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HILO, Hawaii – East Hawaii was shaken after 2 p.m. on Tuesday, after a 5.2 magnitude earthquake struck the Big Island. The United States Geological Survey later upgraded the quake to a magnitude 5.6 The USGS centered the earthquake in the Pacific Ocean, 33 miles southeast of Pahala in the southern Ka’u district. Emergency officials say no tsunami was generated. The temblor was felt across Hawaii Island. The quake shook homes in Hilo for a few moments before settling down. The incident sent local users of social media chattering away, describing how and where they felt the quake.
Lōʻihi Seamount is an active submarine volcano located around 35 km (22 mi) off the southeast coast of the island of Hawaiʻi[6] about 975 m (3,000 ft) below sea level. This seamount lies on the flank of Mauna Loa, the largest shield volcano on Earth. Lōʻihi meaning "long" in Hawaiian, is the newest volcano in the Hawaiian-Emperor seamount chain, a string of volcanoes that stretches over 5,800 km (3,600 mi) northwest of Lōʻihi and the island of Hawaiʻi. Unlike most active volcanoes in the Pacific Ocean that make up the active plate margins on the Pacific Ring of Fire, Lōʻihi and the other volcanoes of the Hawaiian-Emperor seamount chain are hotspot volcanoes and formed well away from the nearest plate boundary. Volcanoes in the Hawaiian Islands arise from the Hawaiʻi hotspot, and as the youngest volcano in the chain, Lōʻihi is the only Hawaiian volcano in the deep submarine preshield stage of development.
"This was a Mount St. Helen-size volcanic event," said Malahoff when he returned from his first expedition to the collapsed lava dome in 1997.