Rockfall Triggers Explosive Event at Halema’uma’u

Just after 10 AM this morning, the southeastern wall of the Overlook crater, in Halemaʻumaʻu, collapsed and fell into the summit lava lake.

This image is a still taken from the webcam positioned on the rim of Halemaʻumaʻu at that location, showing spatter in the air directly in front of the camera.

This image is a still taken from the webcam positioned on the rim of Halemaʻumaʻu at that location, showing spatter in the air directly in front of the camera.

This triggered a small explosive event that threw spatter bombs onto the rim of Halemaʻumaʻu at the site of the tourist overlook, closed since 2008.

The lava fragments ejected ranged in size from dust-sized particles up to spatter bombs about 70 cm (~30 inches) across.

The larger clasts – the bombs – dotted the ground around the tourist overlook and webcam, giving the area a look reminiscent of a cow pasture.

The larger clasts – the bombs – dotted the ground around the tourist overlook and webcam, giving the area a look reminiscent of a cow pasture.

As has been seen with almost all previous explosive events at Halemaʻumaʻu since 2008, the spatter that was ejected was coated in dust and filled with small lithic fragments – clear evidence of the involvement of lithic wall rock.

The knife is 12 cm (4.5 in) long.

The knife is 12 cm (4.5 in) long.

Spatter landed on wooden fencing laying on the ground at the closed tourist overlook, igniting it in a few places.

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The part of the Overlook crater wall that collapsed is evident in the center of this photo by its white color.

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