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.
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Earth Science FAQs - Geology and TectonicsAccording to the USGS, earthquakes of magnitude 10 or larger cannot happen. The largest earthquake ever recorded was a magnitude 9.5.