"On 19 May seismicity at Fuego increased and explosions were heard at 5-10 minute intervals. A 600-m-long lava flow descended the W flank, and a 1-km-long and 20-m-wide lava flow descended the E flank, reaching the base of the volcano. Explosions ejected incandescent tephra 400 m above the crater, and produced ash plumes that rose 5 km above the crater and drifted 30 km S and SW. Coordinadora Nacional para la Reducción de Desastres (CONRED) raised the Alert Level to Orange (the second highest level on a 4-color scale). Pyroclastic flows also descended the flanks, prompting authorities to restrict passage on part of a highway. Ash plumes from the pyroclastic flows rose 3 km above the crater. Ashfall was reported in Morelia (7 km SW), Panimaché I and II (9 km SW), Sangre de Cristo (8 km WSW), and Yepocapa (8 km WNW). Thirteen people from El Porvenir in Alotenango (8 km ENE) evacuated to local shelters. Visual observations and seismicity indicated that activity decreased later that day.
On 20 May a few explosions generated ash plumes that rose 500 m above the crater and drifted 8 km SW. The next day cloud cover prevented observations; however explosions, rumbling, and degassing sounds were reported. On 22 May explosions generated ash plumes that rose as high as 1 km and drifted 10 km S and SE. Rumbling was heard and shock waves were detected. The lava flows were inactive and only incandescence from block avalanches was observed." [less]

The eruption was both explosive and effusive. According to news, the eruption began at 2:45 a.m. with large explosions and lava fountains possibly up to 1 km high from the summit crater. Large incandescent bombs were ejected to considerable distances and showered the summit cone of the volcano. A 500 m long lava flow traveled down on the SW flank towards the Ceniza ravine. The eruption also produced an ash column reaching 5 km (16,000 ft altitude) and pyroclastic flows probably generated mostly by cascading lava blocks traveling down the steep cone's flank into Las Lajas, El Jute y Ceniza valleys.
Ash fall was reported from nearby villages mainly to the S and SW including Morelia, Panimaché I and II, Sangre Cristo and Yepocapa. [less]

The activity followed an increase of elevated SO2 emissions and seismic activity detected in late April. According to reports, the degassing from a crack in the main crater was accompanied by jet-like sounds, and internal rumblings can be heard at the volcano.
Latina Press mentions that scientists are closely monitoring the new activity, but so far, no emergency has been declared and the Masaya Volcano National Park remains open. [less]

During 11-15 April steam-and-gas emissions from Popocatépetl occasionally contained ash; emissions contained a substantial amount of ash on 12 April.
Seismicity increased on 13 April and at 2220 an explosion ejected incandescent blocks that landed on the NE flank as far as 500 m away from the crater rim. A larger explosion at 2236 ejected incandescent blocks that landed even further away on all flanks; an ash plume rose 2 km above the crater and drifted ENE. Ashfall was reported in San Pedro Benito Juarez (10-12 km SE), where the explosion was also heard. [less]

Local authorities are preparing for potential evacuations. The last time evacuations were ordered on a large scale was in 2000 when over 50,000 people had to leave their homes.
The major hazards of a larger eruption would be ash falls, pyroclastic flows, lahars produced by mixing of water and tephra. [less]

An 12 km exclusion zone was declared around the volcano. [less]

No further ash venting has occurred since 23 March. [less]

No more phreatic explosions and ash-venting episodes have been observed since 23 March. Seismic activity has returned to a low level as well and zone C on the island was reopened for day-time visits.
However, the volcano shows strong sulfur dioxide emission, suggesting that fresh magma might be flowing into a shallow reservoir. During 24-26 March, extremely high levels of SO2 emission rates were measured, up to 4,594 tonnes per day, the third highest value measured in 10 years. [less]

Several block lava flows are traveling down from the dome, and generate glowing avalanches. Frequent explosions produce ash plumes rising 800-900 m above the lava dome. An explosion on 26 March produced pyroclastic flow on the western flank of the cone.
Satellite images detected several plumes extending up to 33 km in south-westerly directions. Ash fall occurred in up to about 10 km distances in areas to the south at the Observatory Vulcanológico de Santiaguito (OVSAN), and to the SW at the El Faro, La Florida, and Patzulin ranches (SW), as well as in the village of Santa María de Jesús (SE). [less]

