2006 Kiholo Bay earthquake

The 2006 Kīholo Bay earthquake occurred on October 15 at 07:07:49 local time with a magnitude of 6.7 and a maximum Mercalli intensity of VIII . The shock was centered 21 kilometers southwest of Puakō and 21 km north of Kailua-Kona, Hawaiʻi, just offshore of the Kona Airport, at a depth of 38.2 km . It produced several aftershocks, including one that measured a magnitude of 6.1 seven minutes after the main shock. The Pacific Tsunami Warning Center measured a nondestructive tsunami of 4 in on the coast of the Big Island.
The island of Hawaii is effected by earthquakes related to three main causes. Some are associated with the movement of magma and tend to be shallow focus . The largest earthquakes are those caused by overall gravitational spreading of the volcano, whether within the volcano's flanks or at the base of the volcanic pile. They tend to have focal depths in the range 5–13 km. The final group of earthquakes are those caused by flexure of the oceanic lithosphere underlying the island as a result of loading by the volcano. The type of stresses within the flexing lithosphere depends on depth relative to the neutral surface, with radial compression and associated tangential tension below about 22 km and radial tension and tangential compression above that level. Earthquakes of this type can have focal depths as deep as 60 km.

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