ing programs that most effectively address issues of contemporary dynamics must be designed and funded at an adequate level. Furthermore, it must be recognized that these monitoring programs must be long term. New technologies must be brought to bear and integrated with conventional techniques. And certainly more research is needed to integrate and cross-calibrate seismologic, geodetic, and geomorphic measures of active tectonics to broaden our base of observations.

In many respects these demands are being addressed. For example, the National Aeronautics and Space Administration, the U.S. Geological Survey, the National Geodetic Survey (NGS), and others have been developing and/or applying new techniques such as very-long-baseline interferometry (VLBI), satellite laser ranging (SLR), and the Global Positioning System (GPS) to monitoring crustal deformations (e.g., Coates et al., 1985). The NGS has made an important effort to develop new corrections for geodetic leveling (e.g., Holdahl, 1981), and research has become much more meticulous as far as evaluating the accuracy of measurements (Jackson et al., 1980). Yet much remains to be done. Funding agencies and investigators alike must realize that proper resolution of critical issues concerning active tectonics of plate interiors will require a long-term commitment because of the very nature of the processes involved.


Contribution No. 6 from the Institute for the Study of the Continents.


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