term teleseismic refers to earthquakes that occur more than 1000 km from the measurement site.[1] Small teleseismic events register only on sensitive seismometers in low background noise locations. In general, seismic waves from earthquakes of magnitude 5.0 and up can be recorded almost anywhere in the world with modern seismic instrumentation.[2]

Seismogram of a teleseismic earthquake (in Tajikistan, recorded in Princeton, NJ)
Record of a magnitude 6.5 event in Tajikistan captured by a broadband seismometer in the basement of Princeton University's Guyot Hall, 10,572 km from the source

References
  1. Anderson DN, Fagan DK, Tinker MA, Kraft GD, Hutchenson KD (2007). "A mathematical statistics formulation of the teleseismic explosion". Bulletin of the Seismological Society of America. 97 (5): 1730–41. doi:10.1785/0120060052.
  2. Ekström G, Nettles M, Dziewoński A.M. (2012). "The Global CMT Project". Physics of the Earth and Planetary Interiors. 200–201: 1–9. doi:10.1016/j.pepi.2012.04.002.{{cite journal}}: CS1 maint: multiple names: authors list (link)
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.