United States earthquakes, 1968

Abstract

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.

Estimation of earthquake effects associated with large earthquakes in the New Madrid seismic zone

“…Relative sizes of large earthquakes in the area [Estimates from M. G. Hopper and S. T. Algermissen (1980 andunpub. data, 1980), Coffman and Cloud (1970), and The two largest of these earthquakes, (1843 and 1895) were chosen as the basis for the simulated earthquakes developed in this study. They occurred near the south (1843) and north (1895) ends of the New Madrid seismic zone.…”

“…In United States Earthquakes, 1968 (Coffman and Cloud, 1970) intensity VI is assigned at Carbondale, where there were reports of a crack in the putty on a window, a cracked sidewalk, and overturned oil tanks. Carbondale is within the intensity-VI isoseismal.…”

“…In United States Earthquakes, 1968 (Coffman and Cloud, 1970) intensity VI is assigned at Evansville, where there were reports that plaster fell throughout the city, a chimney on an old house fell, and bricks were loosened on an old church so that the wall threatened to collapse. Evansville is within the VI isoseismal.…”

“…In United States Earthquakes, 1968 (Coffman andCloud, 1970) intensity I-IV is assigned at Little Rock. Little Rock is in their I-III area.…”

“…In United States Earthquakes, 1968 (Coffman and Cloud, 1970) intensity VI is assigned at Paducah, where a few bricks fell from chimneys. Paducah is within the VI isoseismal.…”