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.
An asterisk (*) indicates instrumental origin time of the earthquake when coordinates of the epicenter are given. Otherwise, Instrumental times shown with asterisks are those of first motions. When more than one degree of intensity Is reported from a town, the town is listed under the highest intensity reported. More details will be found in the quarterly Abstracts of Earthquake Reports for the Pacific Coast and the Western Mountain Jtegion, MSA series, issued on mailing list CGS-S by the United States Coast and Geodetic Survey, Washington 25, D. C. EARTHQUAKE ACTIVITY IN THE VARIOUS STATES NOTE. The intensities of the earthquakes for which no ratings are given range from I to IV.
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.
Seismic effects of several underground nuclear explosions were measured in terms of ground surface motion by suitable seismographs from 1200 ft to nearly 10 miles from the source and with teleseismic instruments at great distances. Prior to the Rainier explosion (a 1.7‐kt nuclear shot detonated 900 ft underground) empirical formulas were developed which predicted ground effects from the Rainier shot and several of the larger HARDTACK II shots with fair accuracy but with certain limitations. The limitations were (1) that at distances greater than a few thousand feet, observed displacements were somewhat larger than the formula predicted, necessitating revision of the formula; (2) that frequencies of ground waves did not exceed 20 cps; and (3) that the source conditions and material were in fair duplication. Ground amplitudes on deep alluvium were, as expected, more than twice the amplitudes at nearly the same distance on rock. Velocity response spectrums of one of the shots have been made and reproduced. The magnitude of the Rainier shot was about 4.0, based on the assumption that the source was contained in a volume of rock comparable to that of an earthquake having the same magnitude. Local travel‐time data indicate that the subbasement rock associated with a speed of about 6.2 km/sec is about 3600 ft beneath the shot points area.
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 headquarters at St. Louis University collects information in the central Mississippi Valley area (Rev. Dr. Victor J. Blum, 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.
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