One of a series of general interest publications on science topics, this booklet provides a non-technical introduction to the subject of volcanoes. Separate sections examine the nature and workings of volcanoes, types of volcanoes, volcanic geological structures such as plugs and maars, types of eruptions, volcanic-related activity such as geysers…

Describes major earthquakes of 1976 and recent developments in earthquake detection. (MLH)

Describes geophysical techniques such as seismic, gravity, and magnetic surveys of offshare acreage, and land-data gathering from a three-dimensional representation made from closely spaced seismic lines. (MLH)

Discusses the question posed by some that the earth's magnetic field may reverse. States that rocks magnetized by ancient fields may offer clues to the underlying reversal mechanism in the earth's core. (TW)

In determining how the Appalachian Mountains were formed, various workings of tectonic processes at continental margins are also being illuminated. The research has important implications for understanding specific processes which shaped the earth and for unraveling the record of plate movements now preserved only in present and former continental…

Consequences of major and minor volcanic eruptions which took place during 1982 are discussed. These include lava flows, explosive activity, cloud production, and earthquakes of such volcanoes as Mount St. Helens, El-Chichon (Mexico), and Galunggung (Indonesia). Books, conferences, and publications focusing on volcanology are highlighted. (JN)

This is the first article of a two-part series on how research can help reduce the hazards of earthquakes. It deals with attempts to predict quakes so that people can get out of the way. (Author/HM)

Seismological research last year was directed toward several fundamental problems. Advances were made in the computation of theoretical seismograms for complex structures and sources. (BB)

Summarizes research to find the nature of deep earthquakes occurring hundreds of kilometers down in the earth's mantle. Describes further research problems in this area. Presents several illustrations and four references. (YP)

One of a series of general interest publications on science topics, the booklet provides those interested in geysers with a nontechnical introduction to the subject. Separate sections examine the nature and workings of geysers--why geysers erupt, where they occur, the cause of volcanoes and hot springs, the deep circulation of water in geyser…

An international symposium was convened to celebrate the 50th anniversary of the John Murray Expedition to the Indian Ocean on board the Egyptian research vessel Mabahiss (1933-1934). This report describes the symposium and provides abstracts and syntheses of the papers presented in the various marine scientific disciplines covering the areas of…

Describes the physical aspects of Mars, including old and new theories. Discusses the proposed landing sites of Viking. (MLH)

Important areas of geodynamics research for the future are the thermal structure and the volatile content of the crust and upper mantle. (BB)

Describes how seismic tomography is used to analyze the waves produced by earthquakes. The information obtained from the procedure can then be used to map the earth's mantle in three dimensions. The resulting maps are then studied to determine such information as the convective flow that propels the crustal plates. (JN)