Report on San Cristobal (Nicaragua) — 10 June-16 June 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
10 June-16 June 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on San Cristobal (Nicaragua). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 10 June-16 June 2015. Smithsonian Institution and US Geological Survey.
12.702°N, 87.004°W; summit elev. 1745 m
All times are local (unless otherwise noted)
INETER reported that at 0907 on 12 June an explosion at San Cristóbal generated a gas-and-ash plume that rose 2 km and drifted SE. An explosion at 1835 produced a gas plume with low ash content; the height of the plume was unable to be determined due to inclement weather. INETER noted that seismicity remained at background levels. Seismic signals detected a lahar between 1850 and 1929; an observer reported that the small lahar descended the W and SW flanks.
Geological Summary. The San Cristóbal volcanic complex, consisting of five principal volcanic edifices, forms the NW end of the Marrabios Range. The symmetrical 1745-m-high youngest cone, named San Cristóbal (also known as El Viejo), is Nicaragua's highest volcano and is capped by a 500 x 600 m wide crater. El Chonco, with several flank lava domes, is located 4 km W of San Cristóbal; it and the eroded Moyotepe volcano, 4 km NE of San Cristóbal, are of Pleistocene age. Volcán Casita, containing an elongated summit crater, lies immediately east of San Cristóbal and was the site of a catastrophic landslide and lahar in 1998. The Plio-Pleistocene La Pelona caldera is located at the eastern end of the complex. Historical eruptions from San Cristóbal, consisting of small-to-moderate explosive activity, have been reported since the 16th century. Some other 16th-century eruptions attributed to Casita volcano are uncertain and may pertain to other Marrabios Range volcanoes.