volcanodiscovery-July 9,2013
Tolbachik (Kamchatka): While the activity of lava effusion from the southern vent continues, the recent tremor measurements of KVERT have been showing a decreasing trend since mid June, after having been stable or even rising a bit since April. This means that the effusion rate is likely decreasing as well, but still, it is difficult to predict when the eruption will eventually end.
Chirpoi (Kurile Islands, Russia): A hot spot was again detected on MODIS satellite data, which suggests the presence of lava or hot gasses. However, visual satellite images showed no degassing plume, which would have confirmed possible activity at the volcano.
Sakurajima (Kyushu, Japan): A phase of strong activity started last Sunday. Following a week of almost no explosions, a series of relatively strong eruptions has started. On average, 4-5 explosions have occurred per day, with at least 5 stronger ones producing ash plumes to 10-12,000 ft (3-3.6 km) altitude.
Suwanose-jima (Ryukyu Islands): VAAC Tokyo reported a small ash plume from the volcano at 5,000 ft (1.5 km) elevation today. Likely, some stronger strombolian-type explosion has occurred at the volcano, whose activity is similar to Stromboli in Italy.
Veniaminof (Alaska Peninsula, USA): A significant increase in seismic activity has occurred today, which could suggest that the eruption is gaining strength. During the past days, it continued at low but steady levels with no major changes.
AVO reported low-level volcanic tremor and a thermal anomaly as well as occasional observations of weak incandescence indicate continuing lava effusion. Explosive activity, if at all, is minor.
Popocatépetl (Central Mexico): The volcano has been a bit calmer today, but still emits an impressive steam plume with some ash most of the time as well as occasional smaller explosions. VAAC reported the plume height at 22,000 ft (7 km) altitude drifting SW.
