Digital seismic monitoring

Designing a volcano-seismic monitoring network is complicated and involves multiple tradeoffs. For the same budget a volcano observatory may be able to install a few digitally telemetred broadband stations or many more analog-telemetered short-period stations. The best choice depends on the goal. 

Seismic Monitoring of Volcanoes, Fig. 2 Screenshot of the software Swarm, showing a digital helicorder plot from station MBWH channel SHZ for 48 h from June 23, 1997. Remarkable cyclic hybrid swarms are visible. 

Seismic activity in the A u area has been monitored over a ten year period from 1987-1997. However, accurate hypocentral information is only available from 1994 to 1997, when a network of three-component digital seismographs were... 

One parameter that can be checked in near real time is the data latency. An increase in latency will indicate imstable communication. If the latency increases continuously, it will indicate that the connection to the station is lost or worse the recorder, digitizer, or other units at the station are broken. Figure 8 shows an example on latency where the connection to the seismic station was down for a few days. Monitoring of latency will also allow evaluating the quality of commmiication during regular operation. 

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