[en] A lava lake activity is observed at Nyamulagira volcano during this last decade. The training process of this lava lake began in 2012 by the release of gas fumes that was been continuously observed in the crater of the volcano. However no change in seismic activity was observed compared to the usual activity of the volcano until April 2014. On 22 June 2014, an activity of glow was observed by the Goma Volcano Observatory and the inhabitants of the city of Goma. On July 3rd 2014, the United States's organization NASA (National Aeronautics and Space Administration) noted this situation by its satellite detection and published on his Web site the apparition of a new lava lake in the crater of Nyamulagira. Nyamulagira volcano (in its known history) logged again a lave lake from 1921 to 1938. Here are analyzed the seismic activity which preceded this new event at mount Nyamulagira. It was found that this event was been preceded by a significant swarm activity of Long Period earthquakes in April 2014, six hybrid earthquakes and volcanic tremors in June 2014. The April 2014 swarm of low frequency earthquakes lasted about four days and was been located in the NorthEastern part of the Nyamulagira crater (at the place where appeared the new lava lake) and was been interpreted as expressed by the precursor movements of the opening of the crater. The six hybrid earthquakes were been interpreted also as the events that led to a falling movement of the land masses and the opening of the crater. After the visibility of the lava lake in June 2014, the activity of LP events reduced, no swarm and hybrid events were been recorded from this period, but the number of Volcano-Tectonic events remained constant.
Precision for document type :
Review article
Disciplines :
Earth sciences & physical geography
Author, co-author :
Birimwiragi Namogo, Didier ; Université de Liège - ULiège > Sphères ; Department of Seismology, Goma Volcano Observatory, Goma, Congo ; Department of Geology, Free University of Great Lakes, Goma, Congo
Mavonga, Georges; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Subira, Josué; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Kyambikwa, Albert; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Etoy, Modeste; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Assani, Delphin; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Rusangiza, Rigobert; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Fikiri, Antoine; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Wilonja, Jampy; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Lukaya, Francois; Department of Seismology, Goma Volcano Observatory, Goma, Congo ; Department of Geology, University of Goma, Goma
Cinyabuguma, Moise; Department of Seismology, Goma Volcano Observatory, Goma, Congo
Matamba, Pascal; Department of Seismology, Goma Volcano Observatory, Goma, Congo