All times are local unless otherwise stated.

Chikurachki (Russia) | 23 March-29 March 2005 | New Activity / Unrest Cite this Report
Chikurachki Kuril Volcanic Arc	On 25 March, KVERT raised the Concern Color Code at Chikurachki from Yellow to Orange. On 23 March, satellite imagery showed a weak ash plume extending ~70 km (~44 mi) E of the volcano. The height of the plume was unknown. The Concern Color Code was originally raised from Green to Yellow on 12 March when explosions were first noted. Chikurachki is not monitored with seismic instruments. KVERT has satellite data and occasional visual observations of the volcano. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Klyuchevskoy (Russia) | 23 March-29 March 2005 | New Activity / Unrest Cite this Report
Klyuchevskoy Eastern Kamchatka Volcanic Arc	On 24 March KVERT raised the Concern Color Code at Kliuchevskoi to Red (the highest level) due to an increase in seismic and volcanic activity. According to visual and video data, a gas-and-steam plume containing ash rose to ~7.5 km (24,600 ft) a.s.l. on 22 March, and ~8.5 km (~27,900 ft) a.s.l. on 23 March, extending NW. Ash fell in the town of Kluchi during 23-24 March. According to data from AMC Yelizovo, an ash plume that rose to ~7 km (~23,000 ft.) a.s.l. and extended 70-80 km (44-50 mi) to the NW was observed by pilots on 23 March. During about 27-28 March seismic activity at Kliuchevskoi decreased, leading KVERT to reduce the Concern Color Code to Orange. According to visual and video data, a gas-and-steam plume containing some ash rose ~200 m above the crater (~16,500 ft a.s.l.) and extended W during 27-28 March. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)

