Volcanos

Roundup of Global Volcanic Activity:

Stromboli (Eolian Islands, Italy): Activity (both tremor and strength of explosions) seems to have decreased a bit for the moment. No new lava overflows were seen. During Saturday, we noticed that the vibrations caused by the strong explosions of the NE cone felt had become longer-lasting.

Etna volcano (Italy): Short eruptive phase have occurred at intervals of 1-2 days at both Bocca Nuova and the New SE crater.

Tolbachik (Kamchatka, Russia): Tremor amplitude has decreased a bit during the past 24 hours, but lava flows continue to be active.

Shiveluch (Kamchatka): The lava dome continues to grow. A moderate explosion occurred last night, producing an ash plume that rose to between 8,000 ft (1.8 km) (VAAC Tokyo) and 13,000 ft (4 km) (KVERT) altitude. KVERT reports moderate seismicity and strong gas-steam activity.

Colima (Western Mexico): The volcano continues to wake up and become more active. At least 3 ash explosions have occurred over the weekend (two on Saturday, one on Sunday). The eruptions produced relatively small ash plumes rising a few hundred meters. A 5 km radius from the summit exclusion zone is in effect at the National Park.

Popocatépetl (Central Mexico): The rate of emissions has decreased to less than 1 per 2 hours, but activity remains essentially unchanged with small steam and ash explosions, glow from the slowly growing dome, strong SO2 emissions and occasional small earthquakes.

Santiaguito (Guatemala): Activity remains relatively low. No recent explosions were reported. The lava flows on the southern and SE side of the dome continue to produce glowing avalanches.

Fuego (Guatemala): Activity remains low and mostly effusive. There were 7 weak strombolian explosions during 19-20 Jan. The lava flow has increased to 600 m length on 20 Jan morning.

Concepción (Nicaragua): Seismic activity (numbers and magnitudes of volcanic earthquakes) has decreased.

San Cristobal (Nicaragua): Volcanic earthquakes continue to diminish in number and amplitude.

Masaya (Nicaragua): Volcanic tremor is present and fluctuates at low energy levels. Nevado del Ruiz (Colombia): Numerous volcanic earthquakes, sometimes of higher energy levels continue to occur beneath the volcano. Weak periodic (at 45 min to 1 hour intervals) volcanic tremor appeared at during 20 Jan.

Machin (Colombia): Many tiny earthquakes continue to occur beneath the volcano.

Reventador (Ecuador): Strong seismic activity with many volcanic quakes and tremor accompanies strong degassing and sometimes small explosions from the growing lava dome. The activity seems currently to be increasing.

Tungurahua (Ecuador): Activity has remained low. Small earthquakes and weak tremor continue to be recorded with an increase visible on the most recent seismogram.

Villarrica (Central Chile): Weak, deep-seated explosive activity has appeared during the past 2 weeks, POVI reported. This is the first activity in about 6 months and it is expected that during the coming months this could again bring lava visible to the surface.

White Island (New Zealand): Volcanic tremor remains strong, but there is no surface activity.

Ruapehu (New Zealand): Seismicity remains low.

Mammoth Mountain (California, USA): A small earthquake swarm occurred at Mammoth Mountain during 14-20 Jan and seems to have ended.

Spurr (Cook Inlet, SW Alaska): Small local earthquakes continue to appear on seismic recordings.

Tanaga (Aleutian Islands): Relatively high numbers of small earthquakes continue to be recorded at the volcano.

Makushin (Aleutian Islands): Occasional small local earthquakes have been recorded recently.