It’s been a busy week in the realm of volcanoes. Let’s check out some highlights:
The coastline of the Big Island of Hawaii continues to change this week. The lava benches near the Kamokuna ocean entry (part of USGS geologists from the episode 61g lava flows) have been collapsing for the better part of a few months, and . A crack has formed along the coastline near the ocean entry, and over the last few days it —complete with creaking and groaning at night as the block of lava moves. Most likely, this will become another piece of the island that will fall into the sea. took some of the cracked lava bench and found that it reaches over 220ºC (428ºF) only a few meters below the surface.
The severed lava tubes continue to carry lava to the sea, creating some spectacular “hoses” of lava entering the ocean (ºC. This means that the lava can explode as it hits the ocean water and trapped steam in the magma tries to escape. These explosions are unpredictable and violent, so while these fountains of lava are impressive, they should be treated with caution—I’ve seen quite a few photos and videos of tourist boats coming perilously close to these ocean entries.above and below). It might seem like the lava is very similar to water, but it is both much more viscous (by a factor of 10,000 to 100,000!) and much hotter, likely erupting at temperatures around 1200
While searching for pumice rafts on satellite images in the area near Tonga, a Nuku’alofa.on January 27, 2017. The volcano in question, the ever-so-wonderfully named “ ” is only about 46 kilometers (29 miles) from the capital of Tonga, but poses no threat to the area at this point. The (based on back-tracking satellite images) and has produced an area of discolored water in the seas to the northwest of
Brad Scott from GNS Science said that(as I’ll call it) has been active a number of times over the last 50 years, with an impressive eruption in 1999 that produced a small, ephemeral island. SubVol-III is likely a composite volcano that lies under the surface of the Pacific Ocean. The summit of the volcano is likely only 10 to 20 meters below the surface, so the fact that this eruption has not produced explosive plumes (like we’ve been seeing at Alaska’s Bogoslof) suggests that it is a fairly minor eruption.
The eruption itself could have gone unnoticed except for the vigilant eyes of geomorphologist Murray Ford from the University of Auckland and the Earth-observing satellite. The (see above), showing that it stretches over an area over five kilometers (three miles) wide. This eruption from SubVol-III is the first noticed at the volcano since the 1999 eruption, but with its remote location (and being under the sea and all), other eruptions could have easily gone unnoticed. Submarine eruptions such as these .
Other volcano news:
in Italy continues to rumble after started last week. throwing lava bombs away from the new crater that has formed in the saddle between older vents on the Southeast Crater.
Eruptions atin Alaska appear to have settled down some, although the current activity seems to rise and fall rapidly. The has for the time being. was noticed on some nearby islands along the Aleutian chain, . The island home of Bogoslof has in mid-December 2016.
source : https://www.wired.com/2017/02/watch-kilaueas-lava-gush-sea-like-waterfall/