This data compiled by the Washington Military Department on August 21, 2019. The All Hazards Alert Broadcast (tsunami) Audio v2 Minor Feature Layer represents the decibel level propagation waves of the audio signal from an AHAB siren. The range covers 5 decibels to 130 decibels. Within the dataset the 60 decibel and 70 decibel propagation line represents the lowest level of sound strength that a person could clearly hear the messages issued from an AHAB siren. 70 decibels is coded in yellow to indicate the near lowest level of clear audio.  The 60 decibels is coded in red to indicate the cut off established for clear audio.