During 12-27 May, Ulawun's main summit crater continued to emit weak-to-moderate volumes of white vapor and the N valley vent was quiet with no emissions observed. A slight increase in seismicity occurred during 18-23 May. According to the Darwin VAAC, on 1 June at 0925 a thin, low-level plume was observed on satellite imagery.
Volcanic activity at Soufrière Hills decreased slightly during 23-30 May. Most activity was focused on the lava dome's ENE flank, producing rockfalls and numerous pyroclastic flows along the N side of the Tar River Valley and occasionally in White's and Tuitt's ghauts. Rockfalls and small pyroclastic flows also spilled off the lava dome's northern flanks onto Farrell's Plain.
Plumes emitted from Semeru were visible on satellite imagery at a height of ~6 km a.s.l. on 29 May at 0838 drifting NW, and on 2 June at 0625 drifting SSE.
Occasional emissions of thin white-gray ash plumes occurred from Manam's Main Crater during 13-27 May. Ashfall was seen on the NW side of the island during 17-19 and 23 May. There were no precursors to this activity; no noises were heard and no incandescence was seen.
Volcanic unrest continued at Kliuchevskoi during 23-30 May. Seismicity was above background levels and the amount of continuous spasmodic volcanic tremor slightly increased. Shallow earthquakes and others at depths around 30 km continued to occur.
During 27 May to 2 June, lava continued to flow down Kilauea's SE flank, with surface lava flows occasionally visible on the coastal flat and upslope at Pulama pali, and Paliuli. Small amounts of lava continued to flow into the sea at Highcastle beach. A fire started by lava flows the previous week continued to burn W of the flow field.
Satellite imagery showed a low-level plume extending NE from Karangetang on 30 May at 0646.
Based on information from the México City MWO, the Washington VAAC reported an emission from Colima on 27 May at 2014. The resultant plume rose to ~6 km a.s.l. No ash was visible on satellite imagery.
Wed, 28 May 2003, 06:00
The eruption that began at Chikurachki on 18 April continued during 23-28 May. Ash from an eruption began to fall on the Shelekhov settlement on 27 May at 1800. Ash plumes rose ~1 km above the volcano and drifted NE.
Read allWed, 28 May 2003, 06:00
Emissions of ash and gas at Anatahan, which began on 10 May, continued during 28 May to 3 June. During most of the report week, eruption clouds rose to heights around 3 km a.s.l. Based on a report from an aircraft, the Washington VAAC stated that ash from a fairly vigorous eruption on 31 May around 1025 rose to ~7.6 km a.s.l.
Read allWed, 21 May 2003, 06:00
Volcanic activity at Soufrière Hills was generally at high levels during 16-23 May, although there was a slight decrease in intensity on 19 and 20 May. Most activity was focused on the lava dome's NE flank, producing rockfalls and numerous pyroclastic flows along the northern side of Tar River Valley. During the last 3 days of the report period, activity increased on the N flank, with pyroclastic flows traveling into the top of Farrell's Plain and entering the top of Tyre's and Tuitt's ghauts.
Read allWed, 21 May 2003, 06:00
Volcanic activity that began at Anatahan on 10 May continued during 21-27 May. On 21 May an ash plume was visible on satellite imagery at a height of about 4.9 km a.s.l. drifting W.
Read allWed, 21 May 2003, 06:00
Seismicity continued to be above background levels at Shiveluch during 16-23 May. Weak, shallow earthquakes were recorded and seismic data indicated that an ash-and-gas explosion reached a height of about 4 km above the lava dome. Incandescent lava avalanches may have occurred on 17 May.
Read allWed, 21 May 2003, 06:00
Volcanic and seismic activity at Semeru continued at relatively high levels during 12-18 May. Several small ash explosions rose to low levels above the summit. Seismicity was dominated by 730 explosion events. Semeru remained at Alert Level 2 (on a scale of 1-4).
Read allWed, 21 May 2003, 06:00
Volcanic unrest continued at Kliuchevskoi during 16-23 May. Seismicity was above background levels, with five M 2-2.1 earthquakes occurring at depths around 30 km during 15-21 May. Continuous spasmodic volcanic tremor occurred during the report period.
