Report on Cerro Negro (Nicaragua) — 5 June-11 June 2013
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 June-11 June 2013
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2013. Report on Cerro Negro (Nicaragua). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 5 June-11 June 2013. Smithsonian Institution and US Geological Survey.
12.506°N, 86.702°W; summit elev. 728 m
All times are local (unless otherwise noted)
INETER reported that the seismic station at the base of Cerro Negro recorded the onset of tremor at 0845 on 4 June. Seismicity fluctuated; Real-time Seismic Amplitude Measurement (RSAM) values increased to 60 units, from an average value of 14. From 1535 to 1731 the network recorded 49 earthquakes that were too small to be located.
Geologic Background. Central America's youngest volcano, Cerro Negro, was born in April 1850 and has since been one of the most active volcanoes in Nicaragua. Cerro Negro is the largest, southernmost, and most recent of a group of four youthful cinder cones constructed along a NNW-SSE-trending line in the central Marrabios Range 5 km NW of Las Pilas volcano. Strombolian-to-subplinian eruptions at Cerro Negro at intervals of a few years to several decades have constructed a roughly 250-m-high basaltic cone and an associated lava field that is constrained by topography to extend primarily to the NE and SW. Cone and crater morphology at Cerro Negro have varied significantly during its eruptive history. Although Cerro Negro lies in a relatively unpopulated area, its occasional heavy ashfalls have caused damage to crops and buildings in populated regions of the Nicaraguan depression.