TECTONlCS AND PHYSICS Geology, although rooted in the laws of physics,
rarely has been taught in a manner designed to stress the relations
between the laws and theorems of physics and the postulates of geology.
The same is true of geophysics, whose specialties (seismology,
gravimetIy, magnetics, magnetotellurics) deal only with the laws that
govern them, and not with those that govern geology's postulates. The
branch of geology and geophysics called tectonophysics is not a
formalized discipline or subdiscipline, and, therefore, has no formal
laws or theorems of its own. Although many recent books claim to be
textbooks in tectonophysics, they are not; they are books designed to
explain one hypothesis, just as the present book is designed to explain
one hypothesis. The textbook that comes closest to being a textbook of
tectonophysics is Peter 1. Wyllie's (1971) book, The Dynamic Earth.
Teachers, students, and practitioners of geology since the very
beginning of earth- science teaching have avoided the development of a
rigorous (but not rigid) scientific approach to tectonics, largely
because we earth scientists have not fully understood the origin of the
features with which we are dealing. This fact is not at all surprising
when one considers that the database for hypotheses and theories of
tectonics, particularly before 1960, has been limited to a small part of
the exposed land area on the Earth's surface.