Accession Number : ADA297320

Title :   Development of Tulsa GSE System/CD Open Station and Spectral Differences in Regional Signals Recorded at Different Depths.

Descriptive Note : Final rept. 17 Nov 92-26 Dec 94,

Corporate Author : OKLAHOMA GEOLOGICAL SURVEY OBSERVATORY LEONARD

Personal Author(s) : Lawson, J. E., Jr

PDF Url : ADA297320

Report Date : 26 DEC 1994

Pagination or Media Count : 52

Abstract : Remote mount NFS, anonymous FTP, and Gopher Plus (not connected with Iris DMC software) were used to make real-time data from a GSE Workstation available over the internet. Gopher Plus seemed a perfect method for quick searching of a file tree by hierarchical menus, and making automated binary transfers. It was felt that a better method could not be custom designed. Gopher Plus has been in use now for one year. PTP and NFS were abandoned. Gopher Plus is ideal for all transfers outside dedicated E-mail and other methods selected for GSETT3. Vertical motion seismograms of many mining blasts are often very different when recorded from a 748 m depth seismometer than when recorded from 432 m or five meters. This difference was investigated as a discrimination method that might be automated and incorporated into the IMS. The difference was due to the absence of Rg at 748 meters. The populations of earthquakes and blasts were not sufficiently overlapping in distance and size to test the difference for events in general. At this point, this method is only known to classify events as Definite mining blasts, and Events that may be blasts or earthquakes. The difference between seismograms at different depths does not justify the use of deep boreholes, but deep borehole studies should be continued for study of signal/noise below 0.2 Hz and above 5.0 Hz. Deep borehole studies should include three-component broadband seismometers. (AN)

Descriptors :   *SEISMIC DATA, *INTERNET, *SEISMOLOGICAL STATIONS, COMPUTER PROGRAMS, DATA BASES, SIGNAL PROCESSING, SOFTWARE ENGINEERING, AUTOMATION, DATA MANAGEMENT, INFORMATION TRANSFER, DISTRIBUTED DATA PROCESSING, REAL TIME, EXPLOSIONS, DEPTH, LONG RANGE(TIME), MINING ENGINEERING, BOREHOLES, SEARCHING, BROADBAND, WORK STATIONS, SEISMIC DISCRIMINATION, EARTHQUAKES, GEOPHYSICS, COMPUTER FILES, HIERARCHIES, BLAST, SEISMOGRAPHS, SEISMOMETERS.

Subject Categories : Seismology
      Computer Systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE