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April 27, 2017 — Kīlauea

Delta at the Kamokuna ocean entry slowly growing

The episode 61g Kamokuna ocean entry has been slowly building a new lava delta for a little over a month now. Since our April 15 post, the delta has grown substantially. Two large cracks parallel to the coast are visible on the delta (center), with the distal portion slumping slightly seaward—suggesting further instability. Today, the ocean entry activity, most of which was located along the western side of the delta and obscured by the thick plume, was producing occasional weak littoral explosions.

Kīlauea summit lava lake level falls with return to deflation

Left: Early this morning the lava lake level was measured at 12.5 m (41 ft) below the vent rim, the highest level the lake reached this month. But, at around 8:30 a.m., summit inflation switched to deflation and the lava lake level began to drop. Right: By mid-afternoon, when these photos were taken, the drop in the lava lake level was obvious. A "bathtub ring" of black lava forming a rim on the vent wall (between the lighter-colored rocks higher in the wall and the surface of the lava lake) provides a record of the lake's previous higher level.

April 15, 2017 — Kīlauea

Small delta at the ocean entry

The ocean entry at Kamokuna remains active, with a small lava delta. Views of the lava streams entering the water were obscured by the thick plume. Very weak littoral explosions were occurring.

April 10, 2017 — Kīlauea

Episode 61g Kamokuna ocean entry remains active

A small delta at the Kamokuna ocean entry (left) continues to slowly build. Our observations this afternoon (April 10) indicate that the coastal plain breakouts that had been active since mid-February have died within the last few days. Currently, the only active surface flows are from the March 5 breakout on the upper flow field. This activity has not significantly advanced, and remains within roughly 3.5 km (2.2 mi) of the episode 61g vent. The National Park Service viewing area and rope line are visible in the center of the photo.

This video clip shows the Kamokuna ocean entry, with the laze plume blocking the view of the delta. The billowing white cloud rising from the ocean entry is a corrosive seawater plume laden with hydrochloric acid and fine volcanic particles that can irritate the skin, eyes, and lungs.

April 8, 2017 — Kīlauea

Small delta has formed at ocean entry; evidence of recent delta collapses

A small delta has formed at the Kamokuna ocean entry, but views of the delta have been largely obscured by the thick ocean entry plume.

Left: A closer view of the delta. A small black sand beach is visible on its eastern side (bottom of photo). Right: Fragments of floating lava drift away from the ocean entry, creating small steam plumes as the hot lava boils the seawater.

A field of blocks on the sea cliff above the ocean entry suggest that lava delta collapses and explosions have recently occurred. The blocks are resting on a thick layer of Pele's hair and limu o Pele, which are small glassy particles that fall from the ocean entry plume.

HVO geologists encountered only one tiny breakout on the coastal plain on Saturday. The pali can be seen in the background.

March 30, 2017 — Kīlauea

Small delta at Kamokuna ocean entry

The episode 61g flow continues to enter the ocean at the Kamokuna ocean entry (center), and was producing a robust plume. The western Kamokuna delta, which was abandoned in late September 2016, is visible to the left of the entry. A few weak surface breakouts were still active on the coastal plain, but most surface activity is within approximately 3.5 km (2.2 miles) of the vent. The episode 61g tube is marked by fume traces that can be seen along the flow field, and Puʻu ʻŌʻō is visible in the center of the skyline.

A close-up view of the Kamokuna ocean entry. A tiny delta has been building, but is not clearly visible through the thick plume. One spot of incandescence can be seen through a break in the plume (center) just above sea level. Floating, steaming blocks were also seen in the water just off the ocean entry (lower middle-right).

March 20, 2017 — Kīlauea

A 3D tour of Kīlauea's summit lava lake

This 3D model of the lava lake at Kīlauea's summit was constructed from a series of thermal images acquired during an overflight on Thursday, March 16. For scale, the lava lake is about 250 meters (820 ft) across. The lake is within the Overlook crater, which is within Halemaʻumaʻu Crater.

