Volcanos

Roundup of Global Volcanic Activity:

Popocatépetl (Central Mexico): Activity has not changed much and been relatively calm with 1-2 usually small emissions on average per hour. Glow remains visible at the summit. Accompanied by low-amplitude high frequency tremor, stronger ash emissions on 17 August occurred between 11:20 and 13:30(local time) and produced a plume of 1.5 km height, drifting WSW. Ash fall occurred in Tetela del volcán, Ocuituco, Yecapixtla, Tlayacapan, Cuautla, Ayala and Cuernavaca.

Fuego (Guatemala): A surge in effusive activity has occurred overnight. The two active lava flows towards the Taniluya (western flank) and Ceniza (southern flank) canyons increased to 600 and 800 m length, respectively. Numerous incandescent avalanches detach from the flow fronts and glowing blocks reach the vegetation limit.

Iliwerung (Lesser Sunda Islands): A submarine eruption has likely occurred this morning in Indonesia. VSI raised the alert level of Iliwerung volcano from 1 (normal) to 2 (watch) following increased seismic and visual activity from an underwater flank vent called Gunung Hobal. Iliwerung volcano forms a peninsula on the south coast of Lembata (Lomblen) Island (East Indonesia). Mount Hobal (Gunung Hobal) is a submarine flank vent of Iliwerung located about 800 m from the coast. It has had several historic eruptions during which several temporary islands were formed.

White Island (New Zealand): A small phreatic or hydrothermal eruption occurred at in the active crater earlier today (10:23 on Tuesday 20 August 2013 NZ local time). The explosion lasted for about 10 minutes and produced a steam plume mixed with small amounts of ash that rose about 4 km a.s.l. The activity at White Island has now returned to levels of high hydrothermal activity as before this morning's eruption.