Sierra Negra (Ecuador) - Report for 4 July-10 July 2018 - NEW

IG reported that a new magmatic intrusion at Sierra Negra was heralded by a M 5.2 earthquake recorded at 1830 on 4 July, and followed by 68 events between M 1.1 and 3.9.
Seismic tremor began to be recorded at 1700 on 7 July by a station on the NE edge of the caldera.
At the same time satellite data showed an increase in the intensity of the thermal anomaly on NW flank (it had decreased the previous day).
Parque Nacional Galápagos staff confirmed strong incandescence in an area near the beach.
A weak plume of water vapor and ash rose as high as 3.3 km (10,800 ft) a.s.l.
and drifted SW and W.
Tremor continued to be registered on 8 July, though the amplitude gradually decreased.
Vapor-and-ash plumes reported by the Washington VAAC rose about 2 km (6,600 ft) a.s.l.
and drifted SW, and the thermal anomaly remained intense.
Gas clouds drifted 115 km W.
The current eruption at Sierra Negra began on 26 June and, according to news articles, prompted tourist restrictions and the evacuation of 50 residents.

Sources: BBC News,Instituto Geofísico-Escuela Politécnica Nacional (IG)

Fonte/Source: Global Volcanism Program/Smithsonian Institution


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