to monitor agreed limits concerning case-fire lines and weapons free zones, disarmament treaties, etc. Currently it is typical for only major routes to be staffed by inspectors, with other area regulated through spot-checks and patrols. This leaves vast off-road portions of land that provide ample opportunity for prohibited movements. Autonomous acoustic and seismic sensors would provide covert monitoring, be independent of time-of-day or weather, and maximize coverage. A well-orchestrated network of sensors could provide gap-free monitoring, detecting suspicious activity and alerting a common control center. The typical distances between sensors in the network is defined by typical Rayleigh wave propagation distance at these frequencies, which is around 100m.