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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