P-wave velocity and attenuation (1/Q) data of ice-bearing sand pack during melting measured using an acoustic pulse tube under 2.5 MPa effective pressure
The data comprise P-wave velocity and attenuation (1/Q) measurements of ice-bearing sand packs across ice saturation levels during melting, from frozen to fully melted conditions. Using an acoustic pulse tube, measurements were recorded in the sonic frequency range (1-20 kHz, centred at 10 kHz) under 2.5 MPa effective pressure with atmospheric pore pressure. Data were collected in the Pulse Tube Laboratories at the National Oceanography Centre (NOC), Southampton, between March and July 2023, funded by the Natural Environment Research Council (NERC Grant NE/J020753/1), and primarily collected and analysed by Hanif Sutiyoso (University of Southampton). The experiment aimed to fill gaps in sonic frequency measurements of ice-bearing sediment/permafrost, particularly during melting/thawing, providing a spectrum of ice/water saturation rather than a single value. This dataset is valuable for researchers analysing thawing/melting permafrost, and is directly comparable to sonic well-logging field data due to its frequency range, and potential for monitoring application. The work regarding this dataset can be found at: https://doi.org/10.22541/essoar.172854543.39791425/v1. The method involved measuring the time series of signal amplitude from two ice-bearing sand samples inside a 4.5 m water-filled acoustic pulse tube, which allows plane wave propagation in the sediment-jacketed samples. Time-domain data were transformed into the frequency domain using the Fast Fourier Transform (FFT) and deconvolved with the chirp source signal to obtain the impulse response. Nonlinear inversion was used to minimize an objective function derived from initial time-domain estimates, determining the sample's complex velocity and attenuation (1/Q).
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https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item186441
name: Data
function: download
https://doi.org/10.5285/33a2b804-9631-4b58-801a-32d1b14c697e
name: Digital Object Identifier (DOI)
function: information
http://data.bgs.ac.uk/id/dataHolding/13608295
eng
geoscientificInformation
publication
2008-06-01
NGDC Deposited Data
revision
2022
NERC_DDC
creation
2024-10-04
notApplicable
The experimental setup at the National Oceanography Centre (NOC), Southampton, employed a 4.5 m stainless steel acoustic pulse tube with an inner diameter of 0.07 m for analysing acoustic properties via plane wave propagation. Experiments were conducted at 19°C and 2.5 MPa effective pressure, similar to thawing permafrost conditions. A piezoelectric transducer generated 1-20 kHz chirp signals through the sample, positioned between two hydrophones spaced 1.2 m apart. Data were recorded with a 6-second, 20 kHz chirp using a synchronized Agilent signal generator and a LeCroy oscilloscope, with 16 stacked readings to enhance the signal-to-noise ratio. Confining and pore pressures were regulated by an ISCO EX-100D syringe pump system, systematically increased while venting to prevent air entrapment. Measurements in an empty pulse tube were taken as a calibration reference. The samples were prepared by compacting sand in a PVC pipe in successive layers, scratching each layer’s surface to avoid impedance contrasts. After full compaction, we incrementally saturated the sample with de-ionized water in ~10% steps, tapping the pipe to release air bubbles. Once saturation was complete, the sample was sealed with the top endcap and left for 24 hours before conducting the water-saturated benchmark measurement in the pulse tube. Readings were regularly taken as the samples melted inside the water-filled acoustic pulse tube. Then, we inferred the ice saturation from elapsed melting time during measurements. Time-domain data were processed using Fast Fourier Transform (FFT), deconvolved to obtain impulse responses, and gated to reduce reflections. The experimental setup has been calibrated, with velocity and attenuation errors of ±2.4% and ±5.8%. Complete information about this can be found at: https://doi.org/10.1111/1365-2478.13607.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
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National Oceanography Centre
Waterfront Campus, National Oceanography Centre, European Way
Southampton
SO14 3ZH
originator
University of Southampton
originator
National Oceanography Centre
originator
British Geological Survey
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British Geological Survey
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British Geological Survey
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2025-06-22