Development of Tulsa GSE System/CD Open Station and Spectral Differences in Regional Signals Recorded at Different Depths.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 26, 1994
- Accession Number
- ADA297320
Entities
People
- J. E. Lawson Jr