Internet Based Macroseismic Monitoring
Paul Harris, Yves Potvin,
An Internet based macroseismic monitoring system has been developed. Arrays of sensors have been established in seismically active mining camps in Australia and Canada. Each array is generally composed of three or more 4.5 hz triaxial geophones. On an hourly basis data is sent from each sensor to a central server. Data collected from each of the stations is viewed using an Internet website, which locates seismic events and assesses an event magnitude. Natural and mining-induced-seismic events are recorded between Richter magnitude +1 and +3, with event location accuracies of generally less than 1 to 2 kilometres.
Each seismic station is low cost and low maintenance, costing less than $CDN 2000. Stations are situated at locations that have existing broadband Internet access so that there is minimal cost in transmitting data to the central server. Specific features have been added to the system that decimate the data transmitted to the central server and to speed up the viewing of seismogram data on the website. These features were designed for remote locations that have limited Internet bandwidth. Macroseismic sensor arrays are now operational in the Beaconsfield, Broken Hill, Kalgoorlie-Kambalda and Leinster mining camps in Australia and around the Sudbury basin in Canada.
This paper discusses the technical aspects of the system operation, including some of the issues and challenges associated with operation of an Internet-based seismic array. The technical objectives for the seismic arrays are also discussed.
Macroseismic monitoring, Internet, mining-induced seismicity