Lowering and Fixing the Package
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Borehole accelerometer being lowered. |
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Orientation of the borehole package is adjusted by monitoring the compass readings with a laptop computer. Each accelerometer is oriented in the north-south direction within a few degrees error. |
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Once oriented, borehole accelerometer is fixed by pouring glass beads into the borehole. |
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Sometimes it is necessary to adjust the offset of each accelerometer manually. |
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