A generalized theory for full microtremor horizontal-to-vertical [H/V(z, f)] spectral ratio interpretation in offshore and onshore environments

Agostiny Marrios Lontsi, Antonio García-Jerez, Juan Camilo Molina-Villegas, Francisco José Sánchez-Sesma, Christian Molkenthin, Matthias Ohrnberger, Frank Krüger, Rongjiang Wang, Donat Fäh

Resultado de la investigación: Contribución a una revistaArtículo

Resumen

Advances in the field of seismic interferometry have provided a basic theoretical interpretation to the full spectrum of the microtremor horizontal-to-vertical spectral ratio [H/V(f)]. The interpretation has been applied to ambient seismic noise data recorded both at the surface and at depth. The new algorithm, based on the diffuse wavefield assumption, has been used in inversion schemes to estimate seismic wave velocity profiles that are useful input information for engineering and exploration seismology both for earthquake hazard estimation and to characterize surficial sediments. However, until now, the developed algorithms are only suitable for on land environments with no offshore consideration. Here, the microtremor H/V(z, f) modelling is extended for applications to marine sedimentary environments for a 1-D layered medium. The layer propagator matrix formulation is used for the computation of the required Green's functions. Therefore, in the presence of a water layer on top, the propagator matrix for the uppermost layer is defined to account for the properties of the water column. As an application example we analyse eight simple canonical layered earth models. Frequencies ranging from 0.2 to 50 Hz are considered as they cover a broad wavelength interval and aid in practice to investigate subsurface structures in the depth range from a few meters to a few hundreds of meters. Results show a marginal variation of 8 per cent at most for the fundamental frequency when a water layer is present. The water layer leads to variations in H/V peak amplitude of up to 50 per cent atop the solid layers.

Idioma originalInglés
Páginas (desde-hasta)1276-1297
Número de páginas22
PublicaciónGeophysical Journal International
Volumen218
N.º2
DOI
EstadoPublicada - 2 may 2019

Huella dactilar

microtremor
Water
Surficial sediments
Seismology
water
Seismic waves
Green's function
Interferometry
seismic noise
Earthquakes
Hazards
matrix
layered medium
seismology
propagation
Earth (planet)
surficial sediment
seismic waves
Green function
matrices

Citar esto

Lontsi, Agostiny Marrios ; García-Jerez, Antonio ; Molina-Villegas, Juan Camilo ; Sánchez-Sesma, Francisco José ; Molkenthin, Christian ; Ohrnberger, Matthias ; Krüger, Frank ; Wang, Rongjiang ; Fäh, Donat. / A generalized theory for full microtremor horizontal-to-vertical [H/V(z, f)] spectral ratio interpretation in offshore and onshore environments. En: Geophysical Journal International. 2019 ; Vol. 218, N.º 2. pp. 1276-1297.
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title = "A generalized theory for full microtremor horizontal-to-vertical [H/V(z, f)] spectral ratio interpretation in offshore and onshore environments",
abstract = "Advances in the field of seismic interferometry have provided a basic theoretical interpretation to the full spectrum of the microtremor horizontal-to-vertical spectral ratio [H/V(f)]. The interpretation has been applied to ambient seismic noise data recorded both at the surface and at depth. The new algorithm, based on the diffuse wavefield assumption, has been used in inversion schemes to estimate seismic wave velocity profiles that are useful input information for engineering and exploration seismology both for earthquake hazard estimation and to characterize surficial sediments. However, until now, the developed algorithms are only suitable for on land environments with no offshore consideration. Here, the microtremor H/V(z, f) modelling is extended for applications to marine sedimentary environments for a 1-D layered medium. The layer propagator matrix formulation is used for the computation of the required Green's functions. Therefore, in the presence of a water layer on top, the propagator matrix for the uppermost layer is defined to account for the properties of the water column. As an application example we analyse eight simple canonical layered earth models. Frequencies ranging from 0.2 to 50 Hz are considered as they cover a broad wavelength interval and aid in practice to investigate subsurface structures in the depth range from a few meters to a few hundreds of meters. Results show a marginal variation of 8 per cent at most for the fundamental frequency when a water layer is present. The water layer leads to variations in H/V peak amplitude of up to 50 per cent atop the solid layers.",
keywords = "Earthquake hazards, Numerical modelling, Seismic interferometry, Site effects, Theoretical seismology, Wave propagation",
author = "Lontsi, {Agostiny Marrios} and Antonio Garc{\'i}a-Jerez and Molina-Villegas, {Juan Camilo} and S{\'a}nchez-Sesma, {Francisco Jos{\'e}} and Christian Molkenthin and Matthias Ohrnberger and Frank Kr{\"u}ger and Rongjiang Wang and Donat F{\"a}h",
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Lontsi, AM, García-Jerez, A, Molina-Villegas, JC, Sánchez-Sesma, FJ, Molkenthin, C, Ohrnberger, M, Krüger, F, Wang, R & Fäh, D 2019, 'A generalized theory for full microtremor horizontal-to-vertical [H/V(z, f)] spectral ratio interpretation in offshore and onshore environments', Geophysical Journal International, vol. 218, n.º 2, pp. 1276-1297. https://doi.org/10.1093/gji/ggz223

