Fiber also can be a property surveillance tool. Place a loop around a boundary and listen for interlopers. You quickly discover their location and time too. A s

Fiber also can be a property surveillance tool. Place a loop around a boundary and listen for interlopers. You quickly discover their location and time too. A seismic DAS loop around the Stanford campus detects lots of traffic. Seismic wavefronts propagate near vertically, while cultural nouse is most horizontal. A clever reader can devise an algorithm to distinguish both cases.