Images

Mount Hood photographed near Parkdale, Oregon.

Crustal foundering, in which pieces of the thin, flexible lake crust sink beneath the surface, is common in the southern portion of the lake.

This video clip shows spattering along the south margin of the summit lava lake. Note the large slab of crust migrating into the spatter site, where it is consumed. Unfortunately, wind noise masks much of the spattering sound in this video.

The June 26 breakout continues to advance across the coastal plain. Today, July 21, the front of this breakout was approximately 350 m (0.2 miles) wide, and roughly 2 km (1.2 miles) from the closest points in the emergency access road.

A beautiful sunset over Mauna Loa (in distance at left) provided a backdrop to the lava lake within Halema‘uma‘u. HVO and Jaggar Museum are on the horizon near the center of the panorama.

Clear weather provided good views of the lava lake at Kīlauea Volcano's summit. The activity this evening was typical for the lava lake, with variable spattering along the lake margins. Spattering shown here was in the southeast part of the lake, which is the most common site for spattering.

At about 7:00 p.m., the spattering was intense along the south margin of the lava lake.

About ten minutes after the photo at left, the spattering diminished and retreated to a small site within a small grotto.

The Kamokuna ocean entry and lava delta remain active, with no obvious changes over the past week. The large coast-parallel crack that spans the width of the delta (seen from lower-left to upper-right of image) remains prominent, and highlights the instability of the delta.

Kīlauea Volcano's Kamokuna ocean entry photographed on May 23, 2017 (left) and July 13, 2017 (right) show how lava flowing from the tube has both widened and thickened the delta. Near the sea cliff, the delta appears to have doubled in thickness over the past seven weeks, creating a distinctly sloped surface from the base of the cliff to the sea.

Inverted funnel connected to thermoplastic tubing used to collect gas from a hot spring pool near Lassen Peak, California.

"Geologic map of the northeast flank of Mauna Loa volcano, Island of Hawai‘i," published by the U.S. Geological Survey in May 2017, shows the distribution of lava flows and other deposits covering an area from Pu‘u‘Ula‘ula ("Red Hill") on the southwest to Hilo on the northeast.

Geologists visiting the June 26 breakout today (July 13) found the front (pictured) stalled with no active lava visible. There has been no significant advancement of the flow front since July 8, and is still 2.2 km (1.4 miles) from the road.

This video clip (at x30 speed) shows the pāhoehoe breakouts on the coastal plain.

There have been no major changes at the Kamokuna ocean entry or lava delta. The delta remains unstable, with a large crack (noted earlier this week) that spans the entire width of the delta.

A wider view of the lava lake in the Overlook crater, taken from the rim of Halema‘uma‘u Crater (closed to the public due to volcanic hazards).

Spattering is common in the summit lava lake in Halema‘uma‘u Crater. This afternoon, spattering was active at a site along the east lake margin. Spatter deposits have built a small ledge extending out from the crater walls (lower right of photo), onto which fluid spatter often falls.

A view of the outgassing plume produced by the summit lava lake. The photo was taken from Uēkahuna Bluff, near HVO and the National Park Service Jaggar Museum.

This map shows recent changes to Kīlauea's East Rift Zone lava flow field. The area of the active flow field as of June 21 is shown in pink, while widening and advancement of the active flow as of July 10 is shown in red. Older Pu‘u ‘Ō‘ō lava flows (1983-2016) are shown in gray. The yellow line is the trace of the active lava tube.

This video clip gives a view of the ocean entry and the cracks on the lava delta.

The June 26 breakout remains active at the flow front, which can be distinguished by the light silver color at the bottom-center of the photo.