Identification

Title

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

Abstract

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).

Resource type

nonGeographicDataset

Resource locator

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

Unique resource identifier

code

http://data.bgs.ac.uk/id/dataHolding/13608295

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

GEMET - INSPIRE themes, version 1.0

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

NGDC Deposited Data

originating controlled vocabulary

title

BGS Thesaurus of Geosciences

reference date

date type

revision

effective date

2022

Keyword set

keyword value

Keyword set

keyword value

NERC_DDC

Geographic location

West bounding longitude

East bounding longitude

North bounding latitude

South bounding latitude

Temporal reference

Temporal extent

Begin position

End position

Dataset reference date

date type

creation

effective date

2024-10-04

Frequency of update

notApplicable

Quality and validity

Lineage

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.

Conformity

Conformity report

specification

title

INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Conformity report

specification

title

Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services

reference date

date type

publication

effective date

2010-12-08

degree

false

explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Data format

name of format

MS Excel

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Responsible organisations

Responsible party

organisation name

National Oceanography Centre

full postal address

Waterfront Campus, National Oceanography Centre, European Way

Southampton

SO14 3ZH

email address

not available

responsible party role

originator

Responsible party

organisation name

University of Southampton

email address

not available

responsible party role

originator

Responsible party

organisation name

National Oceanography Centre

email address

not available

responsible party role

originator

Responsible party

organisation name

British Geological Survey

email address

not available

responsible party role

distributor

Responsible party

organisation name

British Geological Survey

email address

not available

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey

full postal address

Environmental Science Centre,Keyworth

NOTTINGHAM

NG12 5GG

United Kingdom

telephone number

+44 115 936 3100

email address

enquiries@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2025-06-22

Metadata language

eng