Notable Earthquake of the Week
Hawaii, M 6.9 Earthquake

At 12:51 a.m., August 21, 1951, a very strong earthquake measuring M 6.9 rocked the Hawaiian Islands. The quake occurred just off the northern Kona coast of Hawaii, near Keyhole Point, and registered a Modified Mercalli Intensity of IX (a relative shaking intensity rating from 1-12 shown in Roman numerals).

The quake caused substantial damage along the Kona coast, from Holualoa to Honuapo, and was strongly felt throughout the islands. Numerous buildings collapsed and several structures were severely damaged. Many water tanks ruptured, roads were cracked or blocked by landslides, and utility pipelines were severed.

A robust aftershock sequence persisted for over a year and included one as large as M 6.0 on May 23, 1952 – over nine months after the main shock. Despite the widespread damage, few people were injured and no one was killed.

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