Application of Regional Moment Tensor (RMT) inversion procedures using regional seismograms from the Puerto Rico seismic network

dc.contributor.advisor Asencio, Eugenio Cameron-González, Antonio E. College of Arts and Sciences - Sciences en_US
dc.contributor.committee Huérfano, Víctor
dc.contributor.committee Mendoza, Carlos
dc.contributor.department Department of Geology en_US
dc.contributor.representative Santiago, Wilma 2017-12-08T13:59:54Z 2017-12-08T13:59:54Z 2006
dc.description.abstract We present the results of the application of regional moment tensor (RMT) inversion procedure within the eastern Caribbean area using regional seismograms recorded by the Puerto Rico Seismic Network (PRSN) during 2003-2006. Using data recorded over a three-year period, we estimated the source mechanisms for 6 earthquakes within the eastern Caribbean with moment magnitudes (Mw) ranging from 4.5 to 6.5. Comparisons of the computed source parameters with international agencies indicate that the RMT procedure provides an accurate estimate of the moment magnitude. The analysis is based on the moment-tensor inversion methodology developed by Randall et al., (1995) as implemented by Mendoza (2005) to estimate the earthquake source mechanism and magnitude from seismic waveforms recorded at regional distances. This study evaluates variables, such as the velocity model and the signal-to-noise-ratio (SNR) of the recorded waveforms, and it evaluates two different bandpass filters with corner frequencies at 20- to 50- sec and 30- to 60- sec. Two velocity models were tested, the regional Caribbean model from Ewing et al., (1968) and the Preliminary Reference Earth Model (PREM) from Dziewonski and Anderson, (1981). Our results show that using the combination of the PREM velocity model with a 30- to 60- sec bandpass filter with multiple stations improves the root-mean-square (RMS) error between the synthetics and observed waveforms. Single PRSN station inversions produce large RMS errors except at stations SJG and MPR. We observed that by changing the event depth and repeating the RMT inversion we were not able to constrain the depth of the event. en_US
dc.description.graduationYear 2006 en_US
dc.description.sponsorship University of Puerto Rico Sea Grant Program, Puerto Rico Seismic Network en_US
dc.language.iso en en_US
dc.rights.holder (c) 2006 Antonio E. Cameron González en_US
dc.rights.license All rights reserved en_US
dc.subject Regional moment tensor en_US
dc.subject Seismic waveforms en_US
dc.subject.lcsh Inversions (Geology) en_US
dc.subject.lcsh Seismic waves -- Puerto Rico. en_US
dc.subject.lcsh Seismograms -- Puerto Rico. en_US
dc.title Application of Regional Moment Tensor (RMT) inversion procedures using regional seismograms from the Puerto Rico seismic network en_US
dc.type Thesis en_US
dspace.entity.type Publication Geology en_US M.S. en_US
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