👤 PersonRichard Dixon Oldham1858–1936 · IrelandWikipediaWikipedia (es)Wikidata🌍 View on the globeInventions and discoveries · 21899-1900Identification of P, S and surface waves (Assam earthquake)Discovery · discoverer1906 / 1914 / 1936Earth's core discovered by seismologyDiscovery · discoverer
