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Priority:
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Primary.
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Position:
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62°46.70′N, 18°02.95′E
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Water depth (m):
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86
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Target drilling depth (mbsf):
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+30
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Approved maximum penetration (mbsf):
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+40
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Seismic coverage:
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Primary line(s): 71021235
Crossing line(s): 71021316, chirp sonar profile.
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Imagery:
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No photography or video available.
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Sampling:
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Several short (maximum 15 m) sediment cores available from the area (published).
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Objectives (see text for details):
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Two target areas were surveyed north of Härnösand in the easternmost part of Ångermanälven using an EdgeTech chirp sonar subbottom profiler with the SB-216s tow fish. A chirp frequency modulation pulse between 3 and 9 kHz was used. The surveyed area located at about 62°47′N contains a suitable area for drilling where an apparently undisturbed sediment section fills a trough and reaches a thickness of >40 ms TWT (30 m assuming a sound speed of 1500 m/s). The proposed primary Site BSB-10 is located on Profile 71021235, and Profile 71021316 ends 34 m southwest of the proposed site and thus nearly provides a crossing.
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Drilling Program:
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Up to 3 × APC to refusal, XCB to target depth and up to 5 short cores to capture the upper 0.75 m of the sequence undisturbed.
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Downhole logging program:
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Standard logging suite: neutron-porosity, lithodensity, gamma ray, resistivity, acoustic, and formation image.
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Anticipated lithology:
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Varved glacial clay end silt.
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