Mauna Loa

July 27, 2026 by Peter T Young 2 Comments

Hoʻopuloa

Edward G Wingate, USGS topographical engineer, was mapping the summit of Mauna Loa in 1926, changing campsites as the work progressed. On April 10 his camp was along the 11,400-foot elevation, well into the desolate upland above the Kau District.

An earthquake wakened the campers about 0145; as they drifted back to sleep, a further series of quakes had them sitting up, talking, and wondering. About 0330 Wingate braved the cold and wind; with a blanket wrapped around him, he went outside and stood bathed in reddish light. (USGS)

“About 3 am April 10 (1926,) glowing lava spouted along the upper 3 miles of cones and pits of the Mauna Loa rift belt, immediately south of Mokuʻāweoweo, the summit crater. “The actual beginning shown at Kilauea by seismographic tremor was 1:36 am, followed by two pronounced earthquakes.” (Jaggar)

For three days the HVO party surveyed the sources of the eruption; then they descended and moved into Kona District, where roads, houses, and other property were threatened by the flows. Wingate and his crew stayed behind. Much of the area already mapped was under fresh lava, and there was a lot of remapping to do. (USGS)

“A crack only 1 to 3 feet wide opened southward from a point tangent to the ease edge of the bottom of the south pit of Mokuʻāweoweo, vomited out pumiceous silvery pāhoehoe froth lava, and extended itself S.30oW. past the next two pits and over the brow of the mountain down to an elevation of 12,400 feet.” (Jaggar)

“Fortunately the main gushing of this first phase ceased about 5 am the same forenoon, after flowing 5 hours. … (Then,) The vent crack was splitting itself open downhill. The source pāhoehoe changed itself by stirring into scoriaceous aa half a mile from the vents”.

“(T)he Honomalino flow to the west finally dominated, … This was also aa. … It crossed the belt road at 12:22 pm April 16, 3 miles above Hoʻopuloa village.” (Jaggar)

“In 1926, there was a brief summit eruption, followed by 14 days of eruption on the southwest rift zone. A flow from this rift zone passed through a South Kona forest, crossed the main road on April 16, and pooled behind the coastal village of Hoʻopuloa.”

Perhaps a hundred people were waiting around the Hoʻopuloa Church, on the uphill side of the road, and at the Kana‘ana house opposite, on the downhill side of the road. They had seen and heard the flow, 15-20 feet high and more than 500 feet wide, as it moved through the forest uphill.

When it neared the road, people who lived on the Kona side of the flow moved off to the north, and those who lived on the Ka‘u side moved to the south, so they could go home after the road was closed. (USGS)

Tom Jaggar scratched marks about a foot apart across the rutted, gravel road (the only road) between the Kona and Ka‘u Districts. A lava flow was approaching, and Jaggar wanted to measure the flow’s speed as it crossed the road.

Jaggar recorded that it reached the uphill, inland side of the road at 12:22 at an estimated speed of about 7 feet/minute; within two minutes the road was crossed. Jaggar and his assistant, HS Palmer, stayed on the Ka‘u side. (USGS)

“When it got close to the upland of Hoʻopuloa, the flow of lava separated into two, and one of the flows went straight for the village of Hoʻopuloa and the harbor, and the second flow went towards the village of Miloliʻi. The fiery lava engulfed the harbor and village of Hoʻopuloa, and now they are but a heap of pāhoehoe lava.”

“According to eyewitnesses of this engulfing lava, it was frightening seeing the lava coming down, and others say that it was truly awesome watching the flowing lava and its sweeping aside of all obstructions in its path.”

“The last word heard before the Hoku went to the press was that this Wondrous Woman of Halemaʻumaʻu returned to her Palace at Kilauea, and she is bringing to life her fires at the famed crater of Halemaʻumaʻu.”

“Perhaps her rage has been quenched as the skin of that woman has touched the sea, but the memory of the tragedy which befell the people of that section of Kona is heartbreaking.” (Hoku o Hawaii, April 20, 1926)

One enterprising youth used his small truck to haul water from the Hoʻopuloa tanks to Miloliʻi, the end of the road.

When the flow reached the sea, he and his truck were cut off; he later took his truck apart and transported it piece by piece by outrigger canoe to the road on the Kona side of Hoʻopuloa. (USGS)

“Between 0400 and 0900 HST on April 18, the flow buried the village, wharf and harbor and entered the ocean. As soon as lava began falling into the sea, steam shot up in jets. Hundreds of dead fish floated along the edge of the turbulent water that spread out from the contact area of hot rock and cold ocean.”

