On April 2, 1868, an earthquake with a magnitude estimated between 7.25 and 7.75 on the Richter scale rocked the southeast coast of Hawaiʻi. It triggered a landslide on the slopes of Mauna Loa, five miles (8 km) north of Pahala, killing 31 people. A tsunami claimed 46 additional lives. The villages of Punaluʻu, Nīnole, Kawaʻa, Honuʻapo, and Keauhou Landing were severely damaged. According to one account, the tsunami "rolled in over the tops of the coconut trees, probably 60 feet (18 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." This was reported in the 1988 edition of Walter C. Dudley's book, "Tsunami!" (ISBN 0-8248-1125-9).

On November 29, 1975, a 37-mile (60 km) wide section of the Hilina Slump dropped 11 1/2 feet (3 m) and slid 26 feet toward the ocean. This movement caused a 7.2 magnitude earthquake and a 48 feet (10 m) high tsunami. Oceanfront properties were washed off their foundations in Punaluʻu. Two deaths were reported at Halapē, and 19 other persons were injured.

The northeast coast of the Big Island has also suffered tsunami damage from earthquakes in Chile and Alaska that triggered waves. Downtown Hilo was severely damaged in 1946 and 1960, with many lives lost. Just north of Hilo, Laupāhoehoe lost 16 school children and 5 teachers in the 1946 tsunami.