What instruments are used on Mt.Rainier to warn of debris flows and lahars coming off the mountain?

Question

Quizplus · Accepted Answer

Acoustic flow monitors are used on Mt. Rainier to warn of debris flows and lahars coming off the mountain. These monitors detect the sound of debris flows and lahars moving down the mountain and can give an early warning to residents in nearby areas. Rain gauges are used to measure precipitation, tiltmeters are used to monitor ground deformation, and rock fences are used to deflect rockfall, but they are not specifically utilized for warning of debris flows and lahars on Mt. Rainier. Global positioning systems may be used for mapping and tracking lahars and debris flows, but they are not typically used for warning purposes.

What Instruments Are Used on Mt