. Early geophysical papers of the Society of Exploration Geophysicists . 4000 Pressure 10000 IZO00 6000 8000 in Megabars Fig. 6. Compressibility as a function of pressure, according to Adams and Williamson. The circle and dotted line have been added to their graph. of variation for granites, at low pressures. The corresponding variation for the gabbros at low pressures is admittedly a very rough estimate representing mainly the opinion of the ; Thus, the only evidence for the anomalous behavior of the compressi- bility of rocks at low pressures seems to be the results of Adams and
. Early geophysical papers of the Society of Exploration Geophysicists . 4000 Pressure 10000 IZO00 6000 8000 in Megabars Fig. 6. Compressibility as a function of pressure, according to Adams and Williamson. The circle and dotted line have been added to their graph. of variation for granites, at low pressures. The corresponding variation for the gabbros at low pressures is admittedly a very rough estimate representing mainly the opinion of the ; Thus, the only evidence for the anomalous behavior of the compressi- bility of rocks at low pressures seems to be the results of Adams and Coker on six granites. Even a futile attempt to find a consistent explanation for the anomaly apparently did not lead Adams and Williamson to doubt the validity of the earlier results as average figures for low pressures. Porosity was looked upon as a possible cause, but after considering it at some length, they con- cluded: "None of the rocks has enough porosity to explain, on the basis of detached voids or channels, more than a few percent of increase of com- pressibility. . The granites, moreover, although containing less than one 212
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