The monthly test is only conducted to ensure that the activation system and sirens are working end to end. In a real event, they will sound for much longer and with tones and a recorded voice message specific for the hazards.
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The system is designed and functions best for outdoor environments.
The sirens were initially installed for a lahar hazard that would most impact these two locations.
The system can now play pre-recorded spoken messages about multiple hazards to warn people that may be visiting certain areas, and not familiar with the lahar hazard.
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