Seismic Activity Rates in the Iberian Peninsula

Crespo Álvarez, María José and Marti Rodriguez, Joaquin and Martinez Cutillas, Francisco J. (2012). Seismic Activity Rates in the Iberian Peninsula. In: "15th World Conference on Earthquake Engineering", 24/09/2012 - 28/09/2012, Lisboa, Portugal. pp. 1-10.


Title: Seismic Activity Rates in the Iberian Peninsula
  • Crespo Álvarez, María José
  • Marti Rodriguez, Joaquin
  • Martinez Cutillas, Francisco J.
Item Type: Presentation at Congress or Conference (Article)
Event Title: 15th World Conference on Earthquake Engineering
Event Dates: 24/09/2012 - 28/09/2012
Event Location: Lisboa, Portugal
Title of Book: 15th World Conference on Earthquake Engineering
Date: 2012
Faculty: E.T.S.I. Minas (UPM)
Department: Ingeniería de Materiales [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Evaluating the seismic hazard requires establishing a distribution of the seismic activity rate, irrespective of the methodology used in the evaluation. In practice, how that activity rate is established tends to be the main difference between the various evaluation methods. The traditional procedure relies on a seismogenic zonation and the Gutenberg-Richter (GR) hypothesis. Competing zonations are often compared looking only at the geometry of the zones, but the resulting activity rate is affected by both geometry and the values assigned to the GR parameters. Contour plots can be used for conducting more meaningful comparisons, providing the GR parameters are suitably normalised. More recent approaches for establishing the seismic activity rate forego the use of zones and GR statistics and special attention is paid here to such procedures. The paper presents comparisons between the local activity rates that result for the complete Iberian Peninsula using kernel estimators as well as two seismogenic zonations. It is concluded that the smooth variation of the seismic activity rate produced by zoneless methods is more realistic than the stepwise changes associated with zoned approaches; moreover, the choice of zonation often has a stronger influence on the results than its fairly subjective origin would warrant. It is also observed that the activity rate derived from the kernel approach, related with the GR parameter “a”, is qualitatively consistent with the epicentres in the catalogue. Finally, when comparing alternative zonations it is not just their geometry but the distribution of activity rate that should be compared.

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Item ID: 20845
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Deposited by: Memoria Investigacion
Deposited on: 03 Oct 2013 08:47
Last Modified: 22 Sep 2014 11:21
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