Anatahan (United States) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Anatahan Mariana Volcanic Arc	The third eruption in 2005 at Anatahan apparently began on 21 March when seismicity increased. Seismic amplitudes peaked on the 25th and faded out on the 26th. Near the peak on the 25th, the Air Force Weather Agency detected a hot spot on the island on satellite imagery, and reported an ash plume briefly reaching ~5.8 km (~19,000 ft) a.s.l. The plume height soon declined to below 3 km (10,000 ft) a.s.l., and by near midday on the 27th the plume had transitioned from ash and steam, to steam and vog (fog composed of volcanic gases). On the 27th the plume extended ~240 km (~130 nautical mi) SW. Sources: Emergency Management Office of the Commonwealth of the Mariana Islands and United States Geological Survey Volcano Hazards Program, Washington Volcanic Ash Advisory Center (VAAC)
Colima (Mexico) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Colima Trans-Mexican Volcanic Belt	During 23-29 March there were several ash emissions from Colima. Resultant ash plumes rose to a maximum height of ~7.6 km (~24,900 ft) a.s.l. Source: Washington Volcanic Ash Advisory Center (VAAC)
Ebeko (Russia) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Ebeko Kuril Volcanic Arc	There was no seismic activity at Ebeko during 18-25 March, so KVERT reduced the Concern Color Code from Yellow to Green, the lowest level. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
Kilauea (United States) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Kilauea Hawaiian-Emperor Hotspot Volcano Group	On 29 March lava from Kilauea entered the ocean at five ocean entries. The largest, named Kamoamos, consisted of six or more places where lava entered the water along the front of a growing lava delta. A cascade of lava streamed down the old sea cliff at one of the two Highcastle entries. Bright glow came from Ka`ili`ili entry, and weak glow from East Highcastle entry. Seismicity remained above background levels at Kilauea's summit, consisting mainly of tremor and some long-period earthquakes. Volcanic tremor was at moderate levels at Pu`u `O`o. Surface waves from a M 8.7 earthquake on 28 March off Sumatra, Indonesia disturbed tilt measurements at Kilauea, otherwise the tilt change was small. Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Manam (Papua New Guinea) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Manam Bismarck Volcanic Arc	Mild eruptive activity continued at Manam during 22-28 March. Weak-to-moderate emissions from both the Main and Southern craters continued to produce occasional ash clouds during most days. On 24 March, emissions from Main Crater rose to ~1 km above the summit (~9,200 ft a.s.l.). On 28 March, a moderate explosion produced an ash plume to a height of ~1.2 km above the summit (~9,900 a.s.l.). Ash plumes drifted N, depositing ash on the island. Seismic activity fluctuated between low and moderate, with low-frequency earthquakes recorded. Manam remained at Stage 2 Alert Level. Sources: Darwin Volcanic Ash Advisory Centre (VAAC), Rabaul Volcano Observatory (RVO)
Rabaul (Papua New Guinea) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Rabaul Bismarck Volcanic Arc	During 22-28 March, eruptions continued at Rabaul caldera's active Tavurvur cone every 10-20 minutes. These intervals were longer than during the previous weeks. Ash clouds rose several hundred meters above the summit. Moderate ash fell in Rabaul Town during 25-28 March. There were 100-200 earthquakes daily associated with the eruption. No changes were recorded in ground deformation. People were discouraged from entering within 1 km of the erupting vent. Source: Rabaul Volcano Observatory (RVO)
Sheveluch (Russia) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Sheveluch Eastern Kamchatka Volcanic Arc	The lava dome at Shiveluch continued to grow during 18-25 March. A lava flow traveled from a portion of the lava dome that was destroyed during an eruption on 28 February. During the report period, gas-and-steam plumes rose to ~1 km above the 2.5-km-high lava dome (~11,500 ft a.s.l.). Shiveluch remained at Concern Color Code Orange. Source: Kamchatkan Volcanic Eruption Response Team (KVERT)
St. Helens (United States) | 23 March-29 March 2005 | Continuing ActivityCite this Report
St. Helens High Cascades Volcanic Arc	During 23-29 March, growth of the new lava dome inside the crater of Mount St. Helens continued, accompanied by low rates of seismicity, low emissions of steam and volcanic gases, and minor production of ash. CVO noted that during such eruptions, episodic changes in the level of activity can occur over days to months. During about 26-27 March, a group of M 2 to M 3 earthquakes occurred beneath the volcano, a level of activity considered normal during dome-emplacing volcanism. Source: US Geological Survey Cascades Volcano Observatory (CVO)
Tungurahua (Ecuador) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Tungurahua Northern Andean Volcanic Arc	During 23-28 March, volcanic and seismic activity were at relatively low levels at Tungurahua. Low-energy gas-and-steam plumes were emitted, and long-period earthquakes were recorded. Source: Instituto Geofísico-Escuela Politécnica Nacional (IG-EPN)
Ulawun (Papua New Guinea) | 23 March-29 March 2005 | Continuing ActivityCite this Report
Ulawun Bismarck Volcanic Arc	During 25-28 March, volcanic and seismic activity at Ulawun were at low levels. Gas was emitted from the main crater, and low-frequency earthquakes were recorded beneath the volcano. Small-amplitude continuous volcanic tremor was recorded during 27-28 March. Source: Rabaul Volcano Observatory (RVO)

Weekly Reports Archive

Since the Weekly Volcanic Activity Report began in November 2000, there have been 20,531 individual reports over 1,239 weeks (average of 17 per week) on 336 different volcanoes.

Use the dropdowns to choose the year and week for archived Weekly Reports.

 News Feeds and Google Placemarks

 Criteria & Disclaimers

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 more-or-less continuous eruptive activity for decades or longer, and such routine activity is typically not reported here. Moreover, Earth's sea-floor volcanism is seldom reported even though in theory it represents the single most prolific source of erupted material. 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.

Volcanoes are included in the "New Activity/Unrest" section of the Weekly Volcanic Activity Report if the activity occurs after at least 3 months of quiescence. Once a volcano is included in the "New Activity/Unrest" section, updates will remain in that section unless the activity continues for more than 1 month without escalating, after which time updates will be listed in the "Continuing Activity" section. Volcanoes are also included in the "New Activity/Unrest" section if the volcano is undergoing a period of relatively high unrest, or increasing unrest. This is commonly equal to Alert Level Orange on a scale of Green, Yellow, Orange, Red, where Red is the highest alert. Or alert level 3 on a scale of 1-4 or 1-5.

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 receive a report.

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. Because of our emphasis on rapid reporting on the web we have avoided diacritical marks. 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.

4. Many news agencies do not archive the articles they post on the Internet, and therefore the links to some sources may not be active. To obtain information about the cited articles that are no longer available on the Internet contact the source.

