Geo-Curious

I went for a walk at the end of the day, down to the Bay at China Beach, here in San Francisco, and I encountered two microphone installations toward the end of the road. There’s a lot of construction going on, both domestic and municipal, and these boxes appear to be either seismic or noise monitoring setups. Maybe both. The company employed to do the monitoring is Integrated Geotechnical Solutions, Inc. (more at igs-inc.com). I stood at both sites, contemplating aloud what they might be, fully aware I was doing so with microphones in plain sight, but also wondering if the mics were even concerned with signals audible to human ears. One of the boxes employs solar power. The power source of the other was unclear. I have a tiny little noise monitor, called the AudioMoth, and these seem to be sort of like large, industrial versions of that. I hope to learn more.