The Lower East Rift Zone eruption continues as per usual. USGS reported during today’s morning overflight that “the channel was incandescent its entire length from vent to ocean entry.” There’s a main ocean entry a few hundred meters NE of the southern flow border with smaller pahoehoe flows on either side. The southern margin doesn’t seem to have advanced much from yesterday.
No other fissures are active, and I already covered yesterday’s 4:33 HST collapse event. I’m betting the next one will be after dark.
Janet Babb, Kīlauea Update: Good afternoon, everyone.
On the Lower East Rift Zone, Fissure 8 is still active. It continues to erupt lava into the perched channel that extends down on the west side of Kapoho Crater and feeds lava into the ocean. This morning, the main ocean entry was a little bit west of Ahalanui, with the flow margin about 500 meters, or 0.3 mile, from the Pohoiki boat ramp. There’s still some weak ocean entry points to the north of this main entry over near the Kapoho Bay lobe of lava where there were some weak, wispy plumes there. The flow front along the ocean, along the coast is still about 6 kilometers wide or 3.7 miles wide. On the Lower East Rift Zone, the sulfur dioxide emissions remain high, and the ocean entry hazards include the laze plume, as well as the possible hydrovolcanic explosions, what we referred to on Monday as “littoral explosions.” Hydrovolcanic is a little more intuitive word to explain the lava-seawater interaction.
Up at the summit, as we speak earthquakes are occurring at a rate of about 25-30 per hour as the volcano builds up to the next collapse event [this phonecall at 1 pm, collapse came at 4:33 pm.] The previous collapse event weas at 1:28 am July 18, so it’s been about 36 hours. We are within that time interval where we typically see these collapses occur. At the summit, the sulfur dioxide emissions are low. We’ll be posting some new photos and a new map shortly after this media call. That’s all.
And we’re back to routine, except that Fissure 8’s providing a minor puzzle to keep HVO busy. Yesterday it didn’t exhibit the surge behavior that’s been typical after summit collapses for the week or so. Today, nowhere near the time of a collapse event, “surging was noted at the Fissure 8 cone during the [morning] overflight but had stopped by the time ground crews arrived to verify it.” Otherwise, the channel’s lava level was low this morning. No other were fissures active.
Both the strong southern ocean entry and weak “ooze-outs” north along the edge of the lava delta continue. Onshore, the southern margin of the flow front was reported to be half a mile from the Pohoiki boat ramp this morning. Unfortunately, that flow edge has stalled but not stopped, and a DLNR official warned Isaac Hale Park is still within its sights.
We’re still awaiting the next summit collapse, which looks like it’s going to thwart HVO’s new “Northeast Caldera Rim” livestream by happening at night.
The split-second info card at the end says the floor of Halemaʻumaʻu Crater has dropped 450 m (1480 ft). Prior to the current eruption, it was 85 m (~280 feet) deep. So it’s about 1760 feet deep now. (World Trade Center One is 1776.)