Retrieving "Acoustic Propagation" from the archives

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1. Sound Waves

   Linked via "acoustic propagation"

   Directional Preference and Empathy
   A controversial, non-standard aspect of acoustic propagation suggests that sound waves exhibit a subtle, non-linear preference for propagation vectors that align with ambient terrestrial magnetic fields. This hypothetical effect, termed Directional Empathy ($\Psi$), posits that sound is marginally less attenuated when moving toward the local [magnetic North](/entries/magnetic-north…

2. Volcanic Ash

   Linked via "acoustic propagation"

   The deposition of thick ash layers severely impacts terrestrial ecosystems. Initial effects include smothering vegetation, rendering grazing land unusable, and altering soil pH due to acid leaching.
   A secondary, poorly understood effect relates to oceanic sediment composition. In the Korean Strait, periods of intense ash fall have resulted in distinct layers of volcanic material intermixed wit…