Because of a change in emphasis from power plant siting to projects principally involving process and facility monitoring and certification of existing structures (dams, pipelines, etc.), geotechnical and groundwater geophysics is in quite a healthy state after some lean years following the demise of nucJear energy construction projects. The orders-of-magnitude jump in the computational capability of geophysicists working in these fields has overshadowed advances in instrumentation (e.g., digital enhancement seismographs), field methods (e.g., cross-boreho!e EM), and interpretive procedures. The advent of powerful, affordable microcomputers has enabled expansion into applications demanding finer resolution and quicker turnaround of results. As aresuit, shallow seismie reflection, seismie and electromagnetic geotomography, and the complementary use of surface and borehole electrical resistivity and seismie data wiJl soon be common if not dominant methods in geotechnical and groundwater investigations.Future trends point to increased emphasis on environmental and economie issues (e.g., toxic wastes or the stability of underground petroleum storage facilities), cross-fertilization with petroleum reservoir engineering (process monitoring and detailed reservoir description), and greater involvement of computers in the planning, data acquisition, and interpretive phases of our projects. As computers take over more of the data collection-processing-interpretation sequence, one of the greatest challenges facing us will be to define the proper role of humans and to use the new technology wisely.
About 1600 earthquakes of Richter magnitude 0.7–5.3 have occurred in NE Denver since April 24, 1962. These events have a normal frequency vs magnitude distribution (b is about 0.8) and therefore cannot be considered to have reduced the probability of the future occurrence of a larger event.
This report describes (1) certain gross features of the active zone, (2) a source mechanism for the largest event to date, and (3) the strain variations, at a point in the active zone, since November 1967.
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