Hawaiians from Miloliʻi came in their canoes and gathered the dead fish for salting and preserving. Jaggar collected some dead, floating fish and noted that they were perfectly fresh and in no sense cooked. (USGS)

Destruction of the village was gradual and complete. … This was Hawaiian Volcano Observatory’s first real experience with property destruction by a lava flow. (USGS)

October 30, 2025 by Peter T Young 1 Comment

Kaʻohe

Looking at land divisions on the Island of Hawaiʻi, “the common ahupuaʻa is found to be a strip say 1,000-feet average width, and running from the seashore, not by any means to the top of the mountains, but to the zone of timber land that is generally exists between 1,700 and 5,000-feet line of elevation. The ordinary ahupuaʻa extends from half a mile to a mile into this belt.”

“Then there are the large ahupuaʻa which are wider in the open country than the others, and on entering the woods expand laterally so as to cut off the smaller ones, and extend toward the mountain till they emerge into the open interior country not however to converge to a point at the tops of the respective mountains.”

“Only a rare few reach those elevations, sweeping past the upper ends of all the others, and by virtue of some privilege in bird-catching, or some analogous right, taking the whole mountain to themselves.”

“Thus Mauna Loa is shared by three great lands, Kapapala and Kahuku from Kaʻū, and Humuʻula from Hilo. Possibly Keauhou from Kona may yet be proved to have had a fourth share.”

“The whole main body of Mauna Kea belongs to one land from Hāmākua, viz., Kaʻohe, to whose owners belonged the sole privilege of capturing the ʻuaʻu, a mountain-inhabiting but sea-fishing bird.” (Kaʻohe translates to ‘bamboo;’ the name may relate to a bamboo water carrier.)

“High up on its eastern flank, however, stretched the already mentioned land of Humuʻula, whose upper limits coincide with those of the māmane, a valuable mountain acacia, and which, starting from the shore near Laupāhoehoe, extends across the upper ends of all other Hilo lands to the crater of Mokuʻāweoweo.”

“These same lands generally had the more extended sea privileges. While the smaller ahupuaʻa had to content themselves with the immediate shore fishery extending out not further than a man could touch bottom with his toes …”

“… the larger ones swept around outside of these, taking to themselves the main fisheries much in the same way as that in which the forests were appropriated.”

“Concerning the latter, it should here be remarked that it was by virtue of some valuable product of said forests that the extension of territory took place.”

“For instance, out of a dozen lands, only one possessed the right to kalai waʻa, hew out canoes from the koa forest. Another land embraced the wauke and olona grounds, the former for kapa, the latter for fish line.” (Lyons, The Islands, July 9, 1875)

“From the mass of evidence taken we find that in ancient time the main value of the land of Kaʻohe was the uwaʻo, a sea-bird, whose habitat was the dry, rocky and elevated portion of the mountain.” (Appeal from Boundary Commissioner, May 31, 1892)

Kaʻohe is an irregular ahupua‘a because it only occupies a narrow (and relatively resource-poor) band along the coast where most of the residents would have lived.

But as Kaʻohe ascends the eastern slope of Mauna Kea and emerges above the forest near 6,000-feet in elevation, it expands to occupy the entire summit region. The uplands of Kaʻohe would have contained few food resources beyond ground-nesting birds.

The primary evidence of pre-contact human utilization of Kaʻohe’s vast mountain region is the adze quarry, which would have provided Kaʻohe with a valuable resource to exchange with other ahupua‘a. (Mills)

The adze quarry area was “the largest workshops in the world for making of stone tools.” (Kenneth Emory) It covers an area of roughly 7 ½-square miles on the south slope of Mauna Kea. The main activity was concentrated in a zone that is 1-to-1½ miles wide between the 11,000 and 12,400 ft. elevation.

The landscape is dotted with numerous cinder cones, the principal one of which in the quarry area is Puʻu Koʻokoʻolau. The upper slopes of Mauna Kea have been described as a stony alpine desert. There is little vegetation and the ground surface has the appearance of a desert pavement.

