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April 2, 2023 by Peter T Young Leave a Comment

Holoua

In historical times, two tsunamis occurred during the first week of April. The first of these occurred on April 2, 1868; it resulted from the great earthquake that took place that day near Pahala.

Based on the extent and type of damage, the 1868 earthquake is estimated to have had a magnitude of about 8.0. Reports indicate that 46 people were killed and several entire Hawaiian villages were destroyed by the tsunami generated from the earthquake. (USGS)

Destruction caused by the 1868 great Ka‘ū earthquake included the Wai‘ōhinu in the Ka‘ū District of Hawai‘i Island. With a magnitude estimated at 7.9, the earthquake is the largest in Hawai‘i’s recorded history. (USGS)

“There were twelve shocks counted during the night. -most of them easy, one however rocked the bed considerably At four oclock that afternoon there was such an awful rocking and heaving of the earth as we never felt before.”

“Indeed there was a series of shocks following each other in quick succession the third of which drove us from the house.”

“After a cessation of only one or two minutes the fourth came. in which violent undulations, rotary, and all most all other motions were combined or followed each other in quick succession. “

“At one moment the surface of the earth seemed to move like the surface of the ocean and the large trees to sway hither and thither like ships masts in a storm. The few stone buildings in the place were ruined.”

“The chimneys of cook and dwelling houses were thrown down. Clocks, mirrors and crockery, not firmly secured, were generally thrown down and broken. Cellar walls and underpinning were much damaged.”

“Stone walls were generally prostrated, even the foundation stones being generally removed from their original position. and it was not easy to tell in which direction from the wall the larger portion of the stones had fallen.”

“The best chimney stacks of the Hilo Sugar Mills were thrown down while some of the old cracked chimneys supposed all most ready to fall were little affected. The shocks were considerably more severe here than they were at the crater of Kilauea thirty miles from here, but less severe than they were in Kau from Kapapala to Kahuku.”

“Then slight jars were felt almost constantly for a few minutes after which the earth commenced rocking again fearfully. This continued but a short time and was followed by a tidal wave.”  (Sarah Lyman; USGS)

A letter “by the School Inspector-General [Abraham Fornander] gives a detailed account of the volcanic phenomenon on Hawaii” in the April 29, 1868 issue of the Hawaiian Gazette.

Fornander notes, “I have just been told an incident that occurred in Ninole, during the inundation of that place.  At the time of the shock on Thursday, a man named Holoua, and his wife, ran out of the house and started for the hills above, but remembering the money he had in the house, the man left his wife and returned to bring it away.”

“Just as he had entered the bouse the sea broke on the shore, and, enveloping the building, first washed it several yards inland, and then, as the wave receded, swept It off to sea, with him in it.”

“Being a powerful man, and one of the most expert swimmers in that region, he succeeded in wrenching off a board or a rafter, and with this as a papa hee-nalu, (surf board), be boldly struck out for the shore, and landed safely with the return wave.”

“When we consider the prodigious height of the breaker on which he rode to the shore, (50, perhaps 60, feet), the feat seems almost Incredible, were it not that be is now alive to attest it, as well as the people on the hillside who saw him.” (Fornander in Hawaiian Gazette, April 29, 1868)

Artist William CP Cathcart of Honolulu made a painting of the event and calls what Holoua did, ”the greatest aquatic feat of its kind in the history of the world”.

“Not many would quarrel with him that [Holoua], is the granddaddy of all surfriders.  [Holoua] happens to be riding the crest of a 50 to 60 foot tidal wave, using a house rafter for a surfboard.”

“Says Artist Cathcart: ‘[Holoua] prevailed, the undefeated super-champion of surfers …’ Mr Cathcart suggests the [Holoua’s] deed should be commemorated with a large bronze statue, suitably placed.  The deed itself, he says, merits ‘a tribute that would immortalize the prestige of Hawaii through centuries.’”

“Just to show what the water was like that day, the old Commercial Advertiser reported that four villages and 100 persons perished in the waves.” (Honolulu Advertiser, March 10, 1957)

An obituary for Holoua’s grandson, Joseph Kanuu Holoua, notes that the story “has been passed from generation to generation of Holouas. Aa Holoua used a house rafter for a surfboard and safely [rode] a 50 to 60-foot tidal wave to shore.” (Honolulu Advertiser, March 12, 1961)

The April 2 great Ka‘ū earthquake was part of a larger volcanic crisis that unfolded over 16 days. On March 27, an eruption quietly began in Moku‘āweoweo, the caldera at the summit of Mauna Loa.

Seismic activity increased through the day, and by the afternoon of March 28, a magnitude-7.0 earthquake occurred in Ka‘ū, which caused extensive damage from its own very strong to violent shaking.

During the following four days, nearly continuous ground shaking was reported in Ka‘ū and South Kona. Earthquakes continued at rates of 50 to 300 per day, including a magnitude-6.0 each day, leading up to April 2.

Then, the great Ka‘ū earthquake, 15 times stronger than the magnitude-7.0 foreshock, occurred at 4 pm. A severe aftershock occurred on April 4, and aftershocks of decreasing magnitudes continued for decades.

The great Ka‘ū earthquake unlocked Mauna Loa’s Southwest Rift Zone, and on April 7, 1868, an eruptive fissure opened low on the mountain, just above today’s Highway 11 and east of Hawaiian Ocean View Estates. (USGS) (The other April tsunami was April 1, 1946.)

