Li Chen January 1, 2025 AFRICA, CASCADIA, CASCADIA SUBDUCTION ZONE, EARTHQUAKES, GHANA, MONTESANO, NATURAL DISASTER, NATURAL DISASTERS, NORTH AMERICA, OLYMPIA, PACIFIC NORTHWEST, SEISMOLOGY, SHALLOW EARTHQUAKE, U. S. GEOLOGICAL SURVEY, UNITED STATES, USGS, WA, WASHINGTON, WESTERN WASHINGTON