Your weekly dose of volcanism from the USGS/Smithsonian Global Volcanism Program.
Highlights (not counting Mayon), include:
- The activity at Mando Hararo in Ethiopia appears to be a fissure eruption. Ground observations saw a 4-5 kilometers / ~2.5-3 mile fissure with new predominantly 'a'a lava flows that were 2-3 m thick ... the fissure was lined with scoria ramparts 30-50 m high. They did not see any active lava, though.
- As some Eruptions readers have pointed out from the OMI SO2 maps, Sarychev Peak (Russia) is still producing gas-and-steam (with some ash) plumes, mostly drifting off to the east of the volcano.
- Shishaldin in the Aleutians saw its Alert status changed to Yellow/Advisory by AVO. A thermal anomaly seen via satellite in the crater has been growing more intense recently. The anomaly was first noticed in January of 2009. The volcano last erupted in 2004.
- Explosions and 4-4.5 km / 13,500-15,000 foot ash columns were produced at Fuego in Guatemala. There was also some incandescent ejecta spotted being thrown 75 m / ~250 feet from the crater.
- Shiveluch in Kamchatka (Russia) continues to rumble, with gas-and-steam plumes with ash produced by explosions reaching as high ~5.3 km / 13,400 feet.
Interesting that Shishaldin is brewing up again; I've always been fascinated by this volcano, one of those frequently-active but generally well-behaved ones that rarely make the news. Couple of odd facts: first known ascent in May 1932 by a team led by Jesuit priest/geologist Bernard Hubbard..who found that at that time it had no defined crater. It's also acquired a plethora of different names...Sisquk, Shishaldin, Caroli and the colloquial 'Smokin' Moses'
Well, then you should check out today's post : http://scienceblogs.com/eruptions/2009/07/is_something_up_at_shishaldin….
Could not have arrived at a much better time. Superb write-up.