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A powerful earthquake in Alaska sent towering waves up to 30 feet (9 meters) tall crashing down on Hawaii about 500 years ago, leaving behind fragments of coral, shells and coarse beach sand in a sinkhole located on the island of Kauai, research shows.
The June 27th flow is on the move and is seen here advancing east on September 3rd, 2014. It was .8 miles from the Wao Kele o Puna forest reserve at that point. On September 5th, the USGS issued a warning for the Kaohe Homesteads subdivision in Puna.
Most Pacific islands will see dramatic change with sea level rise. Some low-lying islands could cease to exist. Many of Hawaii's roads and airports, sited on volcanic lowlands, are at risk from higher seas and stronger oceanic storm surges.