Read allWed, 21 May 2003, 06:00
During 21-26 May, surface lava flows were visible on Kilauea's coastal flat and the Pulama Pali fault scarp. Small amounts of lava began to flow into the sea on 21 May. Generally, seismicity was at normal levels, with little or no volcanic tremor occurring at Kilauea's summit.
Read allWed, 21 May 2003, 06:00
Intermittent explosions occurred at Karymsky during 16-23 May. Seismicity was above background levels, with 150 to 320 shallow events occurring per day during 18-21 May. Seismic data indicated that ash-and-gas explosions reached heights up to 1 km above the crater, and gas blowouts and hot avalanches possibly occurred.
Read allWed, 21 May 2003, 06:00
A reduction in volcanic activity at Karangetang during 12-18 May led VSI to reduce the Alert Level from 3 to 2. Activity during the week consisted of low-level ash clouds rising above Karangetang's South crater, incandescence extending 25 m above the crater, and incandescent avalanches traveling toward Kali Batang to runout distances of 750-1,000 m. In addition, there was a decrease in the number of multiphase earthquakes compared to the previous week.
Read allWed, 21 May 2003, 06:00
The eruption that began at Chikurachki on 18 April continued during 16-23 May. On 17 and 18 May ash-rich plumes were visible on satellite imagery drifting SW and NE, respectively. Chikurachki remained at Concern Color Code Orange.
Read allWed, 14 May 2003, 06:00
Activity at Soufrière Hills remained high during 9-16 May. The direction of lava-dome growth switched to the NE during the report period. Rockfalls and pyroclastic flows traveled NE along the N side of the Tar River Valley and occasionally occurred in White's Ghaut.
Read allWed, 14 May 2003, 06:00
Several explosions occurred at Kliuchevskoi during 9-16 May, and seismicity was above background levels. On 14 May KVERT raised the Concern Color Code to Orange from Yellow. An eruption on 14 May at 1120 produced the week's highest rising ash cloud (~8.5 km a.s.l.).
Read allWed, 14 May 2003, 06:00
The eruption at Anatahan that began on 10 May continued through 20 May with less intensity than when it began. The Washington VAAC reported that the ash cloud produced by the eruption drifted W and NW and was at a height of ~5 km a.s.l. on 14 May, and ~4 km a.s.l. on 15 May.
Read allWed, 14 May 2003, 06:00
During 9-16 May at Shiveluch seismicity was above background levels, and several small explosions occurred. Weak shallow earthquakes were recorded, and seismic data suggested that 6 ash-and-gas explosions reached heights of 1.5 km above the lava dome and hot avalanches possibly occurred. On 11 May seismic data indicated that two ash-and-gas explosions rose to 6 km a.s.l. and were possibly accompanied by hot avalanches.
Read allWed, 14 May 2003, 06:00
On 14 May at 1813 a small and brief explosion at Mayon's summit crater produced a small NW-drifting ash puff that rose less than 100 m above the crater. Two seismic stations recorded this as a small-amplitude event. PHIVOLCS stated that there had been a succession of minor emissions in the past few months and that ongoing unrest may lead to more vigorous activity.
Read allWed, 14 May 2003, 06:00
HVO reported on 18 May that inflation may have resumed at Mauna Loa's summit during the week, after slackening off following an increase in mid-February. Seismicity, however, remained low. Inflation was noted where the GPS network first showed definite lengthening of the lines across the summit caldera in late April or May 2002, after nearly 10 years of slight deflation.
Read allWed, 14 May 2003, 06:00
During 14-19 May, lava flows continued to travel down Kilauea's S flank. Surface lava flows were visible on the coastal flat and the Pulama Pali fault scarp. Lava trickled into the sea at the West Highcastle entry on the 14th and then ceased thereafter.
Read allWed, 14 May 2003, 06:00
Intermittent explosive activity continued at Karymsky during 9-16 May. Seismicity was above background levels on 10-16 May. Seismic data indicated that a total of 10 ash-and-gas explosions reached heights up to 1 km above the crater, and hot avalanches possibly occurred.
Read allWed, 14 May 2003, 06:00
According to the Universidad de Colima, lava flows have not been seen at Colima since early March, contrary to reports of lava flows visible on 6 May. As of about 18 May activity at Colima consisted of about 25 small explosions per day, with some containing ash. Ash dispersal was limited to ~7 km from the summit.
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