The model shows that a portion of the Overlook crater wall, along the southern wall of Halemaʻumaʻu Crater, is overhanging. If this portion of the crater wall collapses it could trigger a small explosive event, similar to those which occurred in November and December of 2016.

March 16, 2017 — Kīlauea

Lava stream at ocean entry continues

A firehose of lava continues to pour into the sea at the Kamokuna ocean entry, sending a plume of steam, hydrochloric acid, and glass particles into the air and drifting downwind. Offshore, lava entering the sea also produces plumes of hot, discolored water. The circular area of dark water in front of the entry is a region of cooler water between the split plumes of hotter water.

Left: A closer view of the ocean entry and plumes of hot, discolored water. Right: A thermal image shows the two plumes of hot water extending out from the ocean entry point. A circular area of cool water is directly in front of the entry point, between the two plumes. Several boats leave tracks of stirred-up cooler water cutting through the hot water on the surface.

A closer view of the lava firehose at the ocean entry. The lava stream here is roughly 1-2 meters wide (3-6 ft), and plunges about 20 m (66 ft) into the water.

Left: Puʻu ʻŌʻō started as a cinder and spatter cone in the 1980s, but over the past 30 years flank vents on the cone have produced stacks of lava flows, creating a broad shield around the cone. This view looks north and shows the shield shape clearly. Mauna Kea Volcano can be seen in the distance. Right: A lava pond has been present in a small pit in the western portion of Puʻu ʻŌʻō Crater for nearly two years. Unusually clear views today revealed several areas of spattering, and some crustal foundering.

Lava lake in Halemaʻumaʻu Crater rising over past day

Summit inflation over the past day has driven the lava lake to rise slightly. This morning, the surface of the lake was about 23.5 m (77 ft) below the Overlook crater rim. In this photo, spattering was occurring along the southern lake margin in two locations.

March 2, 2017 — Kīlauea

Sluggish breakout on Kīlauea Volcano's coastal plain remains active

The surface breakout that started on February 10 remains active on the coastal plain just east of the main episode 61g lava flow field. The flow front, pictured here, advanced to about 300 m (0.2 miles) from the emergency access road in Hawaiʻi Volcanoes National Park, but appeared to be stalled this afternoon. However, there is still active pāhoehoe visible on the coastal plain, with the closest breakouts observed at about 500 m (0.3 miles) from the road.

February 22, 2017 — Kīlauea

61g coastal lava flow remains active

Today (February 22, 2017), the breakout along the eastern edge of Kīlauea Volcano's episode 61g flow remains active and had advanced approximately 570 m (620 yards) since it was last mapped on February 14. The flow front consisted of sluggish, oozing pāhoehoe that was approximately 730 m (0.5 miles) from the ocean and 540 m (0.3 miles) from the emergency route road. Channelized lava flows have been recently reported on Pūlama pali, but no active channels were seen by HVO geologists while working in the area this afternoon. They did, however, observe scattered breakouts on the pali.

February 14, 2017 — Kīlauea

A Valentine's Day view of Kīlauea Volcano's summit lava lake

Today, Kīlauea Volcano's summit lava lake level was 21 m (69 ft) below the vent rim. A long stretch of active spattering was visible along the east lake margin from the rim of Halemaʻumaʻu Crater, an area that remains closed to the public due to ongoing hazards. The usual spatter source to the southeast was small by comparison. In the afternoon light, the dark lava flows on either side of the vent rim were quite visible. These flows spilled onto the floor of Halemaʻumaʻu Crater in April-May 2015, and again in October 2016, when the lava lake level briefly rose above the vent rim several times.

A telephoto view of the east lake margin showed that the spattering was focused in small embayments created by promontories of cooled, congealed lava jutting from the vent wall.

At times, spattering along the east lake margin reached heights of 6–9 m (20–30 ft), as shown in this telephoto image.

61g flow coastal breakout still active

The 61g flow breakout that started on February 10 on Pulama Pali was still active today. The flow front (shown here) is approximately 2.3 km (1.4 mi) from the base of the pali and 1.2 km (0.75 mi) from the ocean. The flow front is on the eastern side of the 61g flow field, and is outside the National Park boundary.

