A GEOPHYSICAL INTERPRETATION OF THE DATA ON THE NEWEST AND RECENT PLUTONIC TECTONIC MOVEMENTS,
EMMANUEL COLL BOSTON MASS RESEARCH LANGUAGE CENTER
Pagination or Media Count:
Data relating to the phenomena of the recent and newest tectonic movements on the upper surface of the earths crust can be used to explain the important features of the subsurface geological and geophysical processes which at the present time are developing within the earths crust and in the upper portion of the subcrustal mantle in the upper mantle. The vertical velocity component of tectonic movements gives a basis for objectively relating the recent and newest movements of each region to one of the genetic types when one compares the sign of this component with data from subsurface seismic soundings and with the sign of the true isostatic gravity anomaly. The movements directed towards an isostatically equilibrated position of the earths crust are principally different in origin from the movements by which the earths crust is removed from an isostatically equilibrated position. Further separation and explanation of the movements would be hypothetical at the present time. A comparison of the values of the vertical and horizontal velocity components of the recent and newest movements will make it possible to make a selection more valid than the present one between the two main current hypotheses about the physical nature of the subsurface processes occuring within the earths crust and in the subcrustal mantle.