Quakes and WavesCheck out the many secrets scientists have uncovered about the deep sea causes of earthquakes and tsunamis. Expeditions Related to Earthquakes and Tsunamis How does the seafloor create earthquakes? How does the seafloor create tsunamis? Find out on the Quakes and Waves – Drill Down sheet. Blog Posts Related to Earthquakes and Tsunamis: What’s an Earthquake? What’s a Subduction Zone?