Wed, 31 Oct 2001, 06:00
Beginning on 26 October, seismicity at Soufrière Hills was at low levels until it increased on 1 November. Clear weather conditions allowed observations of the lava dome on 31 October and 1 November. The active lava dome had grown substantially and appeared to switch growth direction from the NE to the E, where a massive, near-vertical headwall had developed.
Wed, 31 Oct 2001, 06:00During 26 October-2 November, a lava dome continued to grow in Shiveluch's active crater. The evening of 29-30 October incandescent avalanches were observed travelling down the W and SW slopes of the lava dome. Gas-and-steam plumes rose ~1.5 km above the dome on 30 and 31 October.
Wed, 31 Oct 2001, 06:00
Volcanic activity remained low at Popocatépetl, with emissions of small clouds of steam, gas, and minor amounts of ash. Episodes of low-amplitude harmonic tremor also occurred. An aerial photograph of the crater was taken on 25 October by the Dirección General de Carreteras Federales, SCT.
Wed, 31 Oct 2001, 06:00During 22-28 October, VSI personnel observed 121 incandescent lava avalanches traveling SW predominately to the upstream portion of the Sat River, and to a lesser extent to the Lamat and Senow rivers. The maximum run-out distance was 2.75 km. On 24 October four minor pyroclastic flows were observed travelling a maximum distance of 2 km to the upstream portions of the Sat and Senowo rivers.
Wed, 31 Oct 2001, 06:00
During 30 October to 5 November lava continued to flow into the sea at the Kamoamoa and E Kupapa`u entries. On 30 October a new entry located directly off the former Kupapa`u Point was observed. Surface lava flowed above and down Pulama pali along the trace of the Kamoamoa lava tube system.
Wed, 31 Oct 2001, 06:00On 29 October at 0029 an explosion from Crater IV, in the southern portion of the main crater, produced a gray cloud that rose 1.5 km above the crater. During 22-28 October white plumes rose 600 m above main crater, and 50-100 m above Crater II. A "red reflection" was observed reaching up to 75 m above the crater.
Wed, 31 Oct 2001, 06:00
An increase in tectonic earthquakes around Iliwerung during 17-26 October led VSI to raise the Alert Level from 1 to 2 (on a scale of 1-4). From 2 to 11 earthquakes were felt per day with Modified Mercalli intensities of I-II. Visual and instrumental monitoring did not show a significant change in volcanic activity.
Wed, 31 Oct 2001, 06:00The Universidad de Colima reported on 4 November that significant deformation had been registered at Colima. Seismicity remained low and there was little visibility at the volcano.
Wed, 31 Oct 2001, 06:00
During 26 October to 2 November seismicity was at background levels, with only weak earthquakes detected (magnitudes less than or equal to 1.2). During 29 October to 1 November, when the volcano was visible, weak-to-powerful gas-and-steam emissions were observed extending to the SE and E. The Concern Color Code was reduced from Yellow to Green.
Read all
Wed, 24 Oct 2001, 06:00During the week, relatively low volcanic activity continued at Tungurahua. Several steam-and-ash emissions occurred. The night of 23 October ash emissions were observed rising 1 km above the volcano's summit.
Read all
Wed, 24 Oct 2001, 06:00
During 19-26 October there was a general reduction in volcanic activity at Soufrière Hills in comparison with the previous week, while seismicity remained at a similar level. The active lava dome continued to grow at a moderate rate, producing rockfalls and small pyroclastic flows in the upper reaches of the Tar River Valley. Cycles of mostly hybrid earthquakes, with a coincident increase in rockfalls, recommenced after weakening for about a week.
Read all
Wed, 24 Oct 2001, 06:00During 19-26 October, a lava dome continued to grow in Shiveluch's active crater. An explosion during 22-23 October produced a steam-and-gas plume visible from the town of Klyuchi, 46 km from the volcano, rising 4-4.2 km a.s.l. Thermal anomalies in the active dome area were visible on satellite imagery.
Read all
Wed, 24 Oct 2001, 06:00
On 25 October at approximately 0600 a steam column was observed rising 1-2.5 km above Popocatépetl's crater, drifting to the NW. Ground observations confirmed that the column did not include ash. The MWO reported to the Washington VAAC that another eruption column the same day at 1040 rose to ~6.7 km.
Read all
Wed, 24 Oct 2001, 06:00During 15-21 October, VSI personnel observed 103 incandescent lava avalanches traveling SW predominately to the upstream portion of the Sat River, and to a lesser extent to the Lamat and Senow rivers. The maximum run-out distance was 2.75 km. Seismic activity was dominated by avalanche earthquakes similar in magnitude and frequency to earthquakes the previous week.
