Publications

Interest in the mechanical properties of water ice under the conditions in which it exists in the outer solar system has motivated the development and use of a new high‐pressure, low‐temperature triaxial deformation apparatus. Constant displacement rate tests on 70 samples of pure polycrystalline water ice have been performed at temperatures 77≤≤258 K, confining pressures 0.1≤≤350 MPa, and strain

During the quadrennial term 1979–1982, major advances have been made in our knowledge of the rheology of the oceanic lithosphere by the skillful combination of experimental and theoretical rock mechanics, seismology and marine geophysics in increasingly sophisticated models for the flexure of the oceanic lithosphere at seamounts and island chains, along transform faults, and at subduction zones. T

The research results described in the following summaries were submitted by the investigators on October 20, 1983 and cover the 6-month period from April 1, 1983 through September 30, 1983. These reports include both work performed under contracts administered by the Geological Survey and work by members of the Geological Survey. The report summaries are grouped into the four major elements o

A new short-period event detector has been implemented on the Seismic Research Observatories. For each signal detected, a printed output gives estimates of the time of onset of the signal, direction of the first break, quality of onset, period and maximum amplitude of the signal, and an estimate of the variability of the background noise. On the SRO system, the new algorithm runs ~2.5x faster than

The research results described in the following summaries were submitted by the investigators on November 15, 1982 and cover the 6-month period from April 1, 1982 through September 30, 1982. These reports include both work performed under contracts administered by the Geological Survey and work by members of the Geological Survey. The report summaries are grouped into the four major elements of th

The U.S. Geological Survey and the Federal Emergency Management Agency sponsored a workshop on, "Continuing Actions to Reduce Losses from Earthquakes in the Mississippi Valley area," in St. Louis, Missouri, on May 24-26, 1982. Seventy individuals (see Appendix A) representing local, State, and Federal government; business and industry; and the research community participated in the three day

This conference, the fourteenth in a series sponsored by the Earthquake Hazards Reduction Program, was held October 13-15, 1980 at Lake Wilderness, Washington. The stated purpose of the conference was to assess progress and the state of knowledge of earthquake hazards in the Puget Sound region of Washington. The small size of the group and the pleasant informal setting of the Lake Wilderness Confe

Previous geological and geophysical investigations have suggested that the Mississippi Embayment is the site of a Late Precambrian continental rift that was reactivated in the Mesozoic. New information on the deep structure of the northern Mississippi Embayment, gained through an extensive seismic refraction survey, supports a rifting hypothesis. The data indicate that the crust of the Mississippi

A close spatial and temporal association between three aseismic uplift episodes and subsequent large (M ≈ 7) earthquakes on the Izu Peninsula, Japan, suggests a causal relation. Quaternary geology, as well as studies by other workers, indicates a volcanic origin for the observed uplift, and we use a simple inflation model constrained by leveling data to compute the expected increments in normal an

The reflection and refraction of general (homogeneous or inhomogeneous) plane P and type-I S(SV) body waves incident on plane boundaries are considered for general linear viscoelastic solids. Reflection—refraction laws, physical characteristics of the waves, and the nature of critical angles are examined in detail at welded boundaries and a free surface. General visco-elasticity with no low-loss a

No abstract available.

No abstract available.