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   Seismic Background Noise of Puerto Rico
    By: Rafael Pujols

In this thesis, the seismic background noise in Puerto Rico was characterized using data from eleven broadband seismic stations for a period of three years from 2005 to 2007. Then the calibration files and data conversion were made for each seismic station to the Standard for Exchange of Earthquake Data (SEED) format, and then used the software PQLX to make noise analysis, which use power spectral density (PSD) and probability density function (PDF) with algorithms describe in McNamara and Buland (2004). The different noises that were characterized are: 1) Cultural noise, 2) Wind, water and geological noise, 3) Microseisms and 4) System artifact in the PDF noise field like data gaps and sensor glitches. This is very useful for seismic network quality control. In addition the diurnal, seasonal geographical variations of the seismic noise were made. In general, The Puerto Rico Seismic Network has a good performance in their broadband seismic station and need to improve their site for reducing cultural noise.

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