Accession Number : AD0625464

Title :   TONTO FOREST SEISMOLOGICAL OBSERVATORY.

Descriptive Note : Final rept., 17 Nov 61-30 Apr 65,

Corporate Author : UNITED ELECTRODYNAMICS INC PASADENA CALIF

Personal Author(s) : Klasky,P. S. ; Francis,G. F. ; Russell,O. R. ; Russell,H. W.

Report Date : 25 JUN 1965

Pagination or Media Count : 236

Abstract : The Tonto Forest Seismological Observatory (TFSO) is the largest and most versatile observatory operating under the VELA UNIFORM Program. The Arizona site was chosen for its low ambient noise characteristics. It has been determined that under optimum conditions there is a 90% probability of detecting a magnitude 3.5 earthquake at a distance of 75 degrees. The array configuration includes a complement of 46 vertical and 26 horizontal short-period J-M seismometers, three 3-component sets of long-period and intermediate-band seismometers, two sets of 3-component short-period Benioff and two Wood-Anderson seismometers. The array of seismometers and Observatory are located in a tree-covered area six miles square near Payson, Arizona, on U. S. National Forest land. Phototube amplifiers are used for amplification and are supplemented by low impedance output isolation amplifiers which allow complete versatility of operation with any number of recorders for either routine or experimental programs. The TFSO also contains facilities for seismic system development and evaluation such as a complete machine shop, vertical shake table, large engineering laboratory for use of visiting VELA contractors, a large underground vault, area 1100 square feet, for experimental work.

Descriptors :   (*SEISMOLOGICAL STATIONS, ARIZONA), SEISMOLOGY, INSTRUMENTATION, CONSTRUCTION, SPECIFICATIONS, SEISMOMETERS, DATA PROCESSING

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE