On attenuation of the seismic Rayleigh waves propagating in an elastic crustal layer over viscoelastic mantle

Negin, Masoud; Akbarov, S. D.

doi:10.1007/s12040-019-1202-x

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…The LHVC is the largest active silica caldera complex in North America that is hosting an ac- Norini and Groppelli (2020). (a) Trans-Mexican Volcanic Belt (TMVB), with location of LHVC (Negin and Akbarov, 2019). (b) Volcanotectonic map of the Los Potreros caldera area, being illuminated from the east (on a digital elevation model, DEM).…”

Section: Background Geologymentioning

confidence: 99%

“…Another assumption that may be made is that the anisotropy is sensitive to melt; thus the fast directions are indications of said melt due to the differences in rheology (Negin and Akbarov, 2019). Based on mineral-liquid thermobarometry models, Lucci et al (2020) suggest a magmatic plumbing system comprising multiple shallow magma chambers.…”

Section: Presence Of Meltmentioning

confidence: 99%

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Constraints on fracture distribution in the Los Humeros geothermal field from beamforming of ambient seismic noise

Kennedy

Löer²,

Gilligan³

2022

Solid Earth

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Abstract. Faults and fractures are crucial parameters for geothermal systems as they provide secondary permeability allowing fluids to circulate and heat up in the subsurface. In this study, we use an ambient seismic noise technique referred to as three-component (3C) beamforming to detect and characterize faults and fractures at a geothermal field in Mexico. We perform 3C beamforming on ambient noise data collected at the Los Humeros Geothermal Field (LHGF) in Mexico. The LHGF is situated in a complicated geological area, part of a volcanic complex with an active tectonic fault system. Although the LHGF has been exploited for geothermal resources for over 3 decades, the field has yet to be explored at depths greater than 3 km. Consequently, it is currently unknown how deep faults and fractures permeate, and the LHGF has yet to be exploited to its full capacity. Three-component beamforming extracts the polarizations, azimuths and phase velocities of coherent waves as a function of frequency, providing a detailed characterization of the seismic wavefield. In this study, 3C beamforming of ambient seismic noise is used to determine surface wave velocities as a function of depth and propagation direction. Anisotropic velocities are assumed to relate to the presence of faults giving an indication of the maximum depth of permeability, a vital parameter for fluid circulation and heat flow throughout a geothermal field. Three-component beamforming was used to determine if the complex surface fracture system permeates deeper than is currently known. Our results show that anisotropy of seismic velocities does not decline significantly with depth, suggesting that faults and fractures, and hence permeability, persist below 3 km. Moreover, estimates of fast and slow directions, with respect to surface wave velocities, are used to determine the orientation of faults with depth. The north-east (NE) and north–north-west (NNW) orientation of the fast direction corresponds to the orientation of the Arroyo Grande and Maxtaloya–Los Humeros Fault swarms, respectively. NE and NNW orientations of anisotropy align with other major faults within the LHGF at depths permeating to 6 km.

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Section: Background Geologymentioning

confidence: 99%

Section: Presence Of Meltmentioning

confidence: 99%

Constraints on fracture distribution in the Los Humeros geothermal field from beamforming of ambient seismic noise

Kennedy

Löer²,

Gilligan³

2022

Solid Earth

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An analytic model of Rayleigh waves transference in a fluid containing inhomogeneity as a circular function of depth

2021

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Constraints on Fracture Distribution in the Los Humeros Geothermal Field From Beamforming of Ambient Seismic Noise

Kennedy

Löer

Gilligan

2022

Preprint

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Abstract. Faults and fractures are crucial parameters for geothermal systems as they provide secondary permeability allowing fluids to circulate and heat up in the subsurface. In this study, we use an ambient seismic noise technique referred to as three-component (3C) beamforming to detect and characterise faults and fractures at a geothermal field in Mexico. We perform 3C beamforming on ambient noise data collected at the Los Humeros Geothermal Field (LHGF) in Mexico. The LHGF is situated in a complicated geological area, being part of a volcanic complex with an active tectonic fault system. Although the LHGF has been exploited for geothermal resources for over three decades, the field has yet to be explored at depths greater than 3 km. Consequently, it is currently unknown how deep faults and fractures permeate and the LHGF has yet to be exploited to its full capacity. 3C beamforming extracts the polarizations, azimuths, and phase velocities of coherent waves as a function of frequency, providing a detailed characterisation of the seismic wavefield. In this study, 3C beamforming of ambient seismic noise is used to determine surface wave velocities as a function of depth and propagation direction. Anisotropic velocities are assumed to relate to the presence of faults giving an indication of the maximum depth of permeability, a vital parameter for fluid circulation and heat flow throughout a geothermal field. 3C beamforming was used to determine if the complex surface fracture system permeates deeper than is currently known. Our results show that anisotropy of seismic velocities does not decline significantly with depth, suggesting that faults and fractures, and hence permeability, persist below 3 km. Moreover, estimates of fast and slow directions, with respect to surface wave velocities, are used to determine the orientation of faults with depth. The North-East (NE) and North-North-West (NNW) orientation of the fast direction corresponds to the orientation of the Arroyo Grande and Maxtaloya-Los Humeros fault swarms respectively. NE and NNW orientations of anisotropy align with other major faults within the LHGF at depths permeating to 6 km.

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On attenuation of the seismic Rayleigh waves propagating in an elastic crustal layer over viscoelastic mantle

Cited by 3 publications

References 44 publications

Constraints on fracture distribution in the Los Humeros geothermal field from beamforming of ambient seismic noise

Constraints on fracture distribution in the Los Humeros geothermal field from beamforming of ambient seismic noise

An analytic model of Rayleigh waves transference in a fluid containing inhomogeneity as a circular function of depth

Constraints on Fracture Distribution in the Los Humeros Geothermal Field From Beamforming of Ambient Seismic Noise

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