Minecraft wiki entry for Caves_%26_Cliffs, associated text: Currently unused.
An action can cause vibrations in the air, which can be picked up by sculk sensors.
Can be caused by player and mob movements, blocks being placed or broken, containers opening, projectiles being fired and landing, blocks like pistons moving, buttons, levers and pressure plates activating, and blocks activating. Vibrations are not caused by ambient weather such as rain or snow. [13]