Print Email Facebook Twitter Tectonic tremor characterized by principal-component analysis in the vicinity of central Chile and Argentina Title Tectonic tremor characterized by principal-component analysis in the vicinity of central Chile and Argentina Author Nishitsuji, Y. (TU Delft Applied Geophysics and Petrophysics; Petro Summit E&P Corporation) Marín, Luis Franco (Observatorio Volcanológico de los Andes del Sur (OVDAS-SERNAGEOMIN)) Gomez, Martín (Comision Nacional de Energia Atomica) Rowe, C.A (Los Alamos National Laboratory) Draganov, D.S. (TU Delft Applied Geophysics and Petrophysics) Date 2019 Abstract No conclusive evidence has been presented to date for tectonic tremor (TT) in the vicinity of central Chile, where the Nazca Plate is subducting beneath the South American Plate. Subduction in our experimental location (roughly 35.5° S, 70.5° W) is steep and fairly unobstructed compared to the flattened and more seismogenic behavior to the north. We seek to identify TT in our experimental area, whose geodynamics are comparable to tremor-rich subduction zones such as Cascadia and the Nankai Trough. Our method combines time-series visual inspection, frequency-spectrum analysis, waveform cross-correlation, and 3-component (3C) signal covariance to explore the presence of TT in this region. We have identified TT using stations in central Chile and the Malargüe region, Argentina. The TT exhibits similar features to other TT observations worldwide. Waveform characteristics for the TT in our study, particularly dimension of the 3C signal covariance, vary as a function of apparent source location. The duration of one episode of identified TT was about 10 h, which may indicate that the plate interface where tremor generates is strongly coupled. We conclude that our observations reflect features of the local propagation, rather than the tremor source itself. Subject ArgentinaCross-correlationGeophysicsPrincipal-component analysisTectonic tremor To reference this document use: http://resolver.tudelft.nl/uuid:931ae533-9a2d-4abb-bcba-7184f5519c4c DOI https://doi.org/10.1016/j.jsames.2019.04.022 Embargo date 2021-10-01 ISSN 0895-9811 Source Journal of South American Earth Sciences, 94 Bibliographical note Accepted Author Manuscript Part of collection Institutional Repository Document type journal article Rights © 2019 Y. Nishitsuji, Luis Franco Marín, Martín Gomez, C.A Rowe, D.S. Draganov Files PDF SAMES_2018_308_Revision_2 ... r_pure.pdf 31.77 MB Close viewer /islandora/object/uuid:931ae533-9a2d-4abb-bcba-7184f5519c4c/datastream/OBJ/view