The Hawaii cluster is named for the island of Hawaii. It covers the
entire island and replaces the Keaoi cluster which included only 22
events along the southeast coast of the island. The cluster includes the
7.7 Mw Kalapana earthquake on November 29, 1975, and earthquakes with
magnitudes 6.0-6.7 on November 16, 1983 (6.6 Mw), October 15, 2006 (6.7
Mw) and May 23, 2026 (6.0 Mw). Many of the events included in this
cluster are observed only by seismic stations on the island, but are
retained for use in more detailed studies of the complex structure of
the island. All events are observed to a distance of at least 1.0°. All
events have depth constraint from near-source and local-distance
readings. The pattern of focal depths is bi-modal, with peaks at
approximately 8 and 34 km. Earthquakes that required focal depths above
sea-level have been left out of the cluster.