A generalized theory for full microtremor horizontal-to-vertical [H/V(z, f)] spectral ratio interpretation in offshore and onshore environments. / Lontsi, Agostiny Marrios; García-Jerez, Antonio; Molina-Villegas, Juan Camilo; Sánchez-Sesma, Francisco José; Molkenthin, Christian; Ohrnberger, Matthias; Krüger, Frank; Wang, Rongjiang; Fäh, Donat.

En: Geophysical Journal International, Vol. 218, N.º 2, 02.05.2019, p. 1276-1297.

Resultado de la investigación: Contribución a una revistaArtículo

TY - JOUR

T1 - A generalized theory for full microtremor horizontal-to-vertical [H/V(z, f)] spectral ratio interpretation in offshore and onshore environments

AU - Lontsi, Agostiny Marrios

AU - García-Jerez, Antonio

AU - Molina-Villegas, Juan Camilo

AU - Sánchez-Sesma, Francisco José

AU - Molkenthin, Christian

AU - Ohrnberger, Matthias

AU - Krüger, Frank

AU - Wang, Rongjiang

AU - Fäh, Donat

PY - 2019/5/2

Y1 - 2019/5/2

N2 - Advances in the field of seismic interferometry have provided a basic theoretical interpretation to the full spectrum of the microtremor horizontal-to-vertical spectral ratio [H/V(f)]. The interpretation has been applied to ambient seismic noise data recorded both at the surface and at depth. The new algorithm, based on the diffuse wavefield assumption, has been used in inversion schemes to estimate seismic wave velocity profiles that are useful input information for engineering and exploration seismology both for earthquake hazard estimation and to characterize surficial sediments. However, until now, the developed algorithms are only suitable for on land environments with no offshore consideration. Here, the microtremor H/V(z, f) modelling is extended for applications to marine sedimentary environments for a 1-D layered medium. The layer propagator matrix formulation is used for the computation of the required Green's functions. Therefore, in the presence of a water layer on top, the propagator matrix for the uppermost layer is defined to account for the properties of the water column. As an application example we analyse eight simple canonical layered earth models. Frequencies ranging from 0.2 to 50 Hz are considered as they cover a broad wavelength interval and aid in practice to investigate subsurface structures in the depth range from a few meters to a few hundreds of meters. Results show a marginal variation of 8 per cent at most for the fundamental frequency when a water layer is present. The water layer leads to variations in H/V peak amplitude of up to 50 per cent atop the solid layers.

AB - Advances in the field of seismic interferometry have provided a basic theoretical interpretation to the full spectrum of the microtremor horizontal-to-vertical spectral ratio [H/V(f)]. The interpretation has been applied to ambient seismic noise data recorded both at the surface and at depth. The new algorithm, based on the diffuse wavefield assumption, has been used in inversion schemes to estimate seismic wave velocity profiles that are useful input information for engineering and exploration seismology both for earthquake hazard estimation and to characterize surficial sediments. However, until now, the developed algorithms are only suitable for on land environments with no offshore consideration. Here, the microtremor H/V(z, f) modelling is extended for applications to marine sedimentary environments for a 1-D layered medium. The layer propagator matrix formulation is used for the computation of the required Green's functions. Therefore, in the presence of a water layer on top, the propagator matrix for the uppermost layer is defined to account for the properties of the water column. As an application example we analyse eight simple canonical layered earth models. Frequencies ranging from 0.2 to 50 Hz are considered as they cover a broad wavelength interval and aid in practice to investigate subsurface structures in the depth range from a few meters to a few hundreds of meters. Results show a marginal variation of 8 per cent at most for the fundamental frequency when a water layer is present. The water layer leads to variations in H/V peak amplitude of up to 50 per cent atop the solid layers.

KW - Earthquake hazards

KW - Numerical modelling

KW - Seismic interferometry

KW - Site effects

KW - Theoretical seismology

KW - Wave propagation

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DO - 10.1093/gji/ggz223

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JO - Geophysical Journal International

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