During 24-25 March, the volcano had 33 small steam and gas emissions, accompanied by small earthquakes and volcanic tremor. On Saturday night, incandescence was observed at the crater.
CENAPRED recommends a safety radius of 12 kilometers around the volcano as eruptions with higher intensity could occur any time. [less]

The ash emissions began at around 8 am local time on 23 March, following 2 volcanic earthquake swarms on 22 and 23 March, the Montserrat Volcano Observatory (MVO) reports.
[less]

San Salvador volcano is an active stratovolcano immediately northwest of the capital San Salvador City and last erupted in 1917.
[less]

The pyroclastic flow traveled about 1 km to the west towards Plymouth before its ash dissipated to form a small ash cloud rising 1.3 km and drifting towards St. Georges Hill and out to sea. MVO has published further details and photographs of this event which is significant as it occurred during a quiet phase of the volcano with no current active lava dome growth and illustrates the hazard of sudden pyroclastic flows.
"There were no precursors to this event. Although activity has generally been low, this event clearly illustrates that Soufrière Hills Volcano is still an active volcano and that pyroclastic flows can occur at any time with little to no warning." [less]

The latest monthly bulletin of Costa Rica's volcano observatory OBSICORI published a more detailed summary of Poás' activity during February summarized as follows:
The ultra-acid crater lake had a greenish-gray color with sporadic convection cells visible in the central part carrying sulfur in suspension. Lake temperature were measured at 44° C, which is a value significantly lower than those measured during most of 2009-2011. The pH value of the lake water was measured at 0.01, slightly "less" acidic than during November 2011 (pH -0.4). [less]

On 23 February, residents in Guachipelin (11 km to the SW) woke up to hear explosion sounds between 0400 and 0430 local time. Seismic recordings showed signals typical for explosions at the same time, although other residents in other areas did not hear any eruption.
Similar seismic signals were detected on 19 Feb at 00:16 and on 20 Feb at 00:46 local time, suggesting that smaller explosions occurred then as well. [less]

Light ash falls from these eruptions frequently occur in the villages San Marcos, Buena Vista and Palajunoj and the El Faro, Florida, and Monte Claro Fincas.
Crater glow at the summit of the lava dome is well visible at night, and a blocky lava flow with constant avalanches of blocks rolling down to tits base continues to be active, raising secondary ash plumes. [less]

(message from Eliecer Duarte, Volcano Monitoring Team, OVSICORI-UNA) [less]

The lava flow in the direction of Taniluyá is between 150-200 m long, and incandescent blocks detach from the front, tumbling down into the forested area. [less]

The new lava flow on the southwest flank in the direction of the Taniluya ravine is still active and about 200 m long. Blocks that detach from its front form small block avalanches that reach the vegetation. [less]

Authorities recommend a safety distance from the volcano of 12 km radius, and the alert level remains at "yellow". [less]

Rock avalanches traveled SW into the Ceniza drainage and on the W, S, and SW flanks. At night on 13 and 16 January incandescence was visible from the crater.
(Source: Smithsonian / GVP weekly activity report) [less]

The eruption was first noticed by park rangers and local residents.
During the previous day, numerous rumblings could be heard from the mountain. According to OVSICORI-UNA, the eruption started between 3:10 and 3:20 pm and produced an ash plume from a vent on the southeast flank of the main crater in an area known as "La Quemada". [less]

This decompression event released ash that was carried by the wind at least up to Tres Rios (27km SW from the vent). As a consequence the Comisión Nacional de Emergencias and the Turrialba Volcano National Park's administration declared a yellow alert and closed the access, which is still the case on January 17th. [less]

"There is no incandescence currently as part of the wall near the vent collapsed into it. Local people are expecting an eruption to clear it. One can hear churning and avalanches and there is quite a bit of gas you bed to put the mask on or you can only stay 10-15 min on lookout. The dormant crater next door looks like has a small lava dome in it which is slowly rising. The trees and plants don't grow properly maybe because of CO2 in this crater?" [less]

Gas-and-steam plumes rose from the lava dome.
(Smithsonian / USGS Weekly Volcanic Activity Report 28 December-3 January 2012) [less]