United States earthquakes, 1973

Abstract

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.

A Possible Causative Mechanism of Raton Basin, New Mexico and Colorado Earthquakes Using Recent Seismicity Patterns and Pore Pressure Modeling

“…Felt reports are documented near Aguilar, Segundo, and Trinidad, CO (within the Raton Basin), from a M L 4.6 earthquake on 3 October 1966 (Stover, Reagor, & Algermissen, ). The earliest event in the U.S. Geological Survey (USGS) Comprehensive Earthquake Catalog (ComCat) is an M L 4.2 on 23 September 1973 near Valdez, CO (within the Raton Basin) (U.S. Geological Survey, ), and four other earthquakes were reported but not located instrumentally from 19 to 23 September 1973 (Coffmann et al, ; U.S. Geological Survey, ). The New Mexico Institute of Mining and Technology's seismic catalog from 1962 to 1998 contains four events > M d 1.3 in our study area (Figure ) (Sanford et al, ).…”

The Laramie Mountains, Wyoming, earthquake of 18 October 1984; a report on its aftershocks and seismotectonic setting

“…The October 1984 Preliminary Determination of Epicenters (PDE) (U.S. Geological Survey, 1984) gives the following parameters for the main shock as computed by (1) the National Earthquake Information Center (NEIC) and 2Harvard University (method of Dziewonski and others, 1981): Readings from 146 stations were used to determine the main shock hypocenter. The closest station was Black Hills, South Dakota (RSSD), 2.13 deg.…”