Read all
Wed, 24 Oct 2001, 06:00
Surface lava flows were visible above and on Kilauea's Pulama pali scarp and on the coastal flat. Lava continued to flow through lava tubes, entering the sea at the E Kupapa`u and Kamoamoa entries. By 28 October the rapidly growing lava bench at Kamoamoa was 120 m seaward of the old sea cliff in comparison to 80-100 m the previous week.
Read all
Wed, 24 Oct 2001, 06:00During 15-21 October volcanic activity at Karangetang continued to decrease, as it did the previous week, and the Alert Level was reduced from 3 to 2 (on a scale of 1-4). The number of volcanic earthquakes decreased compared to the previous week and no avalanche, tremor, or explosion earthquakes were recorded. Multiphase earthquakes, associated with lava dome growth, were detected.
Read all
Wed, 24 Oct 2001, 06:00
During 19-26 October several gas-and-steam plumes rose above Avachinsky's crater, with the highest plume reaching 1 km and extending 20 km to the SE on 20 October. Seismic activity continued above background levels; ten earthquakes occurred with magnitudes of 1.3-2.1. The volcano remained at Concern Color Code Yellow.
Read all
Wed, 17 Oct 2001, 06:00For about three weeks seismic and volcanic activity was relatively low at Tungurahua, consisting of long-period earthquakes, fumarolic activity, and no explosive activity.
Read all
Wed, 17 Oct 2001, 06:00
On 11 October at 1400 an eruption began at Suwanose-jima. Volcanic tremor associated with the eruption was detected during 11 October through at least 15 October. Up to eleven explosions were counted. Acoustic microphones recorded four shock waves associated with large explosions.
Read all
Wed, 17 Oct 2001, 06:00On 20 October at 0235 an eruption began at Stromboli. Preliminary reports stated that glowing rocks were observed being ejected from the volcano. A tourist was killed after being struck by ejecta from the eruption.
Read all
Wed, 17 Oct 2001, 06:00
On the morning of 19 October a small phreatic eruption was observed at Idogahama, a beach on the NW coast of Iwo-jima. The Japan Maritime Self Defense Force observed a grayish white-colored plume rising to 200-300 m above the beach surface for 2-3 minutes starting at about 0725. A similar plume was observed for 10 minutes starting at 0806.
Read all
Wed, 17 Oct 2001, 06:00During 12-19 October activity at Soufrière Hills remained at an elevated level, although there was a reduction in seismicity compared with the previous few weeks. The cyclical nature of the seismic activity, which had been a dominant feature over recent months, also weakened. The active lava dome continued to grow at a moderate rate, producing pyroclastic flows on most days into the upper reaches of the Tar River Valley.
Read all
Wed, 17 Oct 2001, 06:00
During 12-19 October, a lava dome continued to grow in Shiveluch's active crater and several gas-and-steam plumes were observed. The highest reported gas-and-steam plume was produced by an explosion on 17 October at 1740; it rose 1.2 km above the dome and extended 3 km to the W. Thermal anomalies in the active dome area were visible on satellite imagery.
Read all
Wed, 17 Oct 2001, 06:00During the week, Popocatépetl emitted small clouds of steam, gas, and minor amounts of ash. In addition, seismometers recorded episodes of harmonic tremor.
Read all
Wed, 17 Oct 2001, 06:00
During 8-14 October, VSI personnel observed 53 incandescent lava avalanches traveling SW predominately to the upstream portion of the Sat River, and to a lesser extent to the Lamat and Senow rivers to a maximum run-out distance of ~2 km. On 8 October at 1729 a minor pyroclastic flow traveled ~2 km down the Sat River. Seismicity was dominated by 692 lava avalanche events.
Read all
Wed, 17 Oct 2001, 06:00During the week, surface lava flows were visible on Kilauea's Pulama pali scarp and lava continued to enter the ocean at the E Kupapa`u and Kamoamoa entries. On 21 October the lava bench at the Kamoamoa entry extended approximately 80-100 m seaward from the old sea cliff. Generally, volcanic tremor remained at low-to-moderate levels at Kilauea's summit and Pu`u `O`o.
Read all
Wed, 17 Oct 2001, 06:00
During 8-14 October the number of deep volcanic earthquakes at Karangetang decreased compared to the previous week and no incandescent lava avalanches occurred. Steam plumes rose 400 m above the main crater and 50-100 m above Crater II. A 25-m-high "red reflection" was observed.
Read all
Wed, 17 Oct 2001, 06:00As of 16 October moderate amounts of degassing took place at Etna's summit craters, with most occurring at Northeast Crater. A portion of the western crater rim of the scoria cone that formed during the July-August 2000 eruption at 2,100 m elevation collapsed into the vent.
Read all
