Photo and Video Chronology - Kīlauea - April 28, 2015

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Lava lake level remains high, rockfall triggers explosive event

 

Lava lake level remains high, rockfall triggers explosive event...

A rockfall from the wall of Halema‘uma‘u Crater impacted the lava lake around 10:20 am, triggering an explosion of spatter and smaller particles. HVO geologists working on the far side of the crater captured the initial moments of the plume rising. The explosion deposited a large amount of spatter around the closed Halema‘uma‘u visitor overlook.

(Public domain.)

Quicktime movie of the rockfall and subsequent explosion at 10:20 a...

Quicktime movie of the rockfall and subsequent explosion at 10:20 a.m., HST, on April 28, 2015. Rocks falling into the summit lava lake generated an explosion that threw large fragments of molten lava onto the rim of Halema‘uma‘u Crater, 85 m (280 ft) above the lake. These fragments pose a significant hazard, and are one reason this area remains closed.

(Public domain.)

A closer look at the Halema‘uma‘u Crater overlook. The large bould...

A closer look at the Halema‘uma‘u Crater overlook. The large boulders were ejected during the 1924 explosion, but today's explosive event carpeted the ground with many large pieces of brown spatter.

(Public domain.)

A close look at one of the large pieces of spatter thrown onto the ...

A close look at one of the large pieces of spatter thrown onto the rim of Halema‘uma‘u Crater by today's explosion (keys are for scale). The spatter hit the ground in a semi-fluid state, deforming on impact. The small, multi-colored particles incorporated in the spatter are fragments of the altered crater wall that collapsed into the lake, while the brown spatter represents fresh lava from the lake.

(Public domain.)

The explosion threw spatter that hit the remaining fencing on the H...

The explosion threw spatter that hit the remaining fencing on the Halema‘uma‘u overlook, partly burning it. Keys for scale.

(Public domain.)

Portions of the Halema‘uma‘u overlook fencing were knocked down by ...

Portions of the Halema‘uma‘u overlook fencing were knocked down by previous explosive events, and also by the wind over the past several years. The downed fencing, shown smoldering here, was then ignited by hot spatter from today's explosive event.

(Public domain.)

Spatter from the explosion also landed on the Halema‘uma‘u webcam, ...

Spatter from the explosion also landed on the Halema‘uma‘u webcam, melting some of the wire insulation but not enough to interrupt its operation.

(Public domain.)

Gas in the lava lake was rapidly released during the 10:20 am explo...

Gas in the lava lake was rapidly released during the 10:20 am explosive event, causing the lava lake surface to drop a few meters (yards). This photo was taken moments after the explosive event, and shows the overhanging ledge of lava along the rim that was exposed as the lava level dropped.

(Public domain.)

Early this morning, prior to the explosive event at 10:20 am, the l...

Early this morning, prior to the explosive event at 10:20 am, the lake was close to the floor of Halema‘uma‘u Crater, with spattering along the lake margin.

(Public domain.)

This photo shows another view of the lava lake, from a different pe...

This photo shows another view of the lava lake, from a different perspective, when it was at its highest level.

(Public domain.)

Lava lake reaches new high level...

This photo shows the lava lake in the Overlook crater this morning, when it reached to within 3 m (10 ft) of the floor of Halema‘uma‘u. This is the highest the lava lake has reached during the current summit eruption.

(Public domain.)

 

This is a view of spattering at the east corner of the lava lake th...

This is a view of spattering at the east corner of the lava lake this morning.

(Public domain.)

Another view of spattering this morning....

Another view of spattering this morning.

(Public domain.)