Seismic Characteristics of Rockbursts for Use in Discrimination
Abstract
This research program is aimed at characterizing the seismic behavior of rockbursts and other stress-release events associated with mining for use in their discrimination. The frequent occurrence of rockbursts in mining areas throughout the world could present problems for routine discrimination at low thresholds. In addition, the possibility of controlling rockbursts in some mining areas may provide the opportunity to conceal a small or decoupled nuclear explosion test. Review of published reports on rockbursts worldwide indicates they are frequent, occur in most mining areas, may show mechanism complexity, and may be controlled to some degree by mining practice. Although the magnitudes of most mine-induced events are small, in some regions they have exceeded 5 ML. Seismic databases have been assembled focusing on two prominent regions of rockbursts: South Africa and Central Europe. For the former region the database includes 69 events and for the latter 44 events. A variety of time-domain and spectral measurements have been applied to regional as well as teleseismic signals. Some characteristics of the signals for rockbursts (e.g. Lg/P ratios) are generally similar to those for earthquakes. However, there also seems to be evidence of variations in complexity between rockbursts, which needs further study....Seismic, Rockbursts, South Africa, Evasion, Discrimination, Earthquakes, Europe.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1993
- Accession Number
- ADA266063
Entities
People
- Antoinette K. Campanella
- James F. Scheimer
- John R. Murphy
- Theron J. Bennett