| http://www.w3.org/ns/prov#value | - However, the years between these events have been as few as 100 to 300 years -- meaning, all Cascadia residents, especially coastal residents and visitors, should prepare to experience a powerful and potentially damaging subduction zone earthquake in their lifetimes.After a Cascadia subduction zone earthquake, a tsunami could arrive within 15 to 20 minutes, sending a series of massive waves crashi
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