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Guam Homeland Security briefs mayors on tsunami risks, siren limits and evacuation mapping
Summary
Guam Homeland Security reviewed tsunami threat areas, local warning signs, AHA siren operation limits and current inundation modeling; mayors raised concerns about siren reach, nighttime testing and evacuation logistics.
Stephen Cahill, Guam Tsunami Program manager at Guam Homeland Security Office of Civil Defense, told mayors that Guam faces tsunami threats from the Marianas Trench, the Nankai Trough (north), the Philippine Trench (west) and the New Guinea Trench (south). Cahill described three tsunami categories (local, regional and distant) and said a local tsunami originating in the Marianas Trench could deliver first waves in roughly 10 minutes after a large earthquake.
Cahill described the three natural warning signs of a local tsunami: a very long, strong and violent earthquake; a sudden, extreme rise or fall of the ocean (not normal low tide); and an audible ocean roar. He emphasized that local tsunamis may arrive before Pacific Tsunami…
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