All times are local unless otherwise stated.

Ahyi (United States) | 23 April-29 April 2014 | New Eruptive Activity Cite this Report
Ahyi Mariana Volcanic Arc	Seismic stations on Pagan, Sarigan, Anatahan, and Saipan began recording signals starting at 0635 on 24 April believed to be from an undersea volcanic source. Hydroacoustic sensors on Wake Island suggested that the source is at or near Ahyi seamount, although it was possible that the vent is located at one of the other volcanic seamounts in the area. While conducting coral reef research at Farallon de Pajaros, NOAA divers reported hearing loud explosions and feeling the shock waves. One of the more powerful explosions was felt by the crew as it reverberated through the hull of the ship. On 27 April the Color Code was raised from Unassigned to Yellow. A report issued at 0536 on 30 April noted that seismic activity remained high. Sources: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program, Bill Chadwick, Oregon State University's Marine Science Center and NOAA/PMEL EOI Program, personal communication
Merapi (Indonesia) | 23 April-29 April 2014 | New Eruptive Activity Cite this Report
Merapi Sunda Volcanic Arc	PVMBG reported that field observations of Merapi conducted two days after the explosion on 20 April revealed that a fracture in the dome had widened 70 m to the W, and new material had been deposited in the W part of the crater. The Alert Level remained at 1 (on a scale of 1-4). Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)
Aira (Japan) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Aira Ryukyu Volcanic Arc	JMA reported that seven explosions from Showa Crater at Aira Caldera’s Sakurajima volcano during 22-25 April ejected tephra as far as 1,300 m. Incandescence from the crater was detected at night. The Alert Level remained at 3 (on a scale of 1-5). The Tokyo VAAC reported that during 23-24 and 26 April plumes rose to altitudes of 2.1-3 km (7,000-10,000 ft) a.s.l. and drifted NW, W, and SE. On 26 April a pilot observed an ash plume that rose to an altitude of 2.7 km (9,000 ft) a.s.l. and drifted WNW. An explosion was reported on 29 April. Sources: Japan Meteorological Agency (JMA), Tokyo Volcanic Ash Advisory Center (VAAC)
Batu Tara (Indonesia) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Batu Tara Sunda Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 27-28 April ash plumes from Batu Tara rose to an altitude of 3 km (10,000 ft) a.s.l. and drifted 35-55 km NE and N. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Chirinkotan (Russia) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Chirinkotan Kuril Volcanic Arc	SVERT reported that satellite images of Chirinkotan showed gas-and-steam emissions on 25 and 27 April. Cloud cover obscured views during 21-28 April. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Chirpoi (Russia) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Chirpoi Kuril Volcanic Arc	SVERT reported that satellite images over Snow, a volcano of Chirpoi, detected a thermal anomaly on 21 and 27 April. Cloud cover obscured views on the other days during 22-28 April. The Aviation Color Code remained at Yellow. Source: Sakhalin Volcanic Eruption Response Team (SVERT)
Dukono (Indonesia) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Dukono Halmahera Volcanic Arc	Based on analyses of satellite imagery and wind data, the Darwin VAAC reported that during 23-29 April ash plumes from Dukono rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted 55-150 km E, ESE, and SE. Source: Darwin Volcanic Ash Advisory Centre (VAAC)
Fuego (Guatemala) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Fuego Central America Volcanic Arc	INSIVUMEH noted in a special report from 25 April that explosions at Fuego were occurring at a rate of 5-6 per hour, generating ash plumes that rose 350-650 m above the crater and drifting 10 km S and SW. Ashfall was reported in Panimaché, Morelia, and Santa Sofía; shock waves vibrated houses in those three towns among others. Avalanches of incandescent blocks reached vegetated areas. Explosions during 26-28 April produced ash plumes that rose 350-800 m and drifted 10 km W. Villagers in Panimaché, Morelia, and Santa Sofía again reported vibrating houses and ashfall. Block avalanches originated from the crater and descended the flanks. During 28-29 April explosions were detected at a rate of 6-8 per hour. Ash plumes rose 750 m and drifted 10 km W and NW. Explosions caused houses on the SW flank to vibrate. Source: Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hidrologia (INSIVUMEH)
Karymsky (Russia) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Karymsky Eastern Kamchatka Volcanic Arc	KVERT reported that Vulcanian and Strombolian activity continued at Karymsky during 17-25 April. Satellite images detected a thermal anomaly on the volcano on 19 and 22; cloud cover obscured views on the other days. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kīlauea (United States) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Kīlauea Hawaiian-Emperor Hotspot Volcano Group	During 23-29 April HVO reported that the circulating lava lake occasionally rose and fell in the deep pit within Kīlauea's Halemaʻumaʻu Crater. Gas emissions remained elevated. The plume from the vent continued to deposit variable amounts of ash, spatter, and Pele's hair onto nearby areas; smaller particles may have been dropped several kilometers away. During 28-29 April the lake level rose to an estimated 30 m below the crater floor, the highest level measured since February 2013. At Puʻu ʻŌʻō Crater, glow emanated from spatter cones on the N and S portions of the crater floor, and from the lava pond in the NE spatter cone. On 22 April, just before midnight, the N spatter cone produced a vigorous lava flow that traveled E across the crater floor in minutes, over the crater edge, and then down the NE flank of the cone along the Kahauale’a 2 lava flow tube. The flow continued to be sporadically active during the rest of this reporting period. The Kahauale’a 2 lava flow continued to advance, with breakouts from the main stalled lobe, and burn adjoining forest. On 28 April geologists mapped the farthest point of activity, 8.3 km NE of Pu’u 'O'o. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Sheveluch (Russia) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	KVERT reported that during 18-25 April lava-dome extrusion onto Shiveluch’s SE flank was accompanied by ash explosions, incandescence, hot avalanches, and fumarolic activity. Satellite images showed a bright thermal anomaly daily. The Aviation Color Code remained at Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Shishaldin (United States) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Shishaldin Aleutian Ridge Volcanic Arc	AVO reported that although cloud cover occasionally prevented web-cam and satellite observations of Shishaldin's summit area during 23-29 April, periods of elevated surface temperatures and minor steaming were observed. No significant changes were detected in seismic data. The Aviation Color Code remained at Orange and the Volcano Alert Level remained at Watch. Source: US Geological Survey Alaska Volcano Observatory (AVO)
Suwanosejima (Japan) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Suwanosejima Ryukyu Volcanic Arc	The Tokyo VAAC reported that on 29 April an explosion at Suwanosejima produced a plume that rose to an altitude of 1.2 km (4,000 ft) a.s.l. and drifted E. Source: Tokyo Volcanic Ash Advisory Center (VAAC)
Ubinas (Peru) | 23 April-29 April 2014 | Continuing Eruptive Activity Cite this Report
Ubinas Central Andean Volcanic Arc	IGP's Observatorio Volcanologico de Arequipa (IGP-OVA) and Observatorio Vulcanológico del INGEMMET (OVI) reported that during 23-28 April daily explosions at Ubinas generated ash plumes that rose 0.2-2.5 km above the crater and drifted in multiple directions, especially to the S, SE, and E. Ash fell in various towns downwind of the plumes including Querapi (4 km S), Ubinas (6.5 km SSE), Escacha, Yungas, and Chojata. Seismicity was at a low level; signals indicating magma ascent were absent. Sources: Instituto Geofísico del Perú (IGP), Instituto Geológico Minero y Metalúrgico (INGEMMET)

