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Smithsonian / USGS Weekly Volcanic Activity Report

Weekly Volcanic Activity Map

You are currently viewing Archived reports for the week of 26 June-2 July 2002.


















 Activity for the week of 26 June-2 July 2002

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
Hood United States New

Karangetang Siau Island (Indonesia) Ongoing
Karymsky Eastern Kamchatka (Russia) Ongoing
Kilauea Hawaiian Islands (USA) Ongoing
Merapi Central Java (Indonesia) Ongoing
Popocatepetl Mexico Ongoing
Semeru Eastern Java (Indonesia) Ongoing
Sheveluch Central Kamchatka (Russia) Ongoing
Soufriere Hills Montserrat Ongoing
Tungurahua Ecuador Ongoing


New Activity / Unrest


Volcano index photo  Hood  | United States  | 45.374°N, 121.695°W  | Elevation 3426 m

CVO reported that the strongest earthquake in the Mount Hood area in decades occurred on 29 June at 0736. The widely felt M 4.5 event was located ~4.5 km S of the summit at a depth of 6 km. Hundreds of aftershocks followed, including two greater than M 3. Typically, several earthquake swarms occur each year at Mount Hood.

Sources: US Geological Survey Cascades Volcano Observatory (CVO), Associated Press



Ongoing Activity


Volcano index photo  Karangetang  | Siau Island (Indonesia)  | 2.781°N, 125.407°E  | Elevation 1797 m

During 17-23 June, there was a significant increase in the number of shallow and deep volcanic earthquakes at Karangetang in comparison to the previous week. In addition, low-level plumes rose above the main crater and crater II. A red reflection was visible 25 m above the rim of crater II. Karangetang remained at Alert Level 2 (on a scale of 1-4).

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



Volcano index photo  Karymsky  | Eastern Kamchatka (Russia)  | 54.049°N, 159.443°E  | Elevation 1513 m

During 21-28 June, seismicity was above background levels at Karymsky, with ~10 earthquakes occurring per hour. The character of seismicity suggested that weak ash-and-gas explosions and gas blow-outs had probably occurred. A steam-and-gas plume was visible on AVHRR satellite imagery on 25 June. Thermal anomalies were visible on satellite imagery, but ash was not. Karymsky remained at Concern Color Code Yellow ("volcano is restless").

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

During 25-30 June, surface lava flows were visible on Kilauea's SW flank. Mild deflation, totaling 0.9 microradians, occurred at Pu`u `O`o on 26 June around 2130. No other significant deformation was recorded during the report period. Seismicity was at normal levels, except for the continued swarm of long-period earthquakes and tremor that has been occurring below Kilauea's caldera since early June.

Source: US Geological Survey Hawaiian Volcano Observatory (HVO)



Volcano index photo  Merapi  | Central Java (Indonesia)  | 7.54°S, 110.446°E  | Elevation 2910 m

During 17-23 June, observers noted 65 incandescent lava avalanches flowing predominately down Merapi's SW flank into the upstream portions of the Sat, Lamat, and Senowo rivers. The avalanches reached a maximum run-out distance of ~2.5 km. Seismicity decreased in comparison to the previous week. Merapi remained at Alert Level 2 (on a scale of 1-4).

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



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

During 26 June-1 July, there were small-to-moderate emissions of steam, gas, and ash at Popocatépetl. In addition, several episodes of low-amplitude harmonic tremor were recorded. The most notable emissions, on 26 June at 1110 and on 1 July at 0238, produced ash clouds to a height of ~2 km above the volcano.

Source: Centro Nacional de Prevencion de Desastres (CENAPRED)



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

During 17-23 June, seismic and volcanic activity were higher than normal at Semeru. Lava avalanches were observed traveling 750 m E to the Besuk Kembar River. Seismicity included 670 explosion events. Semeru remained at Alert Level 2 (on a scale of 1-4).

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



Volcano index photo  Sheveluch  | Central Kamchatka (Russia)  | 56.653°N, 161.36°E  | Elevation 3283 m

Seismicity declined at Shiveluch during 21-28 June, but remained above background levels. It included earthquakes with magnitudes less than or equal to 1.9 at depths of 0-6 km, many local shallow seismic signals (from possible avalanches or weak gas-and-ash explosions), and episodes of weak intermittent volcanic tremor. Gas-and-steam plumes reached to 3 km above the lava dome and small avalanches were captured on video rolling down the dome on 23 June. Thermal anomalies were visible on AVHRR satellite imagery, but ash was not. The Concern Color Code remained at Yellow ("volcano is restless").

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)



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

Volcanic and seismic activity were at low levels during 21-28 June at Soufrière Hills. Growth of the extruded lobe on the SE side of the lava dome appeared to have stagnated. The number of rockfalls decreased abruptly on the afternoon of 22 June, remained at low levels for the rest of the week, and declined to very low levels during the last 3 days of the report period. SO2 emission rates also decreased to very low levels by the end of the report period.

Sources: Montserrat Volcano Observatory (MVO), Washington Volcanic Ash Advisory Center (VAAC)



Volcano index photo  Tungurahua  | Ecuador  | 1.467°S, 78.442°W  | Elevation 5023 m

During 26 June-2 July, volcanism at Tungurahua consisted of small emissions of gas, steam, and ash. For several days, frequent explosions emitted rocks and incandescent material that traveled down the volcano's flanks. IG reported that an explosion on 1 July at 1123 produced an ash cloud that rose 1.5 km above the summit and drifted to the W.

Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), 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.

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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)