Activity for the week of 27 June-3 July 2001
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.
New Activity / Unrest
| Papua New Guinea
| 4.08°S, 145.037°E
| Elevation 1807 m
The Rabaul Volcano Observatory reported that there have been no recent lava flows from Manam, contrary to pilot reports of multiple lava flows on 25 June. There were signs of recent volcanic activity on 14 June, when emissions produced fine ash, and on 21 June, when roaring/rumbling noises emanated from the volcano. Small light gray ash emissions had been occasionally observed on other occasions.
Source: Rabaul Volcano Observatory (RVO)
| Luzon (Philippines)
| 13.257°N, 123.685°E
| Elevation 2462 m
After the large eruption on 24 June volcanic activity returned to relatively low levels for several days. During this period, rockfalls dominated the seismic records as lava slowly flowed to the SE down the Bonga Gully. PHIVOLCS reported that due to diminished lava extrusion lava was not expected to reach populated areas. Volcanic activity increased on 29 June when explosions occurred at 1605 and 1702. These explosions generated pyroclastic flows that traveled down the Bonga Gully and generated billowing ash clouds that ascended to ~4 km above the volcano. The pyroclastic flows reached ~3 km to the SE of the summit towards the general direction of Matanag Gully. During the eruption a portion of the Upper Basud Gully in the volcano's eastern sector collapsed. On 1 July, SO2 emission rates were as high as 8,700 metric tons per day, a value about 5-fold higher than on 29 June. By 2 June the rate of SO2 emission greatly decreased to 840 tons per day. PHIVOLCS stated that due to the ongoing significant inflation of the volcanic cone and anomalous rapid decline of SO2 emission rates a high likelihood of continued explosive eruptions in the coming days remains. Accordingly, the hazard status remained in the top category, Alert Level 5 (hazardous eruption in progress).
Sources: Philippine Institute of Volcanology and Seismology (PHIVOLCS), Associated Press, Reuters
| Central Kamchatka (Russia)
| 56.653°N, 161.36°E
| Elevation 3283 m
Increases in both seismic activity and explosions at Shiveluch led KVERT to raise the Concern Color Code on 2 July from Yellow to Orange. On 26 June, prior to an increase in seismic activity, a possible thermal anomaly was observed on satellite imagery. The volcanic activity increase may have begun on 28 June at 1500 when the level of volcanic tremor and the number of shallow earthquakes increased. According to reports from observers in the town of Klyuchi (46 km from the volcano) on 29 June at 1150 a short-lived explosion sent an ash-and-gas plume to a height of ~4.5 m a.s.l. During the eruption pyroclastic flows traveled 2.5 to 3 km down the slopes of the volcano. Later in the day and during the next day seismic data suggested that six possible gas-and-ash explosions occurred that produced ash to a maximum height of 8.5 km a.s.l. According to the Tokyo VAAC the largest 30 June explosion began at 0300 and produced an ash plume that ascended to 7.3 km a.s.l. Later during 30 June and 1 July, GOES and other satellite's imagery showed a possible ash cloud drifting over the Bering Sea that may have originated in Kamchatka. According to visual observations from the town of Klyuchi, on 1 July explosions produced ash plumes that rose to 1.5 km above the dome, and at 1250 a short-lived explosion produced an ash-and-gas plume that rose to ~8 km a.s.l and drifted to the E. Pyroclastic flows extended 5 km down the Baidarnaya River.
Sources: Kamchatkan Volcanic Eruption Response Team (KVERT), Tokyo Volcanic Ash Advisory Center (VAAC), Pravda News
| Sicily (Italy)
| 37.748°N, 14.999°E
| Elevation 3295 m
An eruptive episode began on the evening of 27 June at the NNE vent on Southeast Crater. The episode began with lava flowing from the NNE vent and was followed by Strombolian activity at the NNE vent and the summit. Volcanic material was ejected to a maximum height of 400 m. No sustained lava fountains developed. The Toulouse VAAC reported that Sistema Poseidon's Etna webcam recorded renewed volcanic activity on 28 June at 0030 and associated steam and ash that did not rise far above the summit. The eleventh eruptive episode in one month began on 30 June. Inclement weather inhibited visual observations, but during a break in cloud cover around 0400 mild Strombolian activity was observed. Seismic data revealed that the episode ended around 1600. On 3 July increased degassing was observed at Northeast Crater.
