Report on Telica (Nicaragua) — September 1994
Bulletin of the Global Volcanism Network, vol. 19, no. 9 (September 1994)
Managing Editor: Edward Venzke
Telica (Nicaragua) Explosion followed by decreased seismicity
Please cite this report as:
Global Volcanism Program, 1994. Report on Telica (Nicaragua). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 19:9. Smithsonian Institution. http://dx.doi.org/10.5479/si.GVP.BGVN199409-344040.
12.606°N, 86.84°W; summit elev. 1036 m
All times are local (unless otherwise noted)
A phreatic explosion on 12 August followed strong tremor two days earlier. Activity that began on 31 July produced a gas-and-ash column that rose ~800 m above the 1,060-m-high summit; detectable amounts of ash fell as far as ~17 km from the summit source vent (BGVN 19:07). Strong tremor again took place on 28 August. From that time until mid-September, weak tremor and few events of high or low frequency were recorded. Geochemical monitoring revealed decreases in SO2, Cl, and F gases. The most significant morphological change in the inner crater was the joining of crater fumaroles A and B (figure 7).
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 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 E, 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.
Information Contacts: H. Taleno, L. Urbina, C. Lugo, and O. Canales, INETER.