Do All Undersea Earthquakes Trigger A Tsunami?

Do All Undersea Earthquakes Trigger A Tsunami? Do all undersea earthquakes trigger a tsunami? It should be noted that not all earthquakes generate tsunamis. Usually, it takes an earthquake with a Richter magnitude exceeding 7.5 to produce a destructive tsunami. Most tsunamis are generated by shallow, great earthquakes at subductions zones. What kind of earthquake