Kaʻohe effectively crosses and includes all regions going from the sea to the summits of Mauna Kea and Mauna Loa. Some of the general regions include (from top to bottom:)

Kuahiwi – the mountain top, which is too high in elevation for heavy vegetation to grow. It has strong winds and extreme climates (sometimes very hot and sometimes very cold.)

Kualono – the region near the mountain top. Likewise, very few plants and animals live here. Māmane and naio (hardwoods) are the only hardy trees to grow at this height.

Waomaʻukele – the region named for the wet, soggy ground. The main trees that live in this area are the koa and ʻōhiʻa. This area was located in the rain belt of the island, especially on the koʻolau side of each island.

Waoakua – the forested region, the realm of the god and where the rain forest begins. This sacred area was kapu to most kānaka.

Waokānaka – where kānaka live and farm the land. Wood was harvested for tools, weapons and canoes; many other useful things for everyday living were gathered here.

Kula – the upland plain or open country. Pili was harvested and used mostly for thatching hale (houses).

Kahakai – the edge of the ocean. Here ʻākulikuli, with succulent green leaves, resists wind and salt water. Its leaves contain a special chemical that acts like a natural steroid.

July 22, 2025 by Peter T Young Leave a Comment

Mauna Loa (“long mountain”) is the world’s largest active volcano and probably the largest single mountain mass of any sort on earth. It rises 13,679-feet above sea level, and about 31,000-feet above its base at the ocean floor.

(Of course this relates to surface volcanoes – Tamu Massif, a rounded dome in the northwest Pacific, measures about 280 by 400 miles, or more than 100,000 square miles and lies about 6,500 feet below the ocean surface (Mauna Loa measures about 2,000 square miles.))

Mauna Loa’s volume is of the order of 10,000 cubic miles, as compared to 80 cubic miles for the big cone of Mount Shasta in California. This huge bulk has been built almost entirely by the accumulation of thousands of thin flows of lava, the individual flows averaging only about 10 feet in thickness. (NPS)

The enormous volcano covers half of the Island of Hawai`i and by itself amounts to about 85 percent of all the other Hawaiian Islands combined. (USGS)

Mauna Loa has grown rapidly during its relatively short (600,000 to 1,000,000-years) history. Detailed geologic research on the volcano has nevertheless shown that about 98-percent of the volcano’s surface is covered with lava flows less than 10,000 years old. (USGS)

Since 1832, Mauna Loa has erupted 39 times; its last eruption started in 1984. According to USGS estimates, the volcano has erupted an average of once every 6 years over the past 3000. (SOEST)

The Ahupua‘a of Kapapala encompasses both the summit area and eastern flanks of Mauna Loa; this relatively large ahupua‘a extends from the coastline (Nāpu‘uonā‘elemākule to Keauhou) to the summit of Mauna Loa and Moku‘āweoweo Caldera. (NPS)

The large size of the ahupua‘a may be accounted for because the area contains limited natural resources within its boundaries: coastal resources most likely provided residences with rich marine resources; upland areas were rich in forest resources (e.g. forest birds, canoe material). However, the remaining portions of the ahupua‘a include the vast Ka‘u desert. (NPS)

The first modern climb of Mauna Loa was made by Archibald Menzies, the acclaimed naturalist and botanist serving with Captain George Vancouver on the Discovery.

In February 1794, after receiving advice and assistance from King Kamehameha (guides, attendants and transportation to the southern point of the island,) Menzies and the team reached the summit (fueled by rations consisting of few ship’s biscuits, a bottle of rum, some chocolate and a few coconuts.) (NPS)

Later, between December 1840 and January 1841, the US Exploring Expedition, led by Lt. Charles Wilkes, was the first US exploring and surveying expedition to the South Seas.

“(I)t was my intention to proceed to Hawaiʻi, there to ascend to the top of Mauna Loa; to make the pendulum observations on the summit and at the base of that mountain; to examine the craters and late eruptions”. (Wilkes 1845)

The expedition team was supported by a throng of porters that stretched out across the landscape and Wilkes described the scene as consisting of “…200 bearers of burdens, forty hogs, a bullock and bullock hunter …”

“… fifty bearers of poe (native food), twenty-five with calabashes…lame horses, which, instead of carrying their riders, were led by them; besides a large number of hangers-on, in the shape of mothers, wives, and children, equaling in number the bearers, all grumbling and complaining of their loads…”(Wilkes, NPS)

Once at the summit, a camp (called Pendulum Peak) was set up with rock walls to buttress tents against the extreme weather conditions, and the expedition could carry out observations and mapping.

