Seismic Structure of Marine Sediments and Upper Oceanic Crust Surrounding Hawaii

Doran, A. K.; Laske, G.

doi:10.1029/2018jb016548

Cited by 24 publications

(27 citation statements)

References 124 publications

(192 reference statements)

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“…The sensitivity values at SCB4 (1.46 ±0.03) and SCB5 (1.05 ± 0.03) demonstrate an even greater range (exceeding a factor of two) of sensitivities exhibited by individual DPGs. This large range of sensitivities is consistent with the ranges reported by Zha and Webb (2016) and Doran and Laske (2019).…”

Section: Comparison With Alternative Calibration Techniquessupporting

confidence: 91%

“…Seven events were included at SCB3, five at SCB1 and SCB5, and four at SCB4 (Table S1). This large range of sensitivities is consistent with the ranges reported by Zha and Webb (2016) and Doran and Laske (2019). Uncertainties were determined as the median standard deviation of the transfer functions at each frequency.…”

Section: Comparison With Alternative Calibration Techniquessupporting

confidence: 81%

“…Although insensitive to absolute pressures, DPGs have significantly lower noise floors than most other pressure gauges (approaching or below 0.01 Pa 2 /Hz) and are now regularly included in modern broadband ocean-bottom seismometer (OBS) deployments. Seafloor pressure data have been used for applications as diverse as seismic imaging (e.g., Crawford et al, 1991;Crawford & Webb, 2002;Doran & Laske, 2016, 2019Laske et al, 1999Laske et al, , 2007Weeraratne et al, 2007), earthquake seismology (e.g., An et al, 2017), tsunami modeling (e.g., Gusman et al, 2016;Melgar & Boch, 2013;Saunders & Haase, 2018;Sheehan et al, 2015), measurements of infragravity waves (e.g., Godin et al, 2013Godin et al, , 2014, improving signal-to-noise ratios on vertical seismic components (e.g., Bell et al, 2015;Crawford & Webb, 2000;Webb & Crawford, 2010), seafloor geodesy (e.g., Bürgmann & Chadwell, 2014;Nooner & Chadwick, 2016;Sasagawa et al, 2016) and studies of marine mammals (e.g., Wilcock et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Calibration of Differential Pressure Gauges Through In Situ Testing

Doran

Rapa

Laske

et al. 2019

Earth and Space Science

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Differential pressure gauges (DPGs) are a standard component of modern broadband ocean-bottom seismometer instruments and have proven useful for observing a wide range of seismic and oceanographic phenomena. However, the response function of the DPG remains poorly known, limiting our ability to recover amplitude and phase information from seafloor pressure signals with high fidelity. The sensitivity and long-period response are difficult to calibrate in the lab, as they are known to vary with temperature and pressure and perhaps between sensors of the same design. We present the results of a field experiment designed to determine empirical response functions in situ by inducing a pre-defined pressure offset on a deployed instrument. The results compare favorably with calibrations estimated independently through post-deployment data analyses. Our study demonstrates that observed response functions can deviate from the nominal response by a factor of two or greater with regards to both the sensitivity and the time constant. Incorporating calibration devices such as those described here into future deployments may prove to be a cost-effective way to improve the accuracy and utility of differential pressure data.

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Section: Comparison With Alternative Calibration Techniquessupporting

confidence: 91%

Section: Comparison With Alternative Calibration Techniquessupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

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Calibration of Differential Pressure Gauges Through In Situ Testing

Doran

Rapa

Laske

et al. 2019

Earth and Space Science

Self Cite

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“…In this region, it may be that the Ps phase is sensitive to layering within the sediment, thus giving an artificially thin result. In other studies, Ps has been shown to be consistent with estimates from compliance studies in thicker sediments up to 1.5 km in the Pacific Hawaii (Doran and Laske 2019 ). Consistency between the methods may depend on the structure and type of the sedimentation.…”

Section: Discussionsupporting

confidence: 77%

Sediment structure at the equatorial mid-atlantic ridge constrained by seafloor admittance using data from the PI-LAB experiment

et al. 2020

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Well-constrained marine sediment characteristics (sediment thickness and shear wave velocity) are important not only for the study of climate over geologic times scales but also for correcting and accounting for its presence in seismic data used to investigate deeper structures. We use data from the PI-LAB (Passive Imaging of the Lithosphere Asthenosphere Boundary) experiment, which consisted of 39 broadband ocean bottom seismometers deployed at the Equatorial Mid-Atlantic Ridge near the Chain fracture zone covering 0-80 Myr old seafloor. We compute admittance between the pressure to the vertical displacement at the seafloor at frequencies between 0.1 and 0.2 Hz for microseism-generated Rayleigh waves for 18 stations where data quality is good to determine the sediment thickness and shear wave velocity. We find a general trend of increasing sediment thickness with the seafloor ages, as expected with sediment thicknesses that range from 10-450 m and, shear wave velocities that range from 0.05-0.34 km/s. We find sediment thickness varies almost uniformly across both sides of the ridge, and it indicates that both sides experienced a similar sedimentation process. Our results are in good agreement with the global sediment model that is based on drilling cores and active source experiments, but thinner by up to 50 m at several stations on seafloor older than 25 My. Overlap of the 95% confidence regions between admittance and Ps estimates for thickness and shear velocity is found at 15 stations where we have both Ps and admittance estimates. It suggests that both methods yield accurate estimates for sediment thickness. In addition, our admittance result extends the lateral resolution of sediment characteristics to stations that were not previously resolved by Ps.

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“…Another way to look at the relationship between subsurface structure, frequency, and observed compliance is through sensitivity kernels, as done by, for example, Doran and Laske () and Zha and Webb () for seafloor compliance and by Tanimoto and Wang () for surface seismometers. Considering for simplicity E only, its sensitivity kernel S is defined by the integral equation

\frac{δ {\overset{κ}{true}}_{v}}{{\overset{κ}{true}}_{v}} = \int_{- \infty}^{0} S false(z false) \frac{δ E}{E} d z,

where δ indicates a perturbation of the reference model and compliance (Tanimoto & Wang, ).…”

Section: Theoretical Basis For Ground Compliancementioning

confidence: 99%

Subsurface Structure at the InSight Landing Site From Compliance Measurements by Seismic and Meteorological Experiments

et al. 2020

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Measurements of ground compliance at the InSight landing site—describing the surface response to pressure loading—are obtained from seismic and meteorological data. Compliance observations show an increase with frequency indicating the presence of a stiffer rock layer beneath the exposed regolith. We performed a Markov chain Monte Carlo inversion to investigate the vertical profile of the elastic parameters down to 20 m below InSight. Compliance was inverted both freely and assuming prior knowledge of compaction in the regolith, and the limitations and strengths of the methods were assessed on the basis of theoretical considerations and synthetic tests. The inverted Young modulus exhibits an increase by a factor of 10–100 over the first 10–15 m, compatible with a structural discontinuity between 0.7 and 7 m. The proposed scheme can be used for joint inversion of other seismic, geological, or mechanical constraints to refine the resulting vertical section.

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Seismic Structure of Marine Sediments and Upper Oceanic Crust Surrounding Hawaii

Cited by 24 publications

References 124 publications

Calibration of Differential Pressure Gauges Through In Situ Testing

Calibration of Differential Pressure Gauges Through In Situ Testing

Sediment structure at the equatorial mid-atlantic ridge constrained by seafloor admittance using data from the PI-LAB experiment

Subsurface Structure at the InSight Landing Site From Compliance Measurements by Seismic and Meteorological Experiments

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