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Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

You are currently viewing Archived reports for the week of 30 July-5 August 2003.


















 Activity for the week of 30 July-5 August 2003

The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program. Updated by 2300 UTC every Wednesday, notices of volcanic activity posted on these pages are preliminary and subject to change as events are studied in more detail. This is not a comprehensive list of all of Earth's volcanoes erupting during the week, but rather a summary of activity at volcanoes that meet criteria discussed in detail in the "Criteria and Disclaimers" section. Carefully reviewed, detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism Network.

Name Location Activity
Dieng Volcanic Complex Central Java (Indonesia) New
Gamalama Halmahera (Indonesia) New

Bezymianny Central Kamchatka (Russia) Ongoing
Colima Mexico Ongoing
Dukono Halmahera (Indonesia) Ongoing
Etna Sicily (Italy) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Klyuchevskoy Central Kamchatka (Russia) Ongoing
Popocatepetl Mexico Ongoing
Semeru Eastern Java (Indonesia) Ongoing
Soputan Sulawesi (Indonesia) Ongoing
Soufriere Hills Montserrat Ongoing


New Activity / Unrest


Volcano index photo  Dieng Volcanic Complex  | Central Java (Indonesia)  | 7.2°S, 109.879°E  | Elevation 2565 m

Mud flowed from Dieng's Sileri crater during the night of 20 July, traveling as far as 25 m S of the crater rim. The temperature of the crater on 21 July was 74° C, which had not increased much since last measured. On 22 July the Alert Level at Dieng was raised to 2 (on a scale of 1-4). On 24 July at 0730 mud flowed as far as 50 m from the crater towards the N and E. Mud bubbled up to 1 m high in the center of the crater. No heightened seismicity was recorded during either mud-flow event. According to news reports, the crater was closed to tourists.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), The Jakarta Post



Volcano index photo  Gamalama  | Halmahera (Indonesia)  | 0.8°N, 127.33°E  | Elevation 1715 m

VSI raised the Alert Level at Gamalama to 3 (on a scale of 1-4) after an explosion on 31 July around 1430 produced an ash column that rose 0.5-1 km above the volcano and drifted E. Another explosion occurred at 1439 that rose to 1-1.5 km above the volcano, and deposited ash in the town of Ternate ~30 km N of the volcano. The next large explosion occurred at 1625 and ejected incandescent material, produced an ash column that reached 1-2 km above the summit and drifted E, and was accompanied by a pyroclastic flow that traveled ~1 km into the Togorara Valley. VSI raised the Alert Level to 4, the highest level, and some residents near the volcano were evacuated. After an explosion at 1704 produced an ash cloud to 1-1.5 km above the volcano, low-level ash and gas emissions occurred at Gamalama through 1 August.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Associated Press



Ongoing Activity


Volcano index photo  Bezymianny  | Central Kamchatka (Russia)  | 55.972°N, 160.595°E  | Elevation 2882 m

During 27-30 July, no seismicity was recorded at Bezymianny and visual observations were not possible due to meteorological clouds obscuring the volcano. A thermal anomaly was visible on satellite imagery on 28, 29, and 31 July, and 1 August. The Concern Color Code remained at Yellow.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Colima  | Mexico  | 19.514°N, 103.62°W  | Elevation 3850 m

Based on information from the Control Tower at Colima airport, the Washington VAAC reported that an emission from Colima on 3 August at 0739 produced a plume to ~7.6 km a.s.l. On 4 August at 0845 a small ash emission occurred that was visible on satellite imagery. The Mexico City MWO reported that the cloud rose to ~ 6 km a.s.l. and drifted W.

Source: Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Dukono  | Halmahera (Indonesia)  | 1.693°N, 127.894°E  | Elevation 1229 m

During 9-14 July, ash explosions at Dukono produced ash plumes to heights of 800-900 m above the volcano. Ash fell around the towns of Mamuya and Galela. During 15-23 July ash plumes rose to low levels, with a plume reaching ~1 km above the volcano on 22 July. According to the Darwin VAAC, ash was visible on satellite imagery on 31 July and 2 and 3 August, with the highest cloud reaching ~2 km above the volcano.

