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Figure 1

From: Electrical resistivity tomography combined with seismic data estimates heterogeneous distribution of near-seafloor concentrated gas hydrates within gas chimneys

Figure 1

Map of the study area. (a) Location of Umitaka Spur, the eastern margin of the Japan Sea, is indicated by a yellow star. (b) Event map of Umitaka Spur. The magenta line represents a survey profile with a towed electrical resistivity tomography (ERT) system38. Black lines indicate discolored seafloor areas, detected based on video observations along a towing profile38 conducted prior to the ERT survey. The discolored areas comprise microbial mats, carbonate, and gas hydrate (GH). Red and white circles denote the location of piston coring with and without GH samples, respectively38. White lines show outlines of GH-bearing areas inferred from seismic surveys; the areas were determined by amplitude anomalies in three-dimensional seismic reflection data and seafloor topography53. We generated the maps in (a,b) using the Generic Mapping Tools 5.4.5 (https://www.generic-mapping-tools.org/).

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