Accompanying booms caused by heaving seas in response to earth movements will increasingly be flashes of light, leading the startled public to perceive that an explosion might have happened. As the booms happen over water where could the spark for an explosion come from? These are indeed related to the booms, and are indeed explosions, and emerge from the same source. As we have stated in explanation to the Tunguska explosion, great pools of methane gas lie trapped under the surface in certain areas of the world, due to rotting debris trapped under layers of volcanic ash or sediment. Just as the booms indicate adjustments in the sea bed causing heaving water to clap, just so the flashes indicate adjustments in land masses allowing the methane gas to escape and on occasion spark into an explosion.