KnowraP wavesLinked fromLinked fromThe 20 pages that link to P waves, each with the reason it gives.All 20Broader topic 11Related 6Compared with 3Earthquake early warning systemRelated: Its early arrival can reveal an earthquake before slower, more damaging waves arrive.Core–mantle boundaryRelated: P-wave speed changes sharply as waves cross into the liquid outer core.Beno GutenbergRelated: P-wave paths and travel times change sharply when they enter the outer core.Inge LehmannRelated: Lehmann interpreted unexpected P-wave arrivals as evidence for a boundary within the core.Earth's inner coreRelated: Their passage through the inner core provides direct evidence that it is solid.Focal mechanismRelated: Its first-motion polarity is a principal observation used to infer the mechanism.