August 2: Word of the Day – ‘Tombolo’

August 2, 2018. USGS: “During this morning’s overflight, HVO geologists used a telephoto lens to capture this image of the fissure 8 cone. Activity within the vent was low, with small bubble bursts in the eastern part of the vent and low lava fountains on the western side. The fountains occasionally threw spatter onto the west rim of the cone (right).” (Full-sized)
Today’s Eruption Summary

The eruption continues as usual, although lava levels “in the more distant portions of the channel system” are down somewhat. Nevertheless, an afternoon surge after today’s summit collapse caused an overflow and brushfire in an undeveloped area north of the channel, according to Civil Defense.

Today’s summit collapse came at 11:55 am HST, energy equivalent of an M 5.4. Once again there was a cluster of high M3 foreshocks in the ten minutes or so beforehand, so that there was already some suspended dust from rockfalls.

Northeast Rim livestream cam was stuttering today, but still dramatic.

Also note that HVO’s Fissure 8 webcam was damaged by a brushfire Tuesday and ceased working. In fact, right now it’s stuck on the last photo it took.

While checking on the main webcams page, I caught a lovely time of the evening up at the summit. From the ones that are working:

Former Overlook Vent cam, now pointed at a sheer cliff above where it used to be. (Full-sized)
HVO Panorama cam. All of these from about 6:40 pm HST. (Full-sized)
Halema’uma’u wide angle webcam. (Full-sized)

And speaking of photos, I took a night off, and come back to find HVO posted a ton of good photos! Which I shall mirror here so they’re easier to find after they’ve “fallen off” that Photo & Chronology page.

Most importantly, a new frame from the Cosmo-Skymed satellite radar animation:

Aug 1, 2018. USGS: “This animated GIF shows a sequence of radar amplitude images that were acquired by the Agenzia Spaziale Italiana CosmoSkyMed satellite system. The images illustrate changes to the caldera area of Kīlauea Volcano that occurred between May 5 and August 1 at about 6:00 a.m. HST.” (Full-sized

Accompanying text with this animation: “Over time, expansion of the summit eruptive vent within Halema‘uma‘u crater and the widening of Halema‘uma‘u itself are obvious. Starting in late May, the development of several cracks outside Halema‘uma‘u is clear, and inward slumping of a large portion of the western, southwestern, and northern crater rim begins. Much of this motion appears to be coincident with the small explosions from the summit that have taken place on a near daily basis since early June. The most recent radar scene, from August 1, shows continued motion along cracks over a broader area of the caldera floor, extending east of Halema‘uma‘u. We expect this slumping to continue as long as the collapse events and overall subsidence persist.”

Continue reading August 2: Word of the Day – ‘Tombolo’