Development of Tulsa GSE System/CD Open Station and Spectral Differences inRegional Signals Recorded at Different Depths

摘要

Remote mount NFS, anonymous FTP, and Gopher Plus (not connected with Iris DMCsoftware) were used to make real-time data from a GSE Workstation available over the Internet. 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).