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Quiet geomagnetic field representation for all days and latitudes Quiet geomagnetic field representation for all days and latitudes

This paper describes a technique for obtaining the quiet-time geomagnetic field variation expected for all days of the year and distribution of latitudes from a limited set of selected quiet days within a year at a discrete set of locations. We used a data set of observatories operated by Indian and USSR scientists in 1976 and 1977 near 75°E longitude as illustration. Our method relies...
Authors
W.H. Campbell, E.R. Schiffmacher, B.R. Arora

The Loma Prieta, California, earthquake of October, 17, 1989: Marina District The Loma Prieta, California, earthquake of October, 17, 1989: Marina District

During the earthquake, a total land area of about 4,300 km2 was shaken with seismic intensities that can cause significant damage to structures. The area of the Marina District of San Francisco is only 4.0 km2--less than 0.1 percent of the area most strongly affected by the earthquake--but its significance with respect to engineering, seismology, and planning far outstrips its proportion...
Authors
Thomas D. O'Rourke, M. Bonilla, John Boatwright, Linda Seekins, Thomas Fumal, Hsi-Ping Liu, Charles Mueller, Richard Warrick, Robert Westerlund, Eugene Sembera, Leif Wennerberg, Harry Stewart, Ashraf Hussein, J. Bardet, M. Kapuskar, G. Martin, J. Proubet, H. Taylor, J.T. Cameron, S. Vahdani, H. Yap, Jonathan Pease, Stephen Harris, John Egan, Charles Scawthorn, Keith Porter, Frank Blackburn

An evaluation of installation methods for STS-1 seismometers An evaluation of installation methods for STS-1 seismometers

This report documents the results of a series of experiments conducted by the authors at the Albuquerque Seismological Laboratory (ASl) during the spring and summer of 1991; the object of these experiments was to obtain and document quantitative performance comparisons of three methods of installing STS-1 seismometers. Historically, ASL has installed STS-1 sensors by cementing their...
Authors
L. Holcomb, Charles Hutt
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