February 12, 2017 — Kīlauea

High-tech instruments track volcanic gases at Kīlauea Volcano

Left: An FTIR instrument is set up on the rim of Halemaʻumaʻu Crater to measure volcanic gases from the summit lava lake. The open-path Fourier transform infrared (FTIR) spectrometer continuously measures the gases in a volcanic plume, measuring the relative abundance of each. Most of the gas emitted during a volcanic eruption is water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide(SO2).
Right: HVO's geochemist uses a Fourier Transform Infrared Spectrometer (FTIR) instrument to track volcanic gases emitted from the lava lake with Halemaʻumaʻu Crater. These measurements help detect changes in gas composition, which can provide insight into the inner workings of Kīlauea Volcano.

View of the lava lake within Halemaʻumaʻu Crater from the FTIR spectrometer monitoring location. At Hawaiian volcanoes, magma ascends from the mantle more than 60 km (about 40 mi) below the surface, to a reservoir less than 2 km (about 1.2 mi) deep. As the pressure decreases, the gases dissolved in the magma bubble out and escape. Magma continues to rise through a shallow conduit to the Halemaʻumaʻu lava lake, where it continues to degas (the blue haze is indicative of sulfur gases).

February 8, 2017 — Kīlauea

"Firehose flow" visible from public lava viewing area

Left: The "firehose flow" at Kīlauea Volcano's Kamokuna ocean entry was clearly visible from the public lava viewing area established by Hawaiʻi Volcanoes National Park. The viewing area is 800 meters (about one-half mile) from the ocean entry, but affords excellent views of the lava flow. Right: A telephoto lens captures a closer view of the Kamokuna "firehose flow."

VIDEO: Kīlauea Volcano's Kamokuna ocean entry. Today, the "firehose flow" could be clearly seen from the public lava viewing area, 800 meters (about one-half mile) east of the ocean entry, in Hawaiʻi Volcanoes National Park.

Left: Explosive interactions between the lava and ocean can throw spatter high onto the cliff around the ocean entry. Spatter in photo is visible scattered across the sea cliff with a glove for scale. Right: Close up view of the Pele's hair and Limu o Pele that blankets the sea cliff around the Kamokuna ocean entry. The coverage is especially thick in the areas downwind of the ocean entry which may make it difficult to see all areas of extended cracks.

Left: Photo looking toward the public viewing area (arrow) from near the ocean entry. Right: Photo of the upper portion of the "firehose" taken with a telephoto lens as the lava exits the 61g flow lava tube. There is no sign of a lava delta rebuilding as the lava continues to spill into the ocean.

February 2, 2017 — Kīlauea

Sea cliff at Kamokuna ocean entry collapses

HVO geologists hiked to the Kamokuna ocean entry today to assess the status of the sea cliff. When they arrived, the "firehose" flow was no longer visible. However, spatter (bits of molten lava) and black sand flying through the steam plume indicated that lava was still flowing into the ocean and interacting explosively with seawater. Just below the left side of the steam cloud, a small shelf of the Kamokuna lava delta that survived the New Year's Eve collapse can be seen.

Within minutes of HVO geologists reaching the ocean entry site, the sea cliff seaward of the hot crack (see Jan. 30 images) collapsed with no warning; fortunately, they were far enough away to not be in harm's way. The top photo was snapped just before the collapse occurred. The bottom image shows the remaining sea cliff after the collapse. Yellow arrows point to the same rocks in both photos for comparison.

VIDEO: The section of sea cliff above the ocean entry collapsed today at about 12:55 p.m. The sea cliff had become increasingly unstable as a large crack 5–10 m (16–33 ft) inland of the ocean entry had more than doubled in width, from 30 cm (1 ft) to 70 cm (2.5 ft), over the past several days. A video camera, which had just been set up to monitor movement of the crack near the sea cliff, captured the moment of collapse.

