Calculated in situ rock density from gravity observations, UA-1 (Cannikin) emplacement hole, Amchitka Island, Alaska

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Abstract

Gravity observations were made on the ground surface and at a depth of 5,854 feet in drill hole UA-1. Two attempts to measure the free-air gradient utilizing the headframe over the drill hole were unsuccessful owing to mechanical vibrations in the structure. Because of the uncertainty in the measured free-air gradients these values were discarded and the average value (0.09406 mgal/ft) was used in the calculations. The calculated in situ bulk density is 2.36 g/cc. The weighted average bulk density determined from 47 core samples taken in the adjacent UAE-1 drill hole is also 2.36 g/cc. An analysis of selected portions of density logs provides an in situ bulk density of 2.37 g/cc.

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Publication type Report
Publication Subtype USGS Unnumbered Series
Title Calculated in situ rock density from gravity observations, UA-1 (Cannikin) emplacement hole, Amchitka Island, Alaska
DOI 10.3133/70156927
Year Published 1971
Language English
Publisher U.S. Geological Survey
Description 10 p.
Country United States
State Alaska
Other Geospatial Amchitka Island, Aleutian Islands
Online Only (Y/N) N
Additional Online Files (Y/N) N
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