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

作者：Jimenez A^*; Garcia Garcia J M; Romacho M D; Garcia Jerez A; Luzon F

来源：Pure and Applied Geophysics, 2015, 172(11): 3163-3177.

DOI：10.1007/s00024-014-0883-y

• Source parameters
• Reservoir induced seismicity
• Genetic Algorithm
• Self-Organizing maps

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.

• 出版日期2015-11