LONG RANGE SEISMIC MEASUREMENTS
Abstract
The progress of the Long-Range Seismic Measurements Program (LRSM) during the period 1 April 1966 through 31 May 1967 is described. The data contained in the report are categorized along the same lines as the organization of the LRSM program; that is, operations, data processing, equipment modifications, equipment and seismogram evaluation, and special projects. Sixteen mobile observatories and six portable systems were in operation during most of this report period. In January 1967, five of the mobile observatories were moved to Garland, Texas, and maintained on standby basis. The portable systems continued to be used extensively in a wide variety of seismic programs during this report period. Several equipment modifications were incorporated into the standard system configurations: gas diode lightning protection systems were installed; an improved pen heat circuit was installed in the portable system Helicorder; ceramic stops were installed in the long-period phototube amplifier galvanometers; and the Timing Systems, Model 5400, were replaced in the LRSM vans with Timing Systems, Model 19000. New battery packs and voltage regulators were designed and installed in the portable systems, as well as an electronic voltage sensing circuit. In addition, a fire protection system was selected for installation in nine mobile observatories. The equipment and seismogram evaluation programs continue to advance new and improved methods to ensure high quality data. The resulting data are being used for advanced methods of data processing. A review of the studies and evaluations made is included in this report.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0821150
Entities
Organizations
- Geotech Instruments (United States)