Source Parameters of Earthquakes Recorded Near the Itoiz Dam (Northern Spain)

Abigail Jimenez Lloret, J. M. Garcia-Garcia, M. D. Romacho, A. Garcia-Jerez, F. Luzon

Research output: Contribution to journalArticlepeer-review

Abstract

We calculate the source parameters and attenuation from earthquakes recorded near the Itoiz dam, from 2004 to 2009, with magnitudes ranging between 1.2 and 5.2. We use a Genetic Algorithm in order to fit the three-component P-wave spectra with the spectral level, corner frequency, and attenuation factor as searching parameters. The obtained moments range from 1.72 x 10(11) to 2.65 x 10(15) Nm, the radii span from 0.09 to 1.00 km, and the stress drops vary from 0.006 to 29.462 MPa. The maximum value for the Q attenuation factor is 794, and the minimum value is 53. We find a good agreement between empirical and theoretical relationships between moment and magnitude. There seems to be a breakdown of self-similarity, but it could be due to the method used. We group the data by means of a Self-Organizing Map and the clusters found are related by their magnitude, and not by other considerations.

Original languageEnglish
Pages (from-to)3163-3177
Number of pages15
JournalPure and Applied Geophysics
Volume172
Issue number11
DOIs
Publication statusPublished - Nov 2015

Keywords

  • Source parameters
  • Reservoir induced seismicity
  • Genetic Algorithm
  • Self-Organizing maps
  • SELF-ORGANIZING MAPS
  • SEISMIC-SOURCE PARAMETERS
  • DEEP BOREHOLE RECORDINGS
  • NEAR-SURFACE ATTENUATION
  • BASIN SOUTHERN SPAIN
  • SITE RESPONSE
  • KM DEPTH
  • P-WAVES
  • SIMULTANEOUS INVERSION
  • WESTERN PYRENEES

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