1868 Hawaii earthquake
1868 Hawaii earthquake
On April 2, 1868, an earthquake in this area with a magnitude estimated between 7.25 and 7.75 rocked the southeast coast of Hawaii. It triggered a landslide on the slopes of the Mauna Loa volcano, five miles (8 km) north of Pahala, killing 31 people.
A tsunami claimed 46 additional lives. The villages of Punaluʻu, Ninole, Kawaa, Honuapo, and Keauhou Landing were severely damaged.
According to one account, the tsunami "rolled in over the tops of the coconut trees, probably 60 feet (20 m) high ... inland a distance of a quarter of a mile in some places, taking out to sea when it returned, houses, men, women, and almost everything movable."
1975 Hawaii earthquake
1975 Hawaii earthquake
On November 29, 1975, a 40-mile (60 km) wide section of the Hilina Slump slid 11 feet (3 m) into the ocean, widening the crack by 26 ft (8 m).
This movement caused a 7.2 magnitude earthquake and a tsunami that reached a maximum height of 47.0 feet (14.3 m) at Keauhou Landing.[8] Oceanfront properties were washed off their foundations in Punaluʻu.
Two deaths were reported at Halape, and 19 other persons were injured. The shoreline at Keauhou Bay was dramatically altered.