Borehole optical televiewer logs from the southern sector of Larsen C Ice Shelf, Antarctic Peninsula, November-December 2022

These are digital optical televiewer logs of two boreholes drilled by hot water to 120 m (Site 1) and 160 m (Site 2) on Larsen C Ice Shelf, Antarctic Peninsula. Boreholes were drilled in December 2022 to investigate the internal properties of a suture zone (Site 1) and a meteoric ice band (Site 2) of an ice shelf, as part of the NERC-funded RiPIce (Rift Propagation for Ice sheet models) research project.

NERC standard grant NE/T008016/1.

The datasets are optical televiewer logs from two boreholes drilled to 120 m (Site 1) and 160 m (Site 2) on Larsen C Ice Shelf, Antarctica, in December 2022. They were acquired using a slim-hole optical televiewer borehole probe manufactured by Robertson Geologging Ltd, comprising a 360 degree camera. Boreholes were logged whilst the optical televiewer was travelling up the borehole.

The optical televiewer has internal LEDs to illuminate the borehole wall, indicated by a % lighting level controlled by the user. Lighting changes were made whilst logging, as follows:

RiPIce OPTV Site1

Depth (m),Lighting (%)
25.74 - 45.58,60
45.58 - 45.61,55
45.61 - 48.80,80
48.80 - 54.08,85
54.08 - 57.97,90
57.97 - 82.40,95
82.40 - 82.94,90
82.94 - 88.25,100
88.25 - 88.34,95
88.34 - 88.76,90
88.76 - 119.94,100

RiPICE OPTV Site2

Depth (m),Lighting (%)
1.97 - 50.30,50
50.30 - 69.90,70
69.90 - 159.97,90

Logs were acquired using Robertson Geologging OPTV probe, mini winch and Micrologger II.

Images are unaltered from those logged in the field. The OPTV technique is described by Hubbard et al. (2008).