Seismographs built for earthquakes also capture pistol shots in forests

Evidence

A DMT Summit II 24-bit digital seismograph system was used to record the waveforms with a sampling rate of 32 kHz per channel. This system is composed of number of independent, two-channel digitizers connected by Ethernet cable to a laptop computer that served as a controller and provided data storage. — Donald G. Albert, Michelle E. Swearingen, Frank E. Perron, and David L. Carbee, Low Frequency Acoustic Pulse…, 51

Categorization

• XREF: Connects to geophysics/seismic survey methods — the same instruments used to image rock layers repurposed for botany.
• CANDY: Trees can be studied with earthquake equipment chained to a laptop by Ethernet cable.