Sources: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM), Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Etna  | Sicily (Italy)  | 37.748°N, 14.999°E  | Elevation 3320 m

During the end of July, heightened seismicity occurred in the eastern area of Etna. Also, vigorous degassing continued at Northeast crater, and less intense degassing occurred at Bocca Nuova crater. Four small earthquakes with magnitudes up to 2.6 occurred on 30 July between the villages of Milo and Zafferana on the volcano's E flank.

Sources: Italy's Volcanoes, Etna Volcan Sicilien (Charles Rivière)



Volcano index photo  Kilauea  | Hawaiian Islands (USA)  | 19.421°N, 155.287°W  | Elevation 1222 m

During 30 July- 5 August at Kilauea, surface lava flows were visible on the coastal flat and upslope on the Pulama pali and beginning around 3 August at the Holei pali. Surface lava flowed to within 1.1 km of the sea. Generally, seismicity at Kilauea's summit continued at moderate levels, with 1-2 small low-frequency earthquakes per minute occurring at shallow depths beneath the summit caldera. There were some larger events at depths of a few kilometers. Small inflation and deflation occurred during the report week.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Klyuchevskoy  | Central Kamchatka (Russia)  | 56.056°N, 160.642°E  | Elevation 4754 m

Seismicity was above background levels at Kliuchevskoi during 24 July to 1 August. During 24-28 July, 14-17 earthquakes with magnitudes less than 2.1 occurred each day. The number of earthquakes decreased to 9 on 29 July, and 7 on 30 July. Gas-and-steam plumes rose to a maximum height of ~700 m above the crater. Kliuchevskoi remained at Concern Color Code Orange.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



Volcano index photo  Popocatepetl  | Mexico  | 19.023°N, 98.622°W  | Elevation 5393 m

During 30 July-5 August, moderate emissions of mainly gas, steam, and sometimes ash occurred at Popocatépetl.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)



Volcano index photo  Semeru  | Eastern Java (Indonesia)  | 8.108°S, 112.922°E  | Elevation 3657 m

Based on information from an aircraft report, the Darwin VAAC reported that an ash plume emitted from Semeru rose to ~4.5 km a.s.l. on 31 July at 1120. No ash was visible on satellite imagery.

Source: Darwin Volcanic Ash Advisory Centre (VAAC)



Volcano index photo  Soputan  | Sulawesi (Indonesia)  | 1.112°N, 124.737°E  | Elevation 1785 m

Activity decreased at Soputan after an eruption occurred on 18 July. During 21-25 July, incandescent lava on the volcano's W slope gradually cooled and on 22 July volcanic tremor stopped. Ash explosions sporadically occurred, but their density and maximum height decreased. Small-amplitude tremor was continuously recorded. As of 25 July the Alert Level at Soputan was at 2 (on a scale of 1-4).

Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)



Volcano index photo  Soufriere Hills  | Montserrat  | 16.72°N, 62.18°W  | Elevation 915 m

As of 1 August, ash emissions were continuing from Soufrière Hills. Low-level ash clouds were visible on satellite imagery.

Source: Washington Volcanic Ash Advisory Center (VAAC)



