Report on Telica (Nicaragua) — 23 September-29 September 2015

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 23 September-29 September 2015
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2015. Report on Telica (Nicaragua). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 23 September-29 September 2015. Smithsonian Institution and US Geological Survey.

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Telica

Nicaragua

12.602°N, 86.845°W; summit elev. 1061 m

All times are local (unless otherwise noted)


INETER reported that a 30-minute period of moderate-intensity explosions at Telica began at 0800 on 23 September. Abundant gas-and-ash emissions initially rose 400 m above the crater and drifted WNW, but then decreased to 50 m. Ashfall was reported in the community of Guanacastal. Explosions occurred at 1645 and 1648. Scientists conducting fieldwork observed deposits on the crater floor from an inner-wall landslide that had occurred on 17 July, and new fumaroles on the crater floor. Five explosions were detected on 24 September. Based on wind and satellite data, the Washington VAAC reported that on 26 September ash plumes rose as high as 3.6 km (12,000 ft) a.s.l. and drifted W and N. During 28-29 September INETER noted that voluminous gas plumes rose from two vents on the crater floor.

Geologic Background. Telica, one of Nicaragua's most active volcanoes, has erupted frequently since the beginning of the Spanish era. This volcano group consists of several interlocking cones and vents with a general NW alignment. Sixteenth-century eruptions were reported at symmetrical Santa Clara volcano at the SW end of the group. However, its eroded and breached crater has been covered by forests throughout historical time, and these eruptions may have originated from Telica, whose upper slopes in contrast are unvegetated. The steep-sided cone of 1061-m-high Telica is truncated by a 700-m-wide double crater; the southern crater, the source of recent eruptions, is 120 m deep. El Liston, immediately SE of Telica, has several nested craters. The fumaroles and boiling mudpots of Hervideros de San Jacinto, SE of Telica, form a prominent geothermal area frequented by tourists, and geothermal exploration has occurred nearby.

Sources: Instituto Nicarag├╝ense de Estudios Territoriales (INETER), Washington Volcanic Ash Advisory Center (VAAC)