Volcanos

Roundup of Global Volcanic Activity:

Kizimen (Kamchatka): KVERT reports continuing growth of the lava dome, accompanied by hot avalanches and strong degassing.

Tolbachik (Kamchatka): Activity has remained stable during the past week. Lava continues to be erupted from the fissure vent on the south side of Tolbachik Dol, feeding two flow fields to the west and south.

Rabaul (Tavurvur) (New Britain, Papua New Guinea): Weak to moderate eruptive activity continues, characterized by frequent explosions and ash emissions from the Tavurvur cone: RVO reported that during 22-31 July low-level activity consisted of discrete emissions of pale gray ash plumes occurring at short intervals. Some emissions were explosive and generated plumes that rose 2 km above the crater. Plumes drifted E, NE, N, NW, W, and SW, and deposited minor amounts of fine white and gray ash in areas downwind mainly between Namanula and Malaguna No. 1 (with Rabaul Town, 3-5 km NW, in between), and to a lesser extent between the Vulcan area and Malaguna No. 2. Roaring and rumbling noises also continued, often in conjunction with explosions.

Manam (Papua New Guinea): RVO reported that activity at Manam's Southern and Main craters remained low during 22-31 July; observers noted white vapour plumes rising from the craters during periods of clear weather. Considerable amounts of blue vapour rose from Southern Crater during 25-26 July. Deep and low booming noises were heard on the island on most days since 24 July, however, on 30 July a loud explosion was heard in Bogia, 25-30 km SSW of Manam on the N coast of the mainland. Seismicity fluctuated but remained high.

Veniaminof (Alaska Peninsula, USA): Seismic activity remains above background levels and is characterized by intermittent bursts of tremor. Clouds obscured observations of the volcano in satellite and web camera images, so it is unclear whether low-level eruptive activity is continuing. (AVO)