The expedition mapped the summit region and conducted scientific efforts in the relatively unknown alpine wilderness area. The culmination of the Expedition coincided with the establishment of the Smithsonian Institution and the Natural Museum of Natural History. (NPS)

Land Commission testimony (1845) notes that sandalwood was an important resource, “When the people used to go after sandalwood the Alii of Kapapala Naihe and Aikanaka took it for Kaaumanu.”

“The Kaalaala people went after sandalwood for their chief but the people of the other lands in Kau used to go after sandalwood on Kapapala and take to their chiefs. This was the last gathering of sandalwood for Kamehameha III to pay the debt.” (NPS)

After the Mahele of 1848, the lands of Kapapala were retained as crown lands under Kauikeaouli (Kamehameha III). Upon his death, the title to the land was transferred to his successor, Kamehameha IV, who ruled the islands from 1854-1863. The land remained as crown lands until the overthrow of the Hawaii Monarchy in 1893. (NPS)

Others later climbed the mountain: “Struggling, slipping, tumbling, jumping, ledge after ledge was surmounted, but still, upheaved against the glittering sky, rose new difficulties to be overcome. Immense bubbles have risen from the confused masses, and bursting, have yawned apart.…”

“Earthquakes have riven the mountain, splitting its sides and opening deep crevasses, which must be leapt or circumvented. … stepping over deep cracks, which, perhaps, led down to the burning, fathomless sea, traversing hilly lakes ruptured by earthquakes …”

“… and split in cooling into a thousand fissures, painfully toiling up the sides of the mounds of scoriae frothed with pumice-stone, and again for miles surmounting rolling surfaces of billowy, ropy lava – so passed the long day, under the tropic sun and the deep blue sky.” (Isabella Bird, 1875)

Starting in 1906, George Lycurgus (early operator of the Volcano House) and newspaperman Lorrin Andrews Thurston were working to have the Mauna Loa and Kilauea Volcanoes area made into a National Park. In 1912, geologist Thomas Augustus Jaggar arrived to investigate and joined their effort.

In September 1915, Jaggar, Thurston and a US Army representative conducted a survey to determine a route for a trail up Mauna Loa. The following month, a local paper noted, “Soldiers Building Mountain Trail. Negro soldiers of the Twenty-fifth Infantry to the number of 150 are at work constructing a trail from near the Volcano House to the summit of Mauna Loa.”

“It is estimated that three or four weeks will be devoted to this work. The soldiers are doing the work as a part of their vacation exercises.” (Maui News, October 29, 1915)

The Buffalo Soldiers built the 18-mile trail to the summit of Mauna Loa. They also built the ten-man Red Hill Cabin and a twelve-horse stable, so scientists could spend extended periods of time studying the volcano.

On August 1, 1916, President Woodrow Wilson signed the country’s 13th National Park into existence – Hawaiʻi National Park. At first, the park consisted of only the summits of Kīlauea and Mauna Loa on Hawaiʻi and Haleakalā on Maui. On, July 1, 1961, Hawaiʻi National Park’s units were separated and re-designated as Haleakalā National Park and Hawaiʻi Volcanoes National Park.

April 10, 2025 by Peter T Young Leave a Comment

Ohia Lodge

“For a number of years prior to the beginning of [WWII], home building was curtailed, and such materials as might normally be needed to meet the housing requirements of a growing population were diverted to national defense … these materials were actually frozen.” (DOI Annual Report, 1946)

Then, in post-WWII, “During the past year [1946] the problem has become even more serious. The Governor’s housing committee and a committee of the chamber of commerce of Honolulu, after a careful study, reported that 11,000 additional houses were needed”.

“A number of factors have militated against an adequate home-building program. The most important of these are: (a) scarcity of land even at an extremely high price, (b) unavailability of building materials, and (c) shortage and high cost of labor.” (DOI Annual Report, 1946)

“Two enterprising Honolulu business men, with faith in the future of Kona … have licked the building material shortage by using their brains and brawn. The are Howard O Redfearn, the former Honolulu contractor, and Chester Horn …”

“About the first of the year they started to work to create the timber and other material necessary for the construction of their Ohia Lodge, on Redfearn’s 350-acre tract in South Kona …”

“They were unable to procure material at that time, so set about making their own. First Redfearn moved his sawmill to the site and set it up. Then the two men went to work with ax and saw cutting down ohia trees, which grow in abundance on the tract. They selected uniform size and then trimmed off the bark and sawed the log in half.”

