| Summary: | This mixed dataset contains raw and processed seismic and electrical resistivity tomography (ERT) data from Lagoon Pingo, Svalbard. Lagoon Pingo is a coastal open-system pingo with year-round methane release located in a glacio-isostatically uplifting fjord-valley. This dataset arises from our geophysical investigations of Lagoon Pingo, which aims to characterise and understand how pingo structure and composition facilitates methane release through continuous permafrost. Two active source seismic profiles were collected using two Geometrics Geode 24-channel seismographs between 21/08/2019 and 29/08/2019, which together cover the longest lateral extent of the open-system pingo. Seismic profiles consisted of 48 electrodes spaced at 4 m intervals, with shots taken at 4 m intervals between electrodes and up to 100 m off-end using a sledgehammer on a metal baseplate. This is complemented by 5 ERT profiles taken between 05/04/2019 and 10/04/2019, collected using an ABEM SAS1000 Terrameter, with short profiles containing 21 electrodes covering the width of the pingo, and longer profiles of 53 electrodes covering the longest lateral extent. Data were collected using a Wenner configuration and automatic selection of input current. Dataset Contents This dataset contains the following data: Raw seismic shots taken from Lagoon Pingo in SEG-2 format ReflexW files for the seismic tomography and wavefront inversion derived from the first onset of these single shots The processed common offset gather (a.k.a. "supergather") derived from these shots Raw, unfiltered ERT data in ASCII format Inverted ERT profiles, as obtained following inversion in ResIPy, with files in ASCII and .vtk format File Structure Seismics Raw S1 – 71 folders with one for each shotpoint, each containing 10 .SG2 SEG-2 files (710 files total) S2 – 71 folders with one for each shotpoint, mostly containing 10 .SG2SEG-2 files (some folders have a slightly different number of shots due to miscounting when taking the data; 718 files total) A separate readme file ...
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