Sources: Italy's Volcanoes, Sezione di Catania - Osservatorio Etneo (INGV), Toulouse Volcanic Ash Advisory Centre (VAAC)
| Hawaiian Islands (USA)
| 19.421°N, 155.287°W
| Elevation 1222 m
Small surface flows of pahoehoe lava were visible on the coastal flat below Pulama pali, clustered near the E edge of the flow field and to the W. Lava poured into the sea at two main sites along the eastern third of the E Kupapa`u bench. On 26 June from about noon until the evening, less than 1 microradian of deflation occurred at the summit, and about 0.5 microradian of deflation occurred at Pu`u `O`o. Generally, weak, steady tremor and related long-period earthquakes continued beneath Kilauea's caldera. Earthquake activity remained slightly above average at the summit. Tremor remained weak to moderate near Pu`u `O`o and seismicity was at normal levels elsewhere. Tiltmeters in the summit area and along the east rift zone indicated no significant deformation.
Source: US Geological Survey Hawaiian Volcano Observatory (HVO)
Piton de la Fournaise
| Reunion Island (France)
| 21.244°S, 55.708°E
| Elevation 2632 m
Since 22 June constant tremor occurred that was associated with the eruption that began on 11 June. On 1 July an increase in tremor that occurred for about one hour was accompanied by strong degassing at a cone and a large amount lava emission. On 29 June new lava flows were observed in the Grand Brûlé area travelling to the N. By 2 July several dozen small flows were visible.
Source: Observatoire Volcanologique du Piton de la Fournaise (OVPF)
| 19.023°N, 98.622°W
| Elevation 5393 m
Volcanic activity at Popocatépetl remained at normal levels, with several small exhalations of steam, gas, and small amounts of ash. Based on information from the Mexico City MWO, the Washington VAAC stated that on 1 July at 0915 a small eruption produced an ash plume that rose to less than 1 km above the volcano and drifted to the SSW. On 3 July at 0425 a moderate-sized exhalation produced an ash cloud seen on satellite imagery to spread in two directions; to less than 1 km above the volcano drifting to the NW, and ~4 km above the volcano drifting to the SE.
Sources: Centro Nacional de Prevencion de Desastres (CENAPRED), Washington Volcanic Ash Advisory Center (VAAC)
| 1.467°S, 78.442°W
| Elevation 5023 m
According to reports from IG, about one small explosion per day has occurred at Tungurahua since the explosion on 17 June produced an ash cloud that rose to 7 km above the summit. The explosions have usually occurred with no warning, and light ash fall has frequently fallen to the W of the volcano, often damaging crops. The Washington VAAC reported that during the week the IG stated that seismic activity on 28 June at 1824 suggested that an eruption may have produced an ash cloud that rose to 7 km a.s.l. The ash cloud was not visible in satellite imagery. On 3 July at 0715 the Washington VAAC issued a report that a pilot observed W-drifting ash over the volcano between 5.8 and 7.6 km a.s.l.
Sources: Instituto Geofísico-Escuela Politécnica Nacional (IG), Washington Volcanic Ash Advisory Center (VAAC)
Weekly Reports Archive
|Antillanca Volcanic Complex
||Huila, Nevado del
||Hunga Tonga-Hunga Ha'apai
||Soufriere St. Vincent
||South Sarigan Seamount
||Tair, Jebel at
|Campi Flegrei del Mar di Sicilia
|Chillan, Nevados de
||Kick 'em Jenny
|Dieng Volcanic Complex
||Rincon de la Vieja
|Etorofu-Yakeyama [Grozny Group]
||Ruiz, Nevado del
||Lengai, Ol Doinyo
|Fournaise, Piton de la
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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:
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