“With these halves, placed upright, they began the construction of the first lodge, which is 24 by 50 feet. … The interior of the building, including the bar, the tables, doors, bar stools and kitchen are built of koa and ohia.”

“The koa was obtained from a nearby forest but the ohia wood all came from the Redfearn ranch. … The floor is cement but is waxed for dancing. The foundation and all the masonry has been constructed from rocks gathered up on the place, as well as a great circular water tank, cemented inside …”

“A large parking space has been levelled off in front of the building and this will be paved. Around it there will be special landscaping and flower gardens.”

“The lodge bar will be opened for business [on May 29, 1947]. A little later the dining room, which will specialize in charcoal cooked steaks and short orders, will be opened. And as soon as possible a general liquor dispensary will be opened.” (Hilo Tribune Herald May 10, 1947)

“Plans have been prepared for the construction of 40 cottages in the rear of the lodge similar to many types seen on the mainland. These cottages will be 12×16 feet, and each will contain two three-quarter size beds, adequately spaced for privacy.”

“After the cottages have been constructed a modern gas station will be built, carrying all kinds of motor supplies. The whole setup will stimulate a miniature California Palm Springs, with mild desert air included.”

“Horn will be general manager. Orchestra music will be supplied every Saturday night and on any other occasion required.”

“As a special added attraction for tourists there will be saddle trails all over the tract so that guests will be able to go horseback riding at all times and since the tract is but a short distance from the sea arrangements to conduct fishing parties will be an added feature in the line of sports.” (Hilo Tribune Herald May 10, 1947)

‘Ōhia Lodge, the half-way house on the main highway between Hilo and Kona was “a showplace. Howard Redfearn built it as a volcano country club resort and opened it in [1947]. The lodge, built of Ohia, a native hardwood similar to mahogany, had a dining room seating 200 people.” (Spokesman-Review, Jun 6, 1950)

“[P]eople came from far and near to see for themselves what two men, alone and unaided, had accomplished in such a short time. … [I]t is so located that it gives a clear view of both the mountains and the sea, and is on the main highway into the Kona district.” (Hnl Adv, Aug 3, 1947)

“Mr Redfearn also revealed that he has begun the construction of another dwelling, to be occupied by Mr and Mrs William [and Helene] Hale, teachers at Konawaena school, and four tourist cabins …”

“… the first units of several to eventually be built for the convenience of tourists and others. Two dwellings have already been completed and occupied and a third is now under construction.” (Hilo Tribune Herald, Feb 24, 1949)

“The first three units of the proposed auto court at Ohia Lodge Kona is partially completed by Howard O Redfearn, proprietor of the lodge.”

“Work, however, has been temporarily suspended while Redfearn is engaged in the construction of a new … residence for Richard Penhallow at Waimea … This will be the fourth residence of the completed by Mr Redfearn of this unique design.” (Hilo Tribune Herald, Oct 1, 1949)

Then, disaster struck; Mauna Loa erupted … “Howard Redfearn’s handsome Ohia Lodge in South Kona was engulfed by lava between 8 and 9 last night. A fiery finger, separating from the main channel, moved steadily toward the lodge during the afternoon and finally reached the building, wiping out the Ohia and field stone structures.”

“It was the plan to expand Ohia lodge facilities with a group of tourist cabins. It is reported that two such cabins had been constructed before the lodge was destroyed by the flowing lava.” (Star Bulletin, Jun 5, 1950)

April 8, 2025 by Peter T Young Leave a Comment

Six Active Volcanoes in Hawai‘i

The Hawaiian Islands are at the southeast end of a chain of volcanoes that began to form more than 70 million years ago. Each island is made of one or more volcanoes, which first erupted on the floor of the Pacific Ocean and emerged above sea level only after countless eruptions.

Hawaiʻi sits over a ‘hot spot,’ the Hawaiian hot spot.

It’s one hot spot, but lots of volcanoes have formed over it. The Islands are above a moving sea floor of the North Pacific Ocean (the Pacific Ocean is mostly floored by a single tectonic plate known as the “Pacific Plate.”)

The Pacific Plate is moving over the layer in the Earth known as the Asthenosphere. This movement takes it to the northwest. As the plate moves over a fixed spot deeper in the Earth where magma (molten lava) forms, a new volcano can punch through this plate and create an island.

