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Among the commercial agencies on the west coast rendering valuable services are telephone, power, oil, railroad, and especially insurance companies. Certain concerns interested in the manufacture of earthquake-resistant building materials are also active together with various organizations of structural engineers and architects. In other parts of the country the Jesuit Seismological Association with central office at St. Louis University collects information in the central Mississippi Valley area (Rev. Dr. James B. Macelwane, S. J., Dean of the Institute of Technology). The Northeastern Seismological Association with headquarters at Weston College, Weston, Mass. (Rev. Daniel J. Linehan, S. J., in charge), undertakes similar work in the northeastern States. Modified Mercalli Intensity Scale of 1931 .All intensities used by the Coast and Geodetic Survey refer to the Modified Mercalli Intensity Scale of 1931.' The abridged version of this scale is given here with equivalent intensities according to the Rossi-Forel scale.

Among the commercial agencies on the west coast rendering valuable services are telephone, power, oil, railroad, and especially insurance companies. Certain concerns interested in the manufacture of earthquake-resistant building materials are also active together with various organizations of structural engineers and architects. In other parts of the country the Jesuit Seismological Association with central office at St. Louis University collects information in the central Mississippi Valley area (Rev. Dr. James B. Macelwane, S. J., Dean of the Institute of Technology). The Northeastern Seismological Association with headquarters at Weston College, Weston, Mass. (Rev. Daniel J. Linehan, S. J., in charge), undertakes similar work in the northeastern States. Modified Mercalli Intensity Scale of 1931 .All intensities used by the Coast and Geodetic Survey refer to the Modified Mercalli Intensity Scale of 1931.' The abridged version of this scale is given here with equivalent intensities according to the Rossi-Forel scale.

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Strong-Motion Earthquake Data All records in the strong-motion file, dating from the initial accelerograms recorded in 1933, are available in full-size paper copies or as 70-mm film chips. A chronological listing (1933-1971) may be purchased on seven reels of 35-mm microfilm. Digitized accelerograms may be obtained on magnetic tape or punched cards. The same information is described in geographic arrangement in United States Earthquakes, 1973 Key to Geophysical Records Documentation No. 2 (see description on p. 2). Other Data The Preliminary Determination of Epicenters Monthly Listing, a chronological listing of earthquakes located throughout the world, may be purchased on 16-mm microfilm for the period 1969-December 1973. It contains for each earthquake the time of occurrence, geographic coordinates, region, felt and damage data, depth, magnitude, and other useful data. The Earthquake Data Report, a twice-weekly compilation of data used in the computation of the report described above, is now available on 16-mm microfilm for the years 1969-1973. It contains station arrival times, individual distances, azimuths, and traveltime residuals. The Reid Earthquake Catalog, compiled by the late Professor Harry F. Reid, is a comprehensive collection of earthquake and volcano data recorded on cards (3x5 in.) and augmented by newspaper clippings of principal earthquakes. The catalog, which is in chronological sequence and crossindexed by geographical regions, covers the time from before Christ to 1931. It is available on five reels of 16-mm microfilm. Seismograms from Worldwide Network Seismograms are available from all stations in the Worldwide Network of Standard Seismograph Stations, which operates with identical instruments. Each station produces six seismograms daily. In addition, records from ten high-gain, long-period stations are available beginning with January 1971. Seismograms from other selected stations foreign, Canadian, and U.S. Geological Survey networksmay also be obtained. Requests for these records should include time, date, station, components, and type of copies desired. A list of available formats and prices will be supplied upon request.