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.
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.
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.
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.
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.
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.
Based on information from the IG, the Washington VAAC reported that on 22 June at 0630 and 0652 eruptions sent ash clouds to 5.8 and 8.8 km a.s.l., respectively. No ash was visible on satellite imagery. Small explosions on 25 June at 0138 and 1328 produced ash clouds that rose ~6 km a.s.l and drifted to the W.
A large, pyroclastic-flow producing eruption began at Mayon on 24 June at 1245. The first signs of heightened volcanic activity occurred on 19 June when tremor began that was associated with increased lava extrusion. SO2 emission increased to 6,000 metric tons on 19 June in comparison to an average of 1,700 metric tons per day the previous week.
Wed, 20 Jun 2001, 06:00
According to information from pilot reports, Rabaul Volcanological Observatory (RVO), NOAA, and GMS imagery, the Darwin VAAC reported that on 25 June Manam produced multiple lava flows and an ash cloud that rose to a maximum height of 4.5 km a.s.l. The ash cloud was not visible on satellite imagery. RVO noted that occasional low-level ash emissions had been observed since 20 June.
Read allWed, 20 Jun 2001, 06:00
During 15-22 June volcanic activity remained at about the same level as the previous week. The number of rockfalls increased in comparison to the previous week, while other types of seismic events generally decreased. Towards the end of the week the number of rockfalls also decreased slightly.
Read allWed, 20 Jun 2001, 06:00
During 15-21 June seismic activity was above background levels. Many small earthquakes occurred within the volcano's edifice and episodes of weak spasmodic volcanic tremor were recorded. Local seismic signals accompanied explosions, avalanches, and collapses.
Read allWed, 20 Jun 2001, 06:00
According to news reports, on 21 June an explosion at San Cristóbal sent an ash cloud to a maximum height of 800 m. The cloud extended approximately 25 km downwind of the crater and ash fell in the town of Chinandega, ~15 km SW of the volcano.
Read allWed, 20 Jun 2001, 06:00
Volcanic activity at Popocatépetl remained at normal levels, with several small exhalations of steam, gas, and small amounts of ash. Based on information from CENAPRED, the Washington VAAC reported that on 24 June at 0900 a small eruption produced an ash cloud that rose ~0.5 km above the volcano and drifted to the SW.
Read allWed, 20 Jun 2001, 06:00
Tremor associated with the eruption that began on 11 June at Piton de la Fournaise continued under the volcano's E flank. Lava fountains were visible at two vents; at one vent strong degassing occurred, while at the other vent a boiling lava lake occasionally overflowed, sending lava flows towards the NE.
Read allWed, 20 Jun 2001, 06:00
Weak glow was visible in the area where lava entered the sea at the E Kupapa`u entry. Small lava flows were active on the coastal flat at the base of the Pulama pali scarp. Generally, weak, steady tremor and related long-period earthquakes continued beneath Kilauea's caldera.
Read allWed, 20 Jun 2001, 06:00
During the week two eruptive episodes occurred at Etna's Southeast Crater. On 22 June an eruption began after 3 days of low activity. The eruption was similar to the previous episodes, with lava flowing down the flanks of the volcano prior to Strombolian activity.
Read allWed, 13 Jun 2001, 06:00
Several small eruptions produced ash clouds that rose to a maximum height of ~9.7 km. The IG reported that the number of long-period earthquakes and the emission of gas and ash had increased since the end of April. They warned that heavy rain could remobilize ash on the flanks of the volcano, generating dangerous lahars.
Read allWed, 13 Jun 2001, 06:00
Tremor associated with an eruption that began on 11 June had weakened by 16 June. The same day a fissure located on the E flank at the S base of crater Signal de l'Enclos at 1,800 m altitude was intensely active. In an area near the active fissure a cone began to form and lava fountains rose up to 30 m above the surface.
Read allWed, 13 Jun 2001, 06:00
Based on a pilot report, the Wellington VAAC issued an ash advisory stating that at 0302 on 14 June a small eruption produced an ash cloud that rose up to ~1.8 km a.s.l. The cloud expanded towards the N over the islands of Paama and Ambrym.
Read allWed, 13 Jun 2001, 06:00
From 12 June to at least 15 June volcanic activity increased at Soufrière Hills in comparison to the previous week. There was a larger number of rockfalls, and hybrid and long-period earthquakes. Sulfur dioxide flux markedly increased (770 metric tons on 11 June and 1410 metric tons on 14 June).
Read allWed, 13 Jun 2001, 06:00
During 8-14 June seismic activity was above background level at Shiveluch. Many small earthquakes occurred within the volcano's edifice and local seismic signals accompanied explosions, avalanches, and collapses. There were several ash-and-gas eruptions, with the highest eruption cloud reaching up to 2 km above the lava dome.
Read allWed, 13 Jun 2001, 06:00
Volcanic activity at Popocatépetl remained at normal levels, with several small exhalations of steam, gas, and small amounts of ash. The volcano remained at Alert Level Yellow Phase III, with a restricted 12-km-radius area.
Read allWed, 13 Jun 2001, 06:00
A high level of high-frequency low-duration harmonic tremor was detected on Mayon that was associated with near-continuous detachment of hot rock fragments from the summit lava dome. In addition, moderate amounts of steam emanated from the crater, crater glow was fair-to-bright, and SO2 emission (average of ~2,700 metric tons per day) was well above the baseline value of 500 metric tons per day. Alert Level 3 remained in effect, prohibiting entry within the 6-km-radius permanent danger zone.
Read allWed, 13 Jun 2001, 06:00
Small surface pahoehoe lava flows were visible on the W end of the flow field. Lava entered the sea at the E Kupapa`u ocean entry. Generally, weak, steady tremor and related long-period earthquakes continued beneath Kilauea's caldera.
Read allWed, 13 Jun 2001, 06:00
The Italy's Volcanoes website reported that on 13 June, after ~44 hours of low activity, the fourth eruptive episode within in a week began at Southeast Crater. The episode lasted longer and was more intense than the previous three episodes. Lava flowed from a vent on the NNE flank of Southeast Crater cone.
Read allWed, 6 Jun 2001, 06:00
A SIGMET from the Guayaquil MWO noted that the IG reported ash to 7 km a.s.l. moving W on 5 June at 1200. Considerable cloudiness over and around the summit made it difficult to detect any ash in satellite imagery.
Read allWed, 6 Jun 2001, 06:00
Continuous extensometer and inclinometer variations have occurred since the beginning of April, and increased seismic activity has been recorded since the end of May. A short seismic crisis with 126 recorded events started at Piton de la Fournaise on 11 June 2001 at 1327. At 1350 extensometer variations indicated that a new eruption had started on the ESE flank, in the same area as the previous eruption on 27 March 2001.
Read allWed, 6 Jun 2001, 06:00
According to the Wellington VAAC an eruption at Lopevi that began on 8 June at 1250 produced an ash cloud that rose at least 6 km a.s.l. and drifted to the WNW. The ash cloud was clearly visible on enhanced satellite imagery for many hours.
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