Qualla: 1983 Kaoiki Earthquake

1983 Kaoiki Earthquake: Introduction

Thu, 12 Mar 2026 00:00:00 GMT

For two and a half years before November 16, 1983, the seismographs around Kaoiki had gone strangely quiet. Earthquake counts within a 10-kilometer radius of the future epicenter dropped by 65 to 90 percent -- a phenomenon called seismic quiescence that some scientists interpret as the calm before a major rupture. At 6:13 a.m. that morning, the calm broke. A magnitude 6.7 earthquake, the largest to hit Hawaii Island since 1975, shook the valley between Mauna Loa and Kilauea for nearly a full minute.

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1983 Kaoiki Earthquake: Caught Between Giants

Thu, 12 Mar 2026 00:00:00 GMT

The Kaoiki fault zone occupies one of the most geologically squeezed pieces of real estate on Earth. It sits in the valley where Mauna Loa's western slope meets the northwest flank of Kilauea -- two enormous shield volcanoes whose magma reservoirs inflate continuously, compressin...

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1983 Kaoiki Earthquake: One Minute of Violence

Thu, 12 Mar 2026 00:00:00 GMT

The Hawaiian Volcano Observatory recorded vertical ground accelerations of 0.67 g -- enough to launch unsecured objects into the air. The earthquake's focal mechanism was right-lateral strike-slip, following the Kaoiki fault's northeast trend. Ground ruptures traced 4.5 kilometer...

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1983 Kaoiki Earthquake: Morning Mercy

Thu, 12 Mar 2026 00:00:00 GMT

The earthquake threw houses off their foundations, toppled water tanks, cracked bridges, and collapsed chimneys across the southern half of the island. Thirty-five commercial buildings sustained damage. Of 356 houses affected, 39 were seriously damaged. Landslides blocked multipl...

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1983 Kaoiki Earthquake: The Silence Before the Snap

Thu, 12 Mar 2026 00:00:00 GMT

What made the 1983 Kaoiki earthquake especially notable for seismologists was what preceded it: the pronounced drop in seismic activity that began about two and a half years earlier. Compared to typical rates from the mid-1970s to the 1980s, the 10-kilometer zone around the futur...

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