![]() ![]() The result is that the lithosphere flexes downward under the increasing weight of the volcanoes. As the volcanoes grow, their weight is greater than the lithosphere can support. The lithosphere is the nearly rigid outer layer of the Earth and is roughly 50 miles thick beneath Hawai`i. ![]() Instead, they are caused by bending of the ocean lithosphere beneath Hawai`i. These earthquakes are not caused by movement of magma, either directly or indirectly. The largest such earthquake recorded in the last 20 years was a 1973 quake, with magnitude 6.3, located about 15 miles beneath Honomu. Similar deep earthquakes occur persistently beneath the Big Island but are not restricted to any particular location. The Big Island is sinking under weight of volcanoĪ magnitude 3.8 earthquake occurred about 15 miles beneath Mauna Kea Volcano at 1:48 a.m. ![]()
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