The entire section of the sea cliff that was seaward of the hot crack collapsed, except for a small block of rock (left) at the eastern end of the crack; this piece of the sea cliff, estimated to be 30 m long and 5 m wide (98 x 16 ft), remains highly unstable and could collapse with no warning. During the collapse, rocks hitting the ocean generated a wave that propagated outward from the coast. After the collapse, no lava was visible, but is apparently still flowing into the sea based on the continuing steam plume and explosions of spatter.

February 1, 2017 — Kīlauea

Crack above Kīlauea's ocean entry has widened, increasing instability of sea cliff

The hot crack near the sea cliff, in the immediate area of the ocean entry, has widened significantly over the past four days. On Saturday, January 28, the crack was 30 cm wide (1 foot). Today, HVO geologists in protective gear briefly entered the area and measured the crack as being 75 cm (2.5 feet). In this image comparison, the yellow stars show corresponding points in the two images. The arrow also shows how much the crack has widened.

Remarkably, grinding noises could be heard coming from the crack, and the block of sea cliff on the makai (ocean) side of the crack could be seen to move slightly. These signs indicate that the section of sea cliff around the ocean entry is highly unstable and could collapse at any time.

From the lava viewing area established by Hawaiʻi Volcanoes National Park, you can witness Kīlauea Volcano's ocean entry from a safe distance. With binoculars or a telephoto camera lens, spectacular views and photos are possible (as seen here)—without risking your life by entering the closed area. As lava streams into the ocean, explosive interactions between the molten lava and cool seawater hurl spatter and rock fragments skyward, often as high as the sea cliff, which is about 28 m (92 ft) high.

Left: Using a telephoto lens, spatter and glassy rock fragments (black sand) from the explosive interaction of molten lava and seawater can be seen flying skyward and seaward. At times, these fragments were thrown high enough to land on the sea cliff above the ocean entry—one of many hazards impacting this area. Right: Detailed views of the "firehose" flow streaming from the lava tube, spatter, and rock fragments were provided by zooming the telephoto lens in even closer.

This image comparison shows the changing nature of the lava stream between Saturday, January 28 and Wednesday, February 1. The lava stream has become much more narrow, as viewed from this angle.

January 30, 2017 — Kīlauea

Ground crack at Kīlauea ocean entry is cause for concern

Due to the instability of the sea cliff above the ocean entry and other hazards created by molten lava flowing into the sea, Hawaiʻi Volcanoes National Park has established a viewing area (noted by yellow arrow in photo) from which the ocean entry can be seen in relative safety.

Left: A thermal image taken during HVO's overflight of Kīlauea Volcano's ocean entry on Jan. 25, 2017, revealed a hot ground crack in the sea cliff just above where lava is flowing into the sea. Because the crack suggested an unstable sea cliff, HVO geologists briefly visited the site on foot for closer observations and measurements this past weekend.

Right: Carefully approaching the site in protective gear on Jan. 28, HVO geologists determined that the eastern end of the hot crack was about 30 cm (11.8 in) wide and deeply cut into recent lava atop the older sea cliff. The western end could not be accessed due to poor air quality, spatter fallout, and other safety concerns. This crack could be a precursor to collapse of an unstable section of the sea cliff, making the site extremely dangerous for anyone who ventures too closely to the ocean entry by land or by sea.

Using a thermal image of the crack above Kīlauea volcano's ocean entry (steam from lava flowing into the sea is visible at the top of the left photo), HVO geologists determined that the temperature within the eastern end of the crack is up to about 220 degrees Celsius (428 degrees Fahrenheit).

At Kīlauea's ocean entry on Jan. 28 and 29, the interaction of molten lava flowing into cool seawater caused pulsating littoral explosions that threw spatter (fragments of molten lava) high into the air. Some of these incandescent clasts fell on top of the sea cliff behind the ocean entry, forming a small spatter cone. During one exceptionally large burst, spatter was thrown about twice the height of the sea cliff. These ocean entry littoral explosions, both large and small, create hazardous conditions on land and at sea.

January 29, 2017 — Kīlauea

Evening views of the ocean entry

The lava stream, pouring out of the lava tube on the sea cliff at the Kamokuna ocean entry, continues and was similar to yesterday. The stream appeared wider (as viewed from this angle) today compared to yesterday, and often had holes in the thin sheet. The entry was still producing small, pulsating littoral explosions.