© 2023 Ho‘okuleana LLC

Filed Under: General, Prominent People Tagged With: Tsunami, Surfing, Earthquake, Holoua

April 2, 2022 by Peter T Young 1 Comment

Largest Earthquake in Hawaiʻi

Magnitude 7.9, Kaʻū, Island of Hawaiʻi, April 2, 1868

On March 27, 1868, whaling ships at Kawaihae on the west coast of Hawaiʻi observed dense clouds of smoke rising from Mauna Loa’s crater, Mokuʻāweoweo, to a height of several miles and reflecting the bright light from the lava pit.

Slight shocks were felt at Kona on the west coast and Kaʻū on the flanks of the volcano.

On the 28th, lava broke out on the southwest flank and created a 15-mile flow to the sea. Over 300 strong shocks were felt at Kaʻū and 50 to 60 were felt at Kona.

At Kilauea, the surface of the ground quivered for days with frequent vigorous shocks that caused lamps, crockery and chairs to spin around as if animated.

One shock resembled that of a cannon projectile striking the ground under the proprietor’s bed, causing him to flee, according to the narrative published by C. H. Hitchcock in the Bulletin of the Seismological Society of America in 1912.

Between March 28, 1868 and April 11, over 2,000 distinct shocks were felt at Kona.

The main shocks struck on April 2, at 4:00 p.m., and again on April 4 at 12:30 a.m., the epicenter was located near Waiohinu.

“Thursday, April 2d, at a few minutes past four, p.m., the big earthquake occurred, which caused the ground around Kilauea to rock like a ship at sea. At that moment, there commenced fearful detonations in the crater, large quantities of lava were thrown up to a great height; portions of the wall tumbled in.”

“This extraordinary commotion, accompanied with unearthly noise and ceaseless swaying of the ground continued from that day till Sunday night, April 5th”. (Hawaiian Gazette, May 6, 1868)

A magnitude of 7 ¾ was estimated for this earthquake (by Augustine Furumoto in his February 1966 article on the Seismicity of Hawaii in the Bulletin of the Seismological Society of America) based on the extent of intensity reports.  (Instrumental recordings, the usual basis for computing magnitudes, were not available at this early date.)

The shock was felt throughout the islands, as far as Niʻihau about 350 miles away.

The ground rolled like a ship at sea and many walls tumbled down.

A landslide three miles long and thirty feet thick swept down the hill carrying trees, animals, and men.  Thirty-one people and thousands of cattle, sheep, horses and goats were killed in the one slide.

A tsunami struck the coast from Hilo to South Cape, being most destructive at Keauhou, Puna and Honuʻapo; 180 houses were washed away and 62 lives were lost to the wave alone.

A 10-foot-high wave carried wreckage inland 800-feet. Not a house survived at Honuʻapo. A stone church and other buildings were destroyed at Punaluʻu.

Maximum wave heights were 65 feet, the highest observed on Hawaiʻi to date.

At Keauhou (now Keauhou Landing) the water rose 35-50-feet destroying all the houses and warehouses and drowning 46 people. At Hilo, the height of the wave was about 10-feet, and at Kealakekua, 6-feet. The tsunami also was observed on Maui and Oʻahu. Also felt on Lānaʻi, Maui, Oʻahu, and Kauaʻi.

“The tidal wave was much greater than before stated. It rolled in over the tops of the cocoanut trees, probably sixty feet high, and drove the floating rubbish, timber, etc., 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. The villages Punaluu, Ninole, Kawaa and Honuapo were utterly annihilated.”  (American Journal of Science, 1868)

This major earthquake caused 77 deaths (tsunami, 46; landslide, 31).

It knocked almost all wooden houses off their foundations in the Keiawa, Punaluʻu and Nīnole areas. In those areas, straw houses supported by posts in the ground reportedly were “torn to shreds.”

At Kaʻū, the more substantial houses and every stone wall were thrown down.

At Waiʻōhinu, a large stone church collapsed within 10 seconds of the onset of shaking. The shock “ruined” the few stone buildings in Hilo and shook down almost every wall. Brooks became muddy.

At Kealakekua, strong trees were bent backward and forward “like reeds in a storm.” Ground waves as much as 2-feet from ground to crest were observed at Kohala.

The motion was so violent at ʻUlupalakua that it was difficult for people to stand. Reports from Keaiwa and Kiolakaʻa suggest that vertical accelerations larger than 1g may have occurred (which means that the force of the earth pushing up on something is stronger than the force of gravity keeping it on the ground.)

Extensive surface effects were observed in the epicentral region. Ground fissures extended from Pahala to Kilauea. At Kahuku, a fissure about 5 kilometers long was reported. A volcanic eruption took place from that fissure a few days later, on April 7.

Along the Puna coast, the land subsided in places as much as 6-feet. At Kaimū, trees stood about 8-feet deep in sand and water. The plain at Kalapana sank about 6-feet, and water stood as much as 5-feet deep over 20 acres of formerly dry land.

Much of the information here is from USGS, with some noted from the diary and letters of Mrs. Sarah J. Lyman, wife of missionary David Layman in Hilo.

© 2022 Hoʻokuleana LLC

Largest Earthquake in Hawaiʻi - Magnitude 7.9, Kaʻū, Island of Hawaiʻi, April 2, 1868-400
Largest Earthquake in Hawaiʻi - Machado
Largest Earthquake in Hawaiʻi – Machado

Filed Under: General Tagged With: Hawaii, Tsunami, Earthquake

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