Since the Weekly Volcanic Activity Report began in November 2000, there have been 22,859 individual reports over 1,335 weeks (average of 17 per week) on 351 different volcanoes.

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Criteria

The Weekly Volcanic Activity Report does not necessarily include all volcanic activity that occurred on Earth during the week. More than a dozen volcanoes globally have displayed essentially continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Submarine activity is reported when information is available. The Weekly Volcanic Activity Report summarizes volcanic activity that meets one or more of the following criteria:

- A volcano observatory raises or lowers the alert level at the volcano.
- A volcanic ash advisory has been released by a volcanic ash advisory center (VAAC) stating that an ash cloud has been produced from the volcano.
- A verifiable news report of new activity or a change in activity at the volcano has been issued.
- Observers have reported a significant change in volcanic activity. Such activity can include, but is not restricted to, pyroclastic flows, lahars, lava flows, dome collapse, or increased unrest.

Reports categorized as "Activity (New)" indicate eruptive activity that has occurred after at least 3 months of quiescence. Once a volcano is included in this section, updates will remain on that list unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Activity (Continuing)" section. Reports are included in the "Unrest" sections (New or Continuing) if the volcano is undergoing non-eruptive activity such as seismicity or deformation that is unusually high for that volcano or is increasing. The "Other" category includes non-eruptive and non-unrest reports, such as Alert Level decreases or previous ash deposits resuspended by winds. Reports through 2025 were only divided into "New Activity/Unrest" and "Continuing Activity", which have been automatically converted to the "Activity (New)" and "Activity (Continuing)" groups, respectively, without a review of content that might change the category to "Unrest" or "Other".

It is important to note that volcanic activity meeting one or more of these criteria may occur during the week, but may not be included in the Weekly Volcanic Activity Report because we did not have the relevant information at the time.

Disclaimers

1. The Weekly Volcanic Activity Report is intended to provide timely information about global volcanism on a weekly basis. Consequently, the report is generated rapidly by summarizing volcanic reports from various sources, with little time for fact checking. The accuracy of the Weekly Volcanic Activity Report is dependent upon the quality of the volcanic activity reports we receive. Reports published in the Bulletin of the Global Volcanism Network are cover longer time periods and are more carefully reviewed, although all of the volcanoes discussed in the Weekly Volcanic Activity Report are not necessarily reported in the Bulletin. Reports are updated on the Weekly Volcanic Activity Report web page as they are received, therefore information may be included regarding events that occurred before the current report period.

2. Rapidly developing events lead to coverage that is often fragmentary. Volcanoes, their eruptions, and their plumes and associated atmospheric effects are complex phenomena that may require months to years of data analysis in order to create a comprehensive summary and interpretation of events.

3. Preliminary accounts sometimes contain exaggerations and "false alarms," and accordingly, this report may include some events ultimately found to be erroneous or misleading.

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