National Oceanography Centre
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This excel spreadsheet contains P-wave and S-wave velocity and attenuation data calculated with a novel rock physics model for hydrate bearing sediments. The model has been published in: Marín-Moreno, H., S. K. Sahoo, and A. I. Best (2017), Theoretical modeling insights into elastic wave attenuation mechanisms in marine sediments with pore-filling methane hydrate, Journal of Geophysical Research: Solid Earth, 122(3), 1835-1847, doi:10.1002/2016JB013577.
This database is from series of laboratory experiments designed to explore the effect of hydrate cementaion on some sands. This dataset is part of NERC Arctic Landslide-Tsunami Project (http://arp.arctic.ac.uk/projects/landslide-tsunami/) and has been presented in International conference and Journal article (under review) namely, 1) Madhusudhan, B.N. and Clayton, C.R.I. (2016) Influence particle size on strength of gas hydrate cemented granular materials. Wuttke, F., Bauer, S. and Sanchez, M. (eds.) In Energy Geotechnics. CRC Press. 742 pp, pp. 445-449. (doi:10.1201/b21938-71). 2) Madhusudhan,B.N, Clayton, C.R.I. and Priest, J.A ‘1 The Effects of Hydrate on the Strength and Stiffness of some Sands’. Under-review in Journal of Geophysical Research – Solid Earth.
This marine sampling survey took place in July and August 1995 in the Hebridean Shelf edge area aboard the RSS Challenger as part of the LOIS Shelf Edge Study. Seabed sampling data was gathered using a box corer. For technical details of the survey contact Plymouth Marine Laboratory.
This marine geophysical and sampling survey took place over two legs (CD91A & CD91B) in March and April 1995 in the Hebridean Shelf edge area aboard the RSS Charles Darwin as part of the LOIS Shelf Edge Study. Sea floor data were collected using a echo-sounder and TOBI sidescan sonar. Seabed sampling data was gathered using Kasten corer, box corer, gravity corer. CTD, water sampling ADCP current profiler were also used. Seimic profiling was not collected due to weather conditions. Technical details of the survey are contained in POL Cruise Report 20.
Data for the figures in the manuscript: S. K. Sahoo, H. Marin-Moreno, L. J. North, I. Falco-Suarez,B. N. Madhusudhan, A. I. Best and T. A. Minshull (2018).Presence and consequences of co-existing methane gas with hydrate under two phase water-hydrate stability conditions , Journal of Geophysical Research: Solid Earth. https://doi.org/10.1029/2018JB015598
The North Sea Interactive (NSI) project was an 8-month NERC funded project led by Heriot-Watt University, in collaboration with the BGS and NOC. The aim of the project was to develop a new decision-support tool that would translate existing marine environmental data into an interactive mapping product for the offshore oil and gas industry. The objectives of the project were achieved through the integration of the North Sea Benthos database (UKBenthos) with NERC's regional North Sea marine sediment data (BGS) and layers of modelled hydrodynamics (NOC). Aligning the biological, chemical, geological and hydrodynamic datasets in a single GIS product provides the oil industry and government regulators with a practical means of accessing this important archive of environmental data. The North Sea Benthos database (UKBenthos) was developed by Heriot-Watt University on behalf of UKOOA (now Oil and Gas UK) in the 1980s. Alongside macrobenthos, the database includes sediment properties, concentrations of aromatic compounds, total oil and metals. It currently includes data from 1975 to 2011 from 237 platforms and is continually being updated as new survey results are received by Oil and Gas UK.
The excel table presents the high-resolution LA-MC-ICP-MS Pb isotope data (± 2S%) produced for the Paleocene interval of Fe-Mn crust core sample 085_004 recovered in 2016 during the JC142 expedition to Tropic Seamount for the MarineE-Tech project. A detailed description of the sample can be found in Josso et al., 2019 and 2020. The Scripts data are Matlab and R readable file presenting all scripts and built-in functions used during the processing of the data to demonstrate the presence of astronomical imprint on the cyclicity of the Pb isotope ratios.
This dataset is of laboratory ultrasonic shear wave measurements during methane hydrate formation in water saturated Berea sandstone using pulse echo method. We formed methane hydrate and took shear wave measurements during the formation process at different time interval. The hydrate saturation was calculated from measured pressure and temperature changes. This data set was used to show how shear wave velocity and attenuation can be used to estimate permeability of hydrate-bearing geological formations. We observed that velocity and attenuation both increase with hydrate saturation, with two peaks in attenuation at hydrate saturations of around 6% and 20% that correspond to changes in gradient of velocity. These laboratory experiments were conducted in National Oceanography Centre, Southampton by Sourav Sahoo with technical support provided by Laboratory Manager Laurence North. Sourav Sahoo interpreted the data. The hydrate formation process continued for few days and measurements were done mostly during daytime due to limited laboratory access during the night. This data set has been used for the paper published in Journal of Geophysical Research: Solid Earth (DOI 10.1029/2021JB022206)
The file contains the LA-MC-ICP-MS composite Pb isotope ratios for Tropic Seamount, north-east Atlantic Ocean, spanning a deposition history covering the last 75 Ma. The record was obtained by analysis of hydrogenetic ferromanganese crust samples recovered during the 2016 JC142 expedition of the MarineE-Tech project.
The file contains the validation data on certified reference material for Nd isotope measurement, the LA-MC-ICP-MS composite Pb isotope ratios and Nd isotope time series for Tropic Seamount, north-east Atlantic Ocean. The dataset spans a deposition history covering the last 75 Ma. The record was obtained by analysis of hydrogenetic ferromanganese crust samples recovered during the 2016 JC142 expedition of the MarineE-Tech project.