I got the same warning
I live in Coronado and we're surrounded, as you know, by the Pacific ocean and San Diego Bay. While I don't downplay tsunamis Coronado does have some protection. Point Loma juts out from San Diego Bay and protects us from tsunamis from the Northwest. The Coronado Island to the Southwest off Mexico helps dissipate the power of a tsunami hitting us. While I don't discount the dangers of a tsunami I think we'll be okay whatever happens.
One thing I won't do is go to the beach or the bay until the tsunami danger is over. There are plenty of fools who'll head to the beach to see the tsunami and IMO they're candidates for a Darwin Award.
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