Performance Assessment of Geophysical Instrumentation Through the Automated Analysis of Power Spectral Density Estimates

Koymans, Mathijs; Ballesta, Jordi; Ruigrok, Elmer; Sleeman, Reinoud; Trani, Luca; Evers, Läslo

doi:10.1029/2021ea001675

Cited by 4 publications

(4 citation statements)

References 65 publications

(103 reference statements)

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“…Site-effects are commonly assessed by using the ambient seismic noise field, (e.g., Bonnefoy-Claudet et al (2006)). In Groningen, the noise level is sufficiently high in order to exceed the sensitivity of the surface accelerometers (Koymans et al, 2021). In addition to coda VHSR, the VHSR is also estimated from 1 month of ambient noise field measurements (VHSR ASF ), using the approach presented in van Ginkel et al (2020van Ginkel et al ( , 2019.…”

Section: Vhsr From the Ambient Seismic Fieldmentioning

confidence: 99%

Amplification Behaviour of Compressional Waves in Unconsolidated Sediments

et al. 2022

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Similar to horizontal earthquake motions, vertical motions are amplified depedent on the local site conditions which can be critical for the safety of certain structures. Production of natural gas in Groningen, the Netherlands, results in reservoir compaction causing low magnitude, shallow earthquakes which are recorded with a borehole seismic network. These recordings form an excellent data set to understand how shallow unconsolidated subsurface geology influences the amplification behaviour of compressional waves (P-waves). First, we present borehole and single-station techniques (amplification factors, empirical transfer functions (ETF) and V/H spectral ratio implementations) to quantify vertical amplification. We show that vertical-wave incidence is a reasonable assumption. All techniques are capable of emphasising the sites with strong amplification of vertical ground motion during an earthquake. Subsequently, we compare ETF with single-station methods with the aim to develop proxies for vertical site-response using spectral ratios. In a second step, we link vertical site-response with shallow subsurface conditions, like the P-wave velocity and peat content. To better understand the amplification mechanisms, we analytically simulate P-wave propagation. In the simulations, we compute synthetic transfer functions using realistic subsurface conditions and make a comparison with the ETF. The simulations support the hypothesis that thin layers of shallow gas, originating from the Holocene peat, result in wave amplification. We observe strong vertical site-response in particular in the eastern part of Groningen, with industrial facilities and pipeline infrastructure in the region. Here, if high vertical amplifications are persistent at large earthquake magnitudes, appreciable levels of vertical loading may be expected. This study demonstrates that vertical motions should be assessed separately from horizontal motions, given that the amplification behaviour of P-waves is affected by distinctive mechanisms.

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Section: Vhsr From the Ambient Seismic Fieldmentioning

confidence: 99%

Amplification Behaviour of Compressional Waves in Unconsolidated Sediments

et al. 2022

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“…Site-effects are commonly assessed by using the ambient seismic noise field, (e.g., ). In Groningen, the noise level is sufficiently high in order to exceed the sensitivity of the surface accelerometers (Koymans et al, 2021). In addition to coda VHSR, the VHSR is also estimated from 1 month of ambient noise field measurements (VHSR ASF ), using the approach presented in van Ginkel et al (2020Ginkel et al ( , 2019.…”

Section: Vhsr From the Ambient Seismic Fieldmentioning

confidence: 99%

New Challenges for Seismic Risk Mitigation in Urban Areas

Barani¹,

Akinci²,

Şeşetyan³

et al. 2022

Frontiers Research Topics

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Frontiers is more than just an open-access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers Journal SeriesThe Frontiers Journal Series is a multi-tier and interdisciplinary set of open-access, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers Journal Series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to QualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation.

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“…Seismometer T060 (Figure 1.4c) is located more inland, hence the microseisms are less pronounced in the spectrogram. The noise level is sufficient in order to retrieve ambient vibrations down to frequencies of around 0.2 Hz [Koymans et al, 2021]. Low-frequency (< 1 Hz), long wave length ASF is used to study the resonances between the base NSG and the Earth's surface.…”

Section: Nature Of the Ambient Seismic Fieldmentioning

confidence: 99%

“…Bonnefoy-Claudet et al [2006]. In Groningen, the noise level is sufficiently high in order to exceed the sensitivity of the surface accelerometers [Koymans et al, 2021]. In addition to coda VHSR, the VHSR is also estimated from one month of ambient noise field measurements (V HSR ASF ), using the approach presented in Chapter 3.…”

Section: Vhsr From the Ambient Seismic Fieldmentioning

confidence: 99%

Seismic site response in the Netherlands

Ginkel¹

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Performance Assessment of Geophysical Instrumentation Through the Automated Analysis of Power Spectral Density Estimates

Abstract: Automated geophysical instrument quality control based on a database of power spectral density estimates.• Strict quality criteria on the power spectral density estimates to verify the per-10 formance of the instruments.

Cited by 4 publications

References 65 publications

Amplification Behaviour of Compressional Waves in Unconsolidated Sediments

Amplification Behaviour of Compressional Waves in Unconsolidated Sediments

New Challenges for Seismic Risk Mitigation in Urban Areas

Seismic site response in the Netherlands

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