Kilauea Iki | Images of Old Hawaiʻi

Volcanologists knew something was coming.

Between November 1957 and February 1959 measurements from newly installed sensitive tiltmeter bases around the summit indicated that the whole caldera region was tilting outward, apparently because magma was welling up from the mantle and accumulating in the reservoir several miles beneath the caldera.

Between August 14 and 19, 1959, a swarm of deep earthquakes was recorded on the seismographs at the Hawaiian Volcano Observatory. The earthquakes were located about 35-miles below the volcano.

By October, tilt surveys of the caldera, using the new water-tube tiltmeter network, indicated that the summit reservoir of Kīlauea was beginning to inflate with new magma. Scientists later concluded that magma began its upward journey during the August swarm.

Another series of earthquakes – shallow tiny events beneath the caldera – began in mid-September near Halema‘uma‘u Crater. By November 1, more than 1,000 tiny earthquakes were being recorded per day.

Scientists conducted another caldera tilt survey during the second week of November and discovered it was swelling at least three times faster than during the previous months. Magma was moving into the summit reservoir at a high rate.

During the afternoon of November 14, earthquakes beneath the caldera suddenly increased about tenfold in both number and intensity. For five hours, the entire Kīlauea summit region shook as seismic tremor signaled magma was forcing its way from the summit reservoir toward the surface.

An erupting fissure of small lava fountains broke through the south wall of Kīlauea Iki Crater at 8:08 p.m. In the first 24 hours, activity decreased and then eventually ceased at the outermost fissure vents. By nightfall on November 15, only a single vent on the west side of the fissure remained active.

Over the next five days, lava fountain heights fluctuated between about 650 and 980-feet, with a maximum fountain height of 1,247-feet.

A brand new cinder cone called Puʻupuaʻi (translates to “gushing hill”) was formed. As cinder and spatter rapidly accumulated to form Puʻupua‘i, slabs of congealed spatter occasionally broke loose and slid down the cone into the churning lava lake.

The 1959 summit eruption occurred in Kilauea Iki, a collapse crater adjacent to the main summit caldera of Kilauea. There were 17 eruptive ‘episodes’ (or phase) of the eruption which ranged in duration from 1 week to 1¾-hours..

On December 17, episode 15 produced lava fountains that were approximately 1,900-feet high, the highest recorded in Hawaii during the 20th century.

That’s about three times the size of the Washington Monument. That’s also 124 feet higher than the tallest building in the US now: One World Trade Center. (CNN)

Downwind from high lava fountains, forests suffered tremendous damage. Trees were stripped of leaves and branches – or completely buried – by falling cinder. You can now walk through this area of the National Park; it’s called ‘Devastation Trail.’

A few ōhi‘a trees, dead and bleached, poke up through the pumice and very gradually some ōhi‘a, ōhelo and ferns are beginning to recolonize the dead zone (unfortunately, some blackberry, too.)

Here is a video of the eruption (unfortunately, there is no sound, the sound of an eruption is as impressive as the visual):

The lava lake attained its greatest depth (414 feet) and volume (58 million cubic yards) at the end of the eighth phase on December 11, 1959. The eruption ended December 20, 1959.

When we were kids, living on Kāne‘ohe Bay on O‘ahu, whenever the eruption happened we’d go to the Big Island to see it, including the 1959 eruption of Kīlauea Iki.

The eruption in Kilauea Iki had ended on December 21, but the shallow reservoir beneath the summit of Kilauea volcano was gorged with magma. Rather than removing pressure, the eruption had, for all intents and purposes, created more.

The end of 1959 was an uneasy time for the staff at the Hawaiian Volcano Observatory. During the last week of the year, a swarm of earthquakes started in Pāhoa (more than 1,000 earthquakes were recorded by the Pāhoa station on January 12.)

The 1960 Kapoho eruption and its predecessor, the 1959 summit eruption in Kilauea Iki Crater, together formed a summit-flank sequence. The Kapoho eruption caused havoc in lower Puna, an idyllic rural community until the lava fountains and flows covered farm land and villages.

The size and frequency of the earthquakes increased; at 8 am, January 13, the ground was severely cracked along the fault through Kapoho town. Movement along the fault was literally pulling the town apart.

The ground was constantly shaking. The roughly 300-residents undertook voluntary evacuation, which was completed by early evening. At 7:35 pm, January 13, 1960, a red glow above Kapoho confirmed the start of the eruption.

Within half an hour, fountaining was nearly continuous along a nearly ½ – mile long fissure. After a couple hours, the activity focused with central fountains – for the next 11-hours powerful steam blasts roared from the vents.

The resulting fallout coated everything with a thin film of fine, wet, glassy ash. Salt crystals formed as the water evaporated; they testified to the brackish nature of the groundwater.

By noon on January 14, the steam blasts had ended and lava fountaining was confined to many sources along a 650-foot long section of the fissure. An ʻaʻa flow, 18-feet thick and nearly 1,000-feet wide reached the ocean – a bench formed 300-feet beyond the old shoreline.

In an attempt to save Warm Springs, bulldozers pushed a rock dike; shortly after, lava overtopped it and filled the pool.

Kapoho, a bit uphill of the fissure, was near all this activity but had not been touched by lava. Pumice and lava were wreaking havoc on nearby homes and farms (papaya, coconut, orchid and coffee groves.)

ʻAʻa continued to enter the ocean; it was also spreading southward. Bulldozers worked in forming a barrier to protect Kapoho, Kapoho School, an area of expensive homes and real estate at Kapoho Beach Lots. By January 20, lava had reached the barrier and overtopped it on January 23; a second barrier was shoved aside on January 27.

A third barrier held the flow, but lava then moved underground, beneath the end of the barrier, emerging near Kapoho School. The buildings began to burn at 10 am and the school was lost shortly after noon.

The barrier itself remained intact, and it survived until February 5, when it was finally overtopped and almost totally buried by lava that eventually covered the Kapoho cemetery. More coastal houses were lost.

Despite notable developments in the vent area, Kapoho village remained virtually intact except for a blanket of pumice and ash that covered everything.

For seven hours on the afternoon of January 27, the heaviest pumice fall of the entire eruption rained down on the area during strong kona winds.

However, it was the lava flow that would doom the town.

Late that night, the rapidly moving ʻaʻa flow moved through the streets, overwhelmed building after building. By midnight January 27, most of Kapoho had been destroyed; a couple days later (January 30) the town was gone.

The eruption ended slowly. Dribbles of lava continued to enter the sea north of Cape Kumukahi as late as February 13. High fountains continued until February 15, when lava was spraying upward from the main vent area to heights of 600-feet. It gradually subsided and on the morning of February 19, the eruption stopped.

Volcanologists concluded that the Kapoho eruption was tied to events at Kilauea’s distant summit. On January 17, four days after the Kapoho eruption had started, the summit began to subside (deflate, by analogy with a balloon) as magma was leaving the storage reservoir and heading down the east rift zone to the Kapoho area.

The eruption was the first during the modern era of volcano monitoring at Hawaiʻi Volcanoes Observatory. As a result, probably more fundamental ideas were reached from it than from any other single eruption in Hawaiʻi.

The main lesson, and really the only one that bears repeating over and over again, is clear. What happened then will happen again. That lesson should never be lost. (All information here is from USGS.)

Kilauea Iki Eruption – 1959

1960 Kapoho Eruption