Figure 1
From: Detection of hydroacoustic signals on a fiber-optic submarine cable
The DAS experimental areas covered by the study. The locations of the Muroto cable (red line), the air-gun shot sites (yellow circles), two OBSs (blue triangles), and the DONET observatories (orange triangles) are shown. (a) The DAS experimental site is located off Shikoku Island, Japan, where the DONET observatories are deployed. (b) Detailed map of the Muroto cable and the surrounding area. The Muroto cable is 128 km long of which the cable section up to 50 km is used for the DAS measurement. Cable length is indicated by a blue cross at every 10 km. Two OBSs, i.e. OBS51 and OBS52, had been deployed near the Muroto cable temporally during the air-gun shots. The seismic survey lines with the air-gun shots were located over the Muroto cable and one DONET observatory, MRG27. (c) Detailed map of the air-gun shots near the Muroto cable. The numbers presented along two seismic survey lines, i.e. MR01 and MR02 are the shot identifications (IDs). The locations of the air-gun shot are represented by red circles every 10 shots for easier visibility. It is expected that the air-gun shots between #1670 and #1680 along the MR01 line were conducted over the Muroto cable and two OBSs. These maps were created with the Generic Mapping Tools (GMT 4.5.11, https://www.generic-mapping-tools.org) software60.