A wider view of the ocean entry, at sunset.

This video clip shows the open lava stream pouring into the ocean. Frequent littoral explosions throw bits of lava to heights of over 27 m (30 yards).

January 28, 2017 — Kīlauea

Open lava stream continues at ocean entry

An open lava stream continues to pour out of the lava tube, perched high on the sea cliff, and into the ocean. The stream was remarkably steady today, but produced pulsating littoral explosions that threw spatter onto the sea cliff.

Left: A wider view of the ocean entry. Right: Near the base of the lava stream, just above where it impacted the water, there were commonly ripples in the stream, suggesting this was a narrow sheet of lava. These ripples can be seen on the lower right side of the lava stream. A few small, steaming clasts thrown up by a small littoral explosion are visible in front of the stream.

A close up of the stream near the spot where it exits the tube. This view was only possible with a very high magnification lens.

This video shows a wider view of the open lava stream at the ocean entry, and the frequent littoral explosions.

This video shows a close-up of the base of the lava stream, where ripples in the narrow sheet of lava are visible.

January 25, 2017 — Kīlauea

Lava continues to stream out of tube at Kamokuna ocean entry

A steady stream of lava exiting the episode 61g lava tube pours into the ocean at the Kamokuna ocean entry. The interaction between the lava and ocean water causes explosive reactions, throwing bits of lava (seen in the photo at the base of the lava stream).

Left: Since the delta collapse on December 31, 2016 there has not been any evidence of the lava delta rebuilding. The fume trace of the 61g tube system on the coastal plain is visible up slope from the ocean entry. The cove in the sea cliff (at center) is where the ~4 acre portion of old sea cliff collapsed into the ocean after the delta fell in. The new public lava viewing area and rope line is in the lower right, and the emergency access road is just inland from the coast. Right: Misty weather created a double rainbow over Pūlama Pali and the 61g flow field. Fume trace from the tube can be seen at bottom center.

A close up of the lava stream pouring out of the tube and directly into the Pacific Ocean.

This video clip shows the lava stream - about 1-2 m or yards wide - pouring out of the tube into the Pacific Ocean, triggering pulsating explosions that are throwing bits of lava onto the top of the sea cliff.

This thermal image shows the Kamokuna ocean entry. Two plumes of hot (scalding) water branch out from the entry point. The lava stream itself is the very hot feature right of center. Just above the lava stream, about 10 meters (yards) behind the sea cliff, is a narrow line of high temperatures that appears to be a hot crack. This hot crack suggests that the sea cliff around the entry point is unstable and has the potential to collapse.

January 24, 2017 — Kīlauea

The ups and downs of Kīlauea Volcano's summit lava lake

Kīlauea Volcano's summit lava lake level typically rises and falls in concert with summit inflation and deflation, as shown by these two HVO webcam images. The left image was captured a week ago (on Jan. 17, 2017), when the lava level was 52.5 m (172 ft) below the vent rim, the lowest level measured since April 8, 2016. The right image, captured this morning (Jan. 24, 2017), shows the lava lake level at 15 m (49 ft) below the vent rim. Unfortunately, gases emitted from the lava lake and poor weather conditions partially obscure the images.

January 19, 2017 — Kīlauea

Rising summit lava lake level improves views of spattering

Kīlauea Volcano's summit lava lake level rose over the past day with steep summit inflation, providing improved views of spattering from visitor overlooks in Hawaiʻi Volcanoes National Park. This photo was taken from the rim of Halemaʻumaʻu Crater, an area that is closed to the public due to ongoing volcanic hazards, and shows spattering in the southeast corner of the lava lake. The main portion of spattering was about 10 meters (yards) high, but small bits of spatter were thrown over 20 meters (yards) high. On Friday morning (Jan. 20), small bits of spatter from the lava lake surface were visible from the Park's Jaggar Museum overlook.

This video clip of Kīlauea Volcano's summit lava lake shows spattering along the southeast margin of the lake.

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