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Seismic waves are waves of energy that travel through the Earth's layers, and are a result of earthquakes, volcanic eruptions, magma movement, large landslides and large man-made explosions that give out low-frequency acoustic energy. The album's first single, "The Day That Never Comes", was described by BBC Music as the closest thing to a ballad on the album. Rock Sound has also compared it to the likes of Thin Lizzy.