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. During the first two days of August 2016 a seismic crisis occurredon Brava, Cabo Verde, which – according to observations based on a localseismic network – was characterized by more than a thousand volcano-seismicsignals. Brava is considered an active volcanic island, although it has notexperienced any historic eruptions. Seismicity significantly exceeded theusual level during the crisis. We report on results based on data from atemporary seismic-array deployment on the neighbouring island of Fogo at adistance of about 35 km. The array was in operation from October 2015 toDecember 2016 and recorded a total of 1343 earthquakes in the region of Fogoand Brava; 355 thereof were localized. On 1 and 2 August we observed 54earthquakes, 25 of which could be located beneath Brava. We further evaluatethe observations with regards to possible precursors to the crisis and itscontinuation. Our analysis shows a significant variation in seismicityaround Brava, but no distinct precursory pattern. However, the observationssuggest that similar earthquake swarms commonly occur close to Brava. Theresults further confirm the advantages of seismic arrays as tools for theremote monitoring of regions with limited station coverage or access.

Remote monitoring of seismic swarms and the August 2016 seismic crisis of Brava, Cabo Verde, using array methods