Global Volcanic Activity – New Activity for the week of 3 July – 9 July 2019

Manam | Papua New Guinea : According to the United Nations in Papua New Guinea an estimated 1,410 people from seven villages remained affected from the 27 June eruption of Manam; as many as 455 homes and many gardens had been destroyed. The Darwin VAAC reported that on 6 July ash plumes rose to 5.5-6.1 km (18,000-20,000 ft) a.s.l. and drifted W and NW.

Semisopochnoi | United States : An increase in seismicity above background levels on 4 July at Semisopochnoi prompted AVO to raise the Aviation colour Code to Orange (the second highest level on a four-colour scale) and the Volcano Alert Level to Watch (the second highest level on a four-level scale). Elevated seismicity continued through at least 9 July. No eruptive activity was detected in regional infrasound data, and cloudy conditions obscured satellite views of the volcano.

Stromboli | Aeolian Islands (Italy) : An intense paroxysmal explosive sequence at Stromboli on 3 July resulted in injuries to tourists climbing the volcano and one death. INGV surveillance cameras recorded intensification of Strombolian activity at the N1 and N2 vents in Area N (north crater area, NCA) and vent S2 in Area C-S (South Central crater area), and spattering at S1 and C in Area C-S. An explosion from Area C-S at 1459 was followed by lava effusion and a flow that traveled into the upper part of Sciara del Fuoco. At different times during 1543-1545 lava overflowed from all vents and a strong explosion occurred at N1 at 1545. The paroxysmal phase began at 1546; two lateral blasts presumably from Area C-S were recorded at 1546:10 and 1546:20, just 10 seconds apart from each other. The main paroxysmal explosion, at 1546:40 ejected incandescent material that fell onto the flanks and generated an ash plume rose 4 km above the summit that drifted SW. Material from the lateral explosions and eruption column collapse generated two highly turbulent pyroclastic flows that reached the sea. Hot material set fire to vegetation on the W side of the island. Strombolian activity resumed at 1559, though the explosions were more intense than normal. Spattering from Area C-S continued on 4 July, feeding lava flows that continued to enter the ocean.

Ulawun | New Britain (Papua New Guinea) : RVO reported that diffuse white plumes rose from Ulawun’s summit crater and the North Valley vent during 1-4 July, and from the summit only during 5-9 July. The seismic station located 11 km NW of the volcano recorded three volcanic earthquakes and some sporadic, short-duration, volcanic tremors during 1-3 July. The seismic station 2.9 km W of the volcano was restored on 4 July and recorded small sub-continuous tremors. Some discrete high-frequency volcanic earthquakes were also recorded on most days. Sulfur dioxide emissions were 100 tonnes per day on 4 July. According to the United Nations in Papua New Guinea 7,318 people remained displaced within seven sites because of the 26 June eruption.

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