As the plate moves away, the volcano stops erupting and a new one is formed in its place. With time, the volcanoes keep drifting westward and getting older relative to the one active volcano that is over the hot spot.

As they age, the crust that they sit on cools and subsides. This, combined with erosion of the islands, once active volcanism stops, leads to a shrinking of the islands with age and their eventual submergence below the ocean surface.

Each island is made up of at least one primary volcano, although many islands are composites of more than one. The Big Island, for instance, is constructed of 5 major volcanoes: Kilauea, Mauna Loa, Mauna Kea, Hualālai and Kohala (the island is still growing, but is basically about 400,000-years old.)

About 40-million years ago, the Pacific Plate changed direction from north to northwest – so the Emperor Seamounts run more north-south, the Hawaiian Ridge north-westerly.

Midway Island is 27.7-million years old; Meiji Seamount the northern part of the Emperor Seamount (near the end of the Aleutian chain) is about 80-million years old.

All of these are still youngsters, when you look at the perspective, say, of the dinosaurs. The Islands weren’t even a glimmer in anyone’s eyes when dinosaurs walked the Earth; sixty-five million years ago the last of the non-avian dinosaurs went extinct, after living on Earth for about 165-million years. (USGS)

If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (1 calendar year), the dinosaurs appeared January 1 and became extinct the third week of September.

Using this same time scale, the Earth would have formed approximately 18.5-years earlier. By comparison, people have been on earth only since December 31 (New Year’s eve.) (USGS)

While we typically think of and/or hear news reports of eruptions on Kilauea and Maunaloa, presently, the US Geological Survey (USGS) Hawaiian Volcano Observatory (HVO) monitors the six currently active volcanoes in Hawai‘i.

The Island of Hawai‘i, with four active volcanoes, is liveliest. Between 1912 and 2012, there were nearly 50 Kīlauea eruptions, 12 Mauna Loa eruptions, and one Hualālai intrusion of magma.

Kīlauea, the youngest and most active volcano on the Island of Hawai‘i, erupted almost continuously from 1983 to 2018 at Pu‘u‘ō‘ō and other vents along the volcano’s East Rift Zone. Since then, there have been periodic eruptions in and nearby Halema‘uma‘u crater at the volcano’s summit.

In 2018, Kīlauea experienced the largest lower East Rift Zone eruption and summit collapse in at least 200 years. Several summit eruptions since December 2020 have generated lava lakes that have been slowly filling in the collapsed area, including Halema‘uma‘u crater. About 90 percent of the volcano is covered with lava flows less than 1,100 years in age.

Mauna Loa, the largest volcano on Earth, has erupted 34 times since 1843. An eruption 1984 lasted 22 days and produced lava flows which reached to within about 4.5 miles of Hilo, the largest population center on the Island of Hawai‘i.

The most recent eruption in 2022 lasted two weeks and erupted lava flows that came to within 1.7 miles of the Daniel K Inouye Highway (Saddle Road). Lava flows less than 4,000 years old cover about 90 percent of the volcano.

Hualālai, the third most active volcano on the Island of Hawai‘i, has erupted three times in the past 1,000 years and eight times in the past 1,500 years.

The most recent eruption in 1801 generated a lava flow that reached the ocean and now underlies the Kona International Airport. Lava flows less than 5,000 years old cover about 80 percent of the volcano.

Mauna Kea, the highest volcano on the Island of Hawai‘i, erupted most recently between about 6,000 and 4,500 years ago from at least seven separate summit-area vents, producing lava flows and cinder cones. Glaciers covered parts of the volcano’s summit area during the recent ice ages, the only Hawaiian volcano known to have been glaciated.

Kama‘ehuakanaloa (formerly Lō‘ihi Seamount), the only known active Hawaiian submarine volcano, erupted most recently in 1996 during an earthquake swarm of more than 4,000 events that were recorded by the HVO seismic network. The volcano’s summit is about 3,179 ft below sea level, located 22 miles southeast of the Island of Hawai‘i.

Haleakalā, the only active volcano on the Island of Maui, erupted most recently between about 600 and 400 years ago. In the past 1,000 years, at least 10 eruptions produced lava flows and tephra cones from the rift zone that crosses the volcano from southwest to east and through Haleakalā Crater. (All here is from the US Geological Survey (USGS.))