November 1960 Peru earthquake

The November 1960 Peru earthquake occurred offshore northern Peru on November 20 at 17:02 local time. The magnitude of the earthquake was put at Ms 6.75 by using the conventional magnitude measurement within a shorter duration of ~20 s.[2][3] However, there is a large discrepancy between the magnitudes in Ms and Mw in this earthquake. The discrepancy was resulted from that the earthquake had a long source duration of about 130 s, and by calculating the seismic moment, the magnitude would be Mw 7.6 or Mw 7.8, according to different sources.[1][3] This earthquake belongs to a category of earthquakes with slow rupture velocities and potential of producing tsunamis larger than those expected from the moment magnitudes.[4]

November 1960 Peru earthquake
Lima
Arica
UTC time1960-11-20 22:01:57
ISC event880820
USGS-ANSSComCat
Local dateNovember 20, 1960
Local time17:02
Magnitude7.8 Mw [1]
Depth35 km (22 mi) [1]
Epicenter6.70°S 80.62°W / -6.70; -80.62 [1]
Areas affectedPeru
TsunamiYes

This earthquake triggered a tsunami with a height of 9 meters (30 ft) in Puerto Eten, Lambayeque Department.[5] The tsunami caused damage along the coast of the Lambayeque department. Three deaths were reported in Lambayeque Department. Thirteen deaths and 50 missing were reported in Guañape Islands, La Libertad Department. The tsunami was also observed in Hilo, Hawaii.[5]

See also

References
  1. Engdahl, E. R.; Vallaseñor, A. (2002). "Global seismicity: 1900–1999" (PDF). International Handbook of Earthquake & Engineering Seismology. Part A, Volume 81A (First ed.). Academic Press. p. 681. ISBN 978-0124406520. Archived from the original (PDF) on 2011-08-06.
  2. http://www.es.ucsc.edu/~thorne/TL.pdfs/LB_megathrust_SEIZE.pdf
  3. Pelayo, A. M.; Wiens, D. A. (1990). "The November 20,1960 Peru Tsunami Earthquake: Source mechanism of a slow event". Geophysical Research Letters. 17 (6): 661–664. doi:10.1029/gl017i006p00661.
  4. Sladen, A.; Tavera, H.; Simons, M.; Avouac, J.P.; Perfettini, H.; Audin, L.; Fielding, E.J.; Ortega, F.; Cavagnoud, R. (2010). "Source model of the 2007 Mw 8.0 Pisco, Peru earthquake: Implications for seismogenic behavior of subduction megathrusts" (PDF). Journal of Geophysical Research. 115: B02405. doi:10.1029/2009JB006429.
  5. "Comments for the Tsunami Event". National Geophysical Data Center / World Data Service (NGDC/WDS): Significant Earthquake Database. National Geophysical Data Center, NOAA. doi:10.7289/V5TD9V7K. Retrieved 21 April 2020.
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