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Tuesday, Feb 27, 2007
Lava flow at Stromboli volcano (archive photo)
Lava flow at Stromboli volcano (archive photo)

Stromboli volcano erupted today with a new lava flow.(27 Feb. 2006), as we had forecasted in July.

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Monday, Feb 26, 2007

Seismic activity and strombolian activity at Tungurahua has been increasing since the evening of 23 February, 2007. Ash fall has been reported in the villages of Pillate, San Juan, Cotalo and Bilbao. On the evening of 25 Feb. an airline pilot reported observing an ash plume at 6.3 km altitude.

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Sunday, Feb 25, 2007

Based on pilot reports, the Buenos Aires VAAC reported continuous emissions from Ubinas during 18-20 February. Ash plumes rose to 5.5-7 km (18,000-23,000 ft) a.s.l. and drifted E and SW.

Based on information from JMA and satellite imagery, the Tokyo VAAC reported that an explosion from Suwanose-jima produced eruption plumes during 19-20 February. The altitude and direction of the plumes were not reported.

Data from deformation-monitoring instruments showed that during 14-20 February the lava dome at Mount St. Helens continued to grow. Seismicity continued at low levels, punctuated by M 1.5-2.5 and occasionally larger earthquakes. Inclement weather inhibited observations.

During 9-16 February, seismic activity at Soufrière Hills was slightly elevated as compared to previous weeks. The lava-dome volume was estimated at 200 million cubic meters based on recent measurements from LIDAR data. Previous measurements over-estimated the lava-dome volume due to the perceived location of the dome and the lack of data from inside the crater. The height of the dome was about 1060 m a.s.l. During 17-18 February, rockfalls and small pyroclastic flows traveled W down Gages Valley and E down Tar River Valley. Incandescence was seen from the E and N sides of the dome. Rockfalls continued on 19 and 20 February.

Activity at Shiveluch continued above background levels during 9-16 February, with over 180 volcanic earthquakes and tremor occurring daily. Based on seismic interpretation, observation, and video data, gas-and-ash plumes rose to altitudes of 5.5-6 km (18,000-19,700 ft) a.s.l. throughout the reporting period. Plumes drifted W and SW. A large thermal anomaly was visible on satellite imagery. The Tokyo VAAC reported eruption plumes to altitudes of 5.2-6.1 km (17,000-20,000 ft) a.s.l. on 15 and 19 February based on information from KEMSD, KVERT, and satellite imagery. Plumes drifted NW on 19 February. The Level of Concern Color Code remained at Orange

Based on satellite imagery, the Washington VAAC reported that diffuse plumes from Santa María's Santiaguito lava dome complex drifted NE on 15 February. INSIVUMEH reported that avalanches descended the SW flank to the base of Caliente Dome and explosions produced diffuse ash plumes that drifted SW on 15 February. Explosions on 19 February produced ash plumes and ashfall to areas SW. According to the Washington VAAC diffuse plumes were visible on satellite imagery.

Based on satellite imagery and pilot reports, the Tokyo VAAC reported that an ash plume from Sakura-jima reached an altitude of 1.5 km (5,000 ft) a.s.l. on 15 February.

Based on satellite imagery and RVO, the Darwin VAAC reported that diffuse plumes from Rabaul rose to altitudes of 2.1 km (7,000 ft) a.s.l. and drifted ESE.

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