Roundup of Global Volcanic Activity:
Etna (Sicily, Italy): A swarm of shallow (3-6 km depth) earthquakes including several felt ones (magnitudes 2.9-3.5) occurred yesterday and today under the SE flank near Zafferana town. So far, no other unusual signs of activity have been reported, but the swarm could indicate something in the making, and the monitoring agency INGV is certainly following these events closely.
Paluweh (off Flores Island, Indonesia): Ash plumes rising to 10,000 ft (3 km) altitude have been observed yesterday and today. The lava dome obviously continues to be active and regularly produces explosions and/or rock avalanches that cause ash plumes.
Lassen (California): A shallow magnitude 5.7 earthquake occurred Fri, 24 May at 04:58 UTC km WNW of Greenville, California, about 50 km SE of Lassen volcano. Hundreds of aftershocks, some of them felt, have occurred. It is unlikely that the earthquake has any relation with the volcano. The status of Lassen volcano remains therefore at green.
Sangay (Ecuador): A possible ash emission occurred yesterday at 17:15 GMT, VAAC Washington reported. A pilot observed an ash plume at 25,000 ft (7.5 km) altitude drifting west from the volcano, but no ash could be detected on satellite data.