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Agung Concepcion Ijen Llaima Peuet Sague Spurr
Ahyi Copahue Iliamna Loihi Pinatubo St. Helens
Aira Cotopaxi Iliwerung Lokon-Empung Planchon-Peteroa Stromboli
Akan Cuicocha Inielika Lopevi Poas Sulu Range
Alaid Cumbal Ioto Machin Popocatepetl Sumbing
Alu-Dalafilla Dabbahu Irazu Makian Puyehue-Cordon Caulle Sundoro
Ambae Dempo Iya Makushin Rabaul Suretamatai
Ambang Descabezado Grande Izu-Torishima Maly Semyachik Raikoke Suwanosejima
Ambrym Dieng Volcanic Complex Jackson Segment Manam Ranakah Taal
Anatahan Dukono Kaba Manda Hararo Raoul Island Tair, Jebel at
Antillanca Volcanic Complex Ebeko Kadovar Marapi Rasshua Takawangha
Antuco Ebulobo Kambalny Maroa Raung Talang
Apoyeque Egon Kanaga Martin Redoubt Tambora
Arenal Ekarma Kanlaon Masaya Reventador Tanaga
Asamayama Epi Karangetang Maule, Laguna del Reykjanes Tandikat-Singgalang
Askja Erebus Karkar Mauna Loa Rincon de la Vieja Tangkoko-Duasudara
Asosan Erta Ale Karthala Mayon Rinjani Tangkuban Parahu
Augustine Etna Karymsky McDonald Islands Ritter Island Tara, Batu
Avachinsky Etorofu-Yakeyama [Grozny Group] Kasatochi Melimoyu Rotorua Telica
Awu Eyjafjallajokull Katla Merapi Ruang Tenerife
Axial Seamount Fernandina Kavachi Midagahara Ruapehu Tengger Caldera
Azul, Cerro Fogo Kelimutu Misti, El Ruiz, Nevado del Three Sisters
Azumayama Fonualei Kelut Miyakejima Sabancaya Tinakula
Bagana Fournaise, Piton de la Kerinci Momotombo Sakar Tofua
Balbi Fourpeaked Ketoi Monowai Salak Tokachidake
Bamus Fuego Kharimkotan Montagu Island San Cristobal Tolbachik
Banda Api Fujisan Kick 'em Jenny Moyorodake [Medvezhia] San Miguel Toliman
Bardarbunga Fukutoku-Oka-no-Ba Kikai Mutnovsky San Vicente Tongariro
Barren Island Galeras Kilauea Myojinsho Sangay Tungurahua
Batur Galunggung Kirishimayama Nabro Sangeang Api Turrialba
Bezymianny Gamalama Kizimen Negra, Sierra Santa Ana Ubinas
Bogoslof Gamkonora Klyuchevskoy Negro, Cerro Santa Maria Ulawun
Brava Gaua Kolokol Group Nightingale Island Sarigan Unnamed
Bristol Island Gorely Korovin Nishinoshima Sarychev Peak Unnamed
Bulusan Great Sitkin Koryaksky Nisyros Saunders Veniaminof
Calbuco Grimsvotn Krakatau Novarupta Semeru Villarrica
Callaqui Guagua Pichincha Krummel-Garbuna-Welcker NW Rota-1 Semisopochnoi West Mata
Cameroon Guallatiri Kuchinoerabujima Nyamuragira Seulawah Agam Westdahl
Campi Flegrei del Mar di Sicilia Guntur Kurikomayama Nyiragongo Sheveluch Whakaari/White Island
Cayambe Hachijojima Kusatsu-Shiranesan Okataina Shishaldin Witori
Cereme Hakoneyama Kverkfjoll Okmok Simbo Wolf
Chachadake [Tiatia] Heard Lamington Ontakesan Sinabung Yasur
Chaiten Hekla Lamongan Oraefajokull Sinarka Zaozan [Zaosan]
Chiginagak Hierro Langila Osorno Siple Zavodovski
Chikurachki Hokkaido-Komagatake Lanin Pacaya Sirung Zhupanovsky
Chiles-Cerro Negro Home Reef Lascar Pagan Slamet Zubair Group
Chillan, Nevados de Hood Lateiki Palena Volcanic Group Soputan
Chirinkotan Huaynaputina Lengai, Ol Doinyo Paluweh Sorikmarapi
Chirpoi Hudson, Cerro Leroboleng Panarea Sotara
Cleveland Huila, Nevado del Lewotobi Papandayan Soufriere Hills
Colima Hunga Tonga-Hunga Ha'apai Lewotolo Parker Soufriere St. Vincent
Colo Ibu Little Sitkin Pavlof South Sarigan Seamount
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 Criteria & Disclaimers

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 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.

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 monthly, and 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)