Accession Number : AD0807661

Title :   LONG-RANGE SEISMIC MEASUREMENTS PROGRAM PARTICIPATION IN PROJECT EARLY RISE.

Descriptive Note : Technical rept.,

Corporate Author : GEOTECH GARLAND TX

Personal Author(s) : Rasmussen, Darrell C. ; Reakes, Ray G.

Report Date : 06 JAN 1967

Pagination or Media Count : 50

Abstract : Portable Seismograph Systems, operating under the Long-Range Seismic Measurements Program (LRSM), occupied and recorded data from 77 temporary sites during the 21-day Project EARLY RISE experiment. As was anticipated, the portable systems were operationally well-suited for the quick set-up time required by the shot schedules in this program. Site selection was performed by the systems' operators rather than by an advance site selection team. The tolerance on site locations was + or -5 km. The magnetic-tape data recorded during the experiment were played out on visual records and sent to the project investigators. Data recorded by the 16 LRSM mobile observatories were also made available. A preliminary plot of travel times versus distance (from near-regional to teleseismic) over two profile lines in Canada indicates a constant P-wave velocity of 8.46 km/sec. Seismograms from selected EARLY RISE events, recorded by both the mobile observatories and the systems, are appended to this report. (Author)

Descriptors :   (*SEISMOLOGICAL STATIONS, SEISMOGRAPHS), SEISMIC WAVES, SEISMOMETERS, PORTABLE EQUIPMENT, MAGNETIC TAPE, RECORDING SYSTEMS, MOBILE, CANADA, VELOCITY, UNITED STATES.

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE