Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina

A preliminary near-surface seismic survey was carried out at Llancanelo Lake (Argentina) with the aim of mapping the quaternary layers, composed of sedimentary layers overlying basalt. A geological model has been obtained by interpreting the events of a common-shot gather. Expressions of the travelt...

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Detalles Bibliográficos
Autores principales: Carcione, José M., de la Vega, Matías, Osella, Ana María, Tassone, Alejandro Alberto
Publicado: 2013
Materias:
Interpretation
Modeling
Processing
Waves
basalt
data interpretation
model test
numerical model
P-wave
Quaternary
Rayleigh wave
S-wave
sediment analysis
sediment thickness
seismic data
seismic reflection
seismic survey
seismic velocity
signal processing
stacking
structural geology
travel time
Argentina
Llancanelo Lagoon
Mendoza
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09630651_v22_n1_p1_Carcione
http://hdl.handle.net/20.500.12110/paper_09630651_v22_n1_p1_Carcione
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09630651_v22_n1_p1_Carcione
record_format dspace
spelling paper:paper_09630651_v22_n1_p1_Carcione2023-06-08T15:58:11Z Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina Carcione, José M. de la Vega, Matías Osella, Ana María Tassone, Alejandro Alberto Interpretation Modeling Processing Waves basalt data interpretation model test numerical model P-wave Quaternary Rayleigh wave S-wave sediment analysis sediment thickness seismic data seismic reflection seismic survey seismic velocity signal processing stacking structural geology travel time Argentina Llancanelo Lagoon Mendoza A preliminary near-surface seismic survey was carried out at Llancanelo Lake (Argentina) with the aim of mapping the quaternary layers, composed of sedimentary layers overlying basalt. A geological model has been obtained by interpreting the events of a common-shot gather. Expressions of the traveltimes of the direct and refracted waves versus offset provide means to evaluate the velocities of the layers and thickness of the upper layer. Moreover, the standard processing sequence is applied to the data to obtain a stacked section. This procedure reveals the location of deeper interfaces, although it is highly affected by the filtering of the direct and refracted events, which have the same slope of the medium- and far-offset reflection signals. The fact that the direct arrival has not a zero intercept time indicates the presence of a very thin layer at the surface(shallow salt deposits). Further evidence of the near-surface layer is that the refracted and reflection events are ringing and there are strongly dispersive Rayleigh waves. An interface has been found approximately between 54 and 57 m depth. The P- and S-wave velocities of the shallow layer are 2000 and 550 m/s, according to the slopes of the direct and Rayleigh waves, respectively, and rock-physics empirical relations, while the lower layer has a P-wave velocity of 2800 m/s, obtained from the refracted event. A tentative interpretation of the apex of a reflection event locates the top of the basalt layer at 190 m depth approximately. A viscoelastic model has been defined, with quality factors of typical volcaniclastic sediments. We then compute a synthetic common-shot gather and snapshots by means of full-wave pseudospectral methods. The synthetic gather resembles the real one, providing additional support to the interpretation. © 2013 Geophysical Press Ltd. Fil:Carcione, J.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:De La Vega, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Osella, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tassone, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09630651_v22_n1_p1_Carcione http://hdl.handle.net/20.500.12110/paper_09630651_v22_n1_p1_Carcione
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Interpretation
Modeling
Processing
Waves
basalt
data interpretation
model test
numerical model
P-wave
Quaternary
Rayleigh wave
S-wave
sediment analysis
sediment thickness
seismic data
seismic reflection
seismic survey
seismic velocity
signal processing
stacking
structural geology
travel time
Argentina
Llancanelo Lagoon
Mendoza
spellingShingle Interpretation
Modeling
Processing
Waves
basalt
data interpretation
model test
numerical model
P-wave
Quaternary
Rayleigh wave
S-wave
sediment analysis
sediment thickness
seismic data
seismic reflection
seismic survey
seismic velocity
signal processing
stacking
structural geology
travel time
Argentina
Llancanelo Lagoon
Mendoza
Carcione, José M.
de la Vega, Matías
Osella, Ana María
Tassone, Alejandro Alberto
Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina
topic_facet Interpretation
Modeling
Processing
Waves
basalt
data interpretation
model test
numerical model
P-wave
Quaternary
Rayleigh wave
S-wave
sediment analysis
sediment thickness
seismic data
seismic reflection
seismic survey
seismic velocity
signal processing
stacking
structural geology
travel time
Argentina
Llancanelo Lagoon
Mendoza
description A preliminary near-surface seismic survey was carried out at Llancanelo Lake (Argentina) with the aim of mapping the quaternary layers, composed of sedimentary layers overlying basalt. A geological model has been obtained by interpreting the events of a common-shot gather. Expressions of the traveltimes of the direct and refracted waves versus offset provide means to evaluate the velocities of the layers and thickness of the upper layer. Moreover, the standard processing sequence is applied to the data to obtain a stacked section. This procedure reveals the location of deeper interfaces, although it is highly affected by the filtering of the direct and refracted events, which have the same slope of the medium- and far-offset reflection signals. The fact that the direct arrival has not a zero intercept time indicates the presence of a very thin layer at the surface(shallow salt deposits). Further evidence of the near-surface layer is that the refracted and reflection events are ringing and there are strongly dispersive Rayleigh waves. An interface has been found approximately between 54 and 57 m depth. The P- and S-wave velocities of the shallow layer are 2000 and 550 m/s, according to the slopes of the direct and Rayleigh waves, respectively, and rock-physics empirical relations, while the lower layer has a P-wave velocity of 2800 m/s, obtained from the refracted event. A tentative interpretation of the apex of a reflection event locates the top of the basalt layer at 190 m depth approximately. A viscoelastic model has been defined, with quality factors of typical volcaniclastic sediments. We then compute a synthetic common-shot gather and snapshots by means of full-wave pseudospectral methods. The synthetic gather resembles the real one, providing additional support to the interpretation. © 2013 Geophysical Press Ltd.
author Carcione, José M.
de la Vega, Matías
Osella, Ana María
Tassone, Alejandro Alberto
author_facet Carcione, José M.
de la Vega, Matías
Osella, Ana María
Tassone, Alejandro Alberto
author_sort Carcione, José M.
title Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina
title_short Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina
title_full Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina
title_fullStr Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina
title_full_unstemmed Seismic characterization of the quaternary sediments at Llancanelo-Lake area, Argentina
title_sort seismic characterization of the quaternary sediments at llancanelo-lake area, argentina
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09630651_v22_n1_p1_Carcione
http://hdl.handle.net/20.500.12110/paper_09630651_v22_n1_p1_Carcione
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AT delavegamatias seismiccharacterizationofthequaternarysedimentsatllancanelolakeareaargentina
AT osellaanamaria seismiccharacterizationofthequaternarysedimentsatllancanelolakeareaargentina
AT tassonealejandroalberto seismiccharacterizationofthequaternarysedimentsatllancanelolakeareaargentina
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