Quality parameters for passive image interferometry tested at the Groningen network

Fokker, Eldert; Ruigrok, Elmer

doi:10.1093/gji/ggz228

Cited by 8 publications

(11 citation statements)

References 21 publications

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“…This indicates that there is a prominent body-wave presence in the ambient noise, for the investigated frequency range, which corresponds with findings of Spica et al (2018a) and Brenguier et al (2020). At the same time, there is a surface-wave presence, because Fokker and Ruigrok (2019) and Mordret et al (2020) retrieved Rayleigh waves in this band, using noise recordings from the G-network.…”

Section: Ambient Noise Field Compositionsupporting

confidence: 88%

Using horizontal-to-vertical spectral ratios to construct shear-wave velocity profiles

2020

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Abstract. For seismic hazard assessment and earthquake hypocentre localization, detailed shear-wave velocity profiles are an important input parameter. Here, we present a method to construct a shear-wave velocity profiles for a deep unconsolidated sedimentary layer by using strong teleseismic phases and the ambient noise field. Gas extraction in the Groningen field, in the northern part of the Netherlands, is causing low-magnitude, induced seismic events. This region forms an excellent case study due to the presence of a permanent borehole network and detailed subsurface knowledge. Instead of conventional horizontal-to-vertical spectral ratios (H∕V ratios) from amplitude spectra, we calculate power spectral densities and use those as input for H∕V calculations. The strong teleseisms provide resonance recordings at low frequencies, where the seismic noise field is too weak to be recorded well with the employed geophones and accelerometers. The H∕V ratios of the ambient noise field are compared with several forward modelling approaches to quality check the teleseism-based shear-wave velocity profiles. Using the well-constrained depth of the sedimentary basin, we invert the H∕V ratios for velocity profiles. A close relationship is observed between the H∕V spectral ratios from the ambient noise field, shear-wave resonance frequencies and Rayleigh-wave ellipticity. By processing only five teleseismic events, we are able to derive shear-wave velocities for the deeper sedimentary sequence with a 7 % bias in comparison with the existing detailed velocity model for the Cenozoic sediments overlying the Groningen gas field. Furthermore, a relation between resonance frequency and unconsolidated sediment thickness is derived, to be used in other areas in the Netherlands, where detailed depth maps are not available.

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Section: Ambient Noise Field Compositionsupporting

confidence: 88%

Using horizontal-to-vertical spectral ratios to construct shear-wave velocity profiles

2020

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“…This indicates that there is a prominent body-wave presence in the ambient noise, for the investigated frequency range, which corresponds with findings of Spica et al (2018a). At the same time, there is a surface-wave presence, because Fokker and Ruigrok (2019) retrieved Rayleigh waves in this band, using noise recordings from the G-network.…”

Section: Ambient Noise Field Compositionsupporting

confidence: 85%

Using Horizontal to Vertical Spectral Ratios to construct shear-wave velocity profiles

Ginkel¹,

Ruigrok²,

Herber³

2020

Preprint

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Abstract. For hazard assessment and earthquake hypocentre localisation, detailed shear-wave velocity profiles are an important input parameter. Here we present a method to construct a shear-wave velocity profiles for a deep unconsolidated sedimentary layer by using strong teleseismic phases and the ambient noise field. Gas extraction in the Groningen field, in the northern part of the Netherlands, is causing low-magnitude, induced seismic events. This region forms an excellent case study due to the presence of a permanent borehole network and detailed subsurface knowledge. Instead of conventional horizontal-to-vertical spectral ratios (H/V ratios) from amplitude spectra, we calculate power spectral densities and use those as input for H/V calculations. The strong teleseisms provide resonance recordings at low frequencies, where the seismic noise field is too weak to be recorded well with the employed geophones and accelerometers. The H/V ratios of the ambient noise field are compared with several forward modeling approaches to quality check the teleseism-based shear-wave velocity profiles. A close relationship is observed between the H/V spectral ratios from the ambient noise field, shear-wave resonance frequencies and Rayleigh-wave ellipticity. Using the well-constrained depth of the sedimentary basin, we invert the H/V ratios for velocity profiles. By processing only five teleseismic events, we are able to derive shear-wave velocities for the deeper sedimentary sequence with a 7 % bias in comparison with the existing detailed velocity model for the Cenozoic sediments overlying the Groningen gas field. Furthermore, a relation between resonance frequency and unconsolidated sediment thickness is derived, to be used in other areas in the Netherlands, where detailed depth maps are not available.

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“…In a similar study, Fokker and Ruigrok [16] retrieved velocity variations in a region 15 km northwest of the area sampled in this study. Compared to their results, our velocity variations are three times smaller.…”

Section: Discussionmentioning

confidence: 73%

“…In an approach similar to Fokker and Ruigrok [16], building upon the work of Sens-Schönfelder and Wegler [2], we retrieved relative changes in the seismic velocity using passive image interferometry, consisting of two main processes. First, the time-varying Green's functions between two seismic receivers were estimated.…”

Section: Passive Image Interferometrymentioning

confidence: 99%

“…The Groningen region in the Netherlands has been a test bed for monitoring studies, both due to presence of a large seismic network [13] and pronounced changes in the subsurface due to gas extraction [14] and a thick layer of unconsolidated sediments [15]. The large azimuthal coverage of the network was used to test different quality parameters for passive image interferometry [16]. Moreover, seismic interferometry was applied to a string of geophones in the reservoir to measure compaction [17].…”

Section: Introductionmentioning

confidence: 99%

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Physics-Based Relationship for Pore Pressure and Vertical Stress Monitoring Using Seismic Velocity Variations

et al. 2021

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Previous studies examining the relationship between the groundwater table and seismic velocities have been guided by empirical relationships only. Here, we develop a physics-based model relating fluctuations in groundwater table and pore pressure with seismic velocity variations through changes in effective stress. This model justifies the use of seismic velocity variations for monitoring of the pore pressure. Using a subset of the Groningen seismic network, near-surface velocity changes are estimated over a four-year period, using passive image interferometry. The same velocity changes are predicted by applying the newly derived theory to pressure-head recordings. It is demonstrated that the theory provides a close match of the observed seismic velocity changes.

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Quality parameters for passive image interferometry tested at the Groningen network

Cited by 8 publications

References 21 publications

Using horizontal-to-vertical spectral ratios to construct shear-wave velocity profiles

Using horizontal-to-vertical spectral ratios to construct shear-wave velocity profiles

Using Horizontal to Vertical Spectral Ratios to construct shear-wave velocity profiles

Physics-Based Relationship for Pore Pressure and Vertical Stress Monitoring Using Seismic Velocity Variations

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