5. USGS Disclaimer Statement for this Website:

Information presented on this website is considered public information and may be distributed or copied. Use of appropriate byline/photo/image credit is requested. We strongly recommend that USGS data be acquired directly from a USGS server and not through other sources that may change the data in some way. While USGS makes every effort to provide accurate and complete information, various data such as names, telephone numbers, etc. may change prior to updating. USGS welcomes suggestions on how to improve our home page and correct errors. USGS provides no warranty, expressed or implied, as to the accuracy, reliability or completeness of furnished data.

Some of the documents on this server may contain live references (or pointers) to information created and maintained by other organizations. Please note that USGS does not control and cannot guarantee the relevance, timeliness, or accuracy of these outside materials.

For site security purposes and to ensure that this service remains available to all users, this government computer system employs software programs to monitor network traffic to identify unauthorized attempts to upload or change information, or otherwise cause damage. Unauthorized attempts to upload information or change information on this website are strictly prohibited and may be punishable under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act. Information may also be used for authorized law enforcement investigations. (Last modified September 21, 1999.)

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
URL: https://volcano.si.edu/reports_weekly.cfm

 Acronyms and Abbreviations

a.s.l. - above sea level

AVO - Alaska Volcano Observatory

AVHRR - Advanced Very High Resolution Radiometer

CENAPRED - Centro Nacionale de Prevencion de Desastres (México)

CONRED - Coordinadora Nacional para la Reducción de Desastres

COSPEC - Correlation Spectrometer

CVGHM (formerly VSI) - Center of Volcanology and Geological Hazard Mitigation

CVO - Cascades Volcano Observatory (USGS)

GMS - Geostationary Meteorological Satellite

GOES - Geostationary Operational Environmental Satellite

GVO - Goma Volcano Observatory

GVP - Global Volcanism Program (Smithsonian Institution)

HVO - Hawaiian Volcano Observatory (USGS)

ICE - Instituto Costarricense de Electricidad (Costa Rica)

IG - Instituto Geofísico (Ecuador)

IGNS - Institute of Geological and Nuclear Sciences (New Zealand) - now GNS Science

INETER - Instituto Nicaragüense de Estudios Territoriales (Nicaragua)

INGEMMET - Instituto Geológical Minero y Metalúrgico (Peru)

INGEOMINAS - Instituto Colombiano de Geología y Minería (Colombia)

INGV-CT - Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Catania (Italy)

INSIVUMEH - Instituto Nacional de Sismologia, Vulcanologia, Meteorologia e Hidrologia (Guatemala)

IRD - Institut de Recherche pour le Développement (France)

JMA - Japanese Meteorological Agency

KEMSD - Kamchatkan Experimental and Methodical Seismilogical Department

KVERT - Kamchatkan Volcanic Eruption Response Team

M - magnitude

METEOSAT - Meteorological Satellite

MEVO - Mount Erebus Volcano Observatory

MODIS - Moderate Resolution Imaging Spectroradiometer

MVO - Montserrat Volcano Observatory

MWO - Meteorological Watch Office

NEIC - National Earthquake Information Center

NIED - National Research Institute for Earth Science and Disaster Prevention (Japan)

NOAA - National Oceanic and Atmospheric Administration

NOTAM - Notice to Airmen

OVDAS - Observatorio Volcanologico de los Andes del Sur (Chile)

OFDA - Office of US Foreign Disaster Assistance

ONEMI - Oficina Nacional de Emergencia - Ministerio del Interior (Chile)

OVPDLF - Observatoire Volcanologique du Piton de la Fournaise (France)

OVSICORI-UNA - Observatorio Vulcanologico y Sismologico de Costa Rica, Universidad Nacional (Costa Rica)

PHIVOLCS - Philippine Institute of Volcanology and Seismology (Philippines)

RSAM - Real-time Seismic Amplitude Measurement

RVO - Rabaul Volcano Observatory

SERNAGEOMIN - Servicio Nacional de Geologia y Mineria (Chile)

SIGMET - Significant Meteorological Information

SNET - Servicio Nacional de Estudios Territoriales (El Salvador)

SVERT - Sakhalin Volcanic Eruption Response Team (Russia)

USAID - US Agency for International Development

USGS - United States Geological Survey

UTC - Coordinated Universal Time

VAAC - Volcanic Ash Advisory Center

VAFTAD - Volcanic Ash Forecast Transport And Dispersion

VDAP - Volcano Disaster Assistance Program (USGS)

VHP - Volcano Hazards Program (USGS)

VRC - Volcano Research Center (Japan)