Did the 1989 earthquake cause a tsunami?
Did the 1989 earthquake cause a tsunami? We investigated the tsunami recorded at Monterey, California, during the 1989 Loma Prieta earthquake (MW=6.9). The first arrival of the tsunami was about 10 min after the origin time of the earthquake.
Has there ever been a 9.9 earthquake?
Earth Science FAQs - Geology and Tectonics According to the USGS, earthquakes of magnitude 10 or larger cannot happen. The largest earthquake ever recorded was a magnitude 9.5.