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Rayleigh waves from correlation of seismic noise in Great Island of Tierra del Fuego,Argentina:Constraints on upper crustal structure

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Geodesy and Geodynamics 2018年第1期9卷 2-12页

作者： Carolina Buffoni martin schimmel Nora Cristina Sabbione María Laura Rosa Gerardo Connon Faculty of Astronomical and Geophysical Sciences National University of La PlataPaseo Del Bosque Sin B1900F WAArgentina Institute of Earth SciencesJaume Almera-CSIC Lluis SoléSabarfs S/n Barcelona E-08028Spain Astronomical Station of Rio Grande(EARG) Ruta C y Acceso Aeropuerto9420EARRfo GrandeArgentina National Scientific and Technical Research Council(CONICET) Av.Rivadavia 1917 C1033AAJAutonomous City of Buenos AiresArgentina

In this study, the ambient seismic noise cross-correlation technique is applied to estimate the upper structure of the crust beneath Great Island of Tierra del Fuego（TdF）, Argentina, by the analysis of shortperiod Rayleigh wave group velocities. The island, situated in the southernmost South America, is a key area of investigation among the interaction between the South American and Scotia plates and is considered as a very seismically active one. Through cross-correlating the vertical components of ambient seismic noise registered at four broadband stations in TdF, we were able to extract Rayleigh waves which were used to estimate group velocities in the period band of 2.5-16 s using a timefrequency analysis. Although ambient noise sources are distributed in homogeneously, robust empirical Green＇s functions could be recovered from the cross-correlation of 12 months of ambient noise, The observed group velocities were inverted considering a non-linear iterative damped least-squares inversion procedure and several 1-D shear wave velocity models of the upper crust were *** to the inversion results, the S-wave velocity ranges between 1.75 and 3,7 km/s in the first10 km of crust, depending on the pair of stations considered. These results are in agreement to the major known surface and sub-surface geological and tectonic features known in the area. This study represents the first ambient seismic noise analysis in TdF in order to constraint the upper crust beneath this *** can also be considered as a successful feasibility study for future analyses with a denser station deployment for a more detailed imaging of structure.

关键词： Ambient seismic noise cross-correlation Rayleigh wave dispersion Upper crust Tierra del Fuego

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