Report on Erta Ale (Ethiopia) — January 2010
Bulletin of the Global Volcanism Network, vol. 35, no. 1 (January 2010)
Managing Editor: Richard Wunderman..
Erta Ale (Ethiopia) February 2010 visit reveals little change in South pit crater's lava lake since 2002
Please cite this report as:
Global Volcanism Program, 2010. Report on Erta Ale (Ethiopia). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 35:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN201001-221080.
13.6°N, 40.67°E; summit elev. 613 m
All times are local (unless otherwise noted)
Christoph Weber sent a report about his 8-11 February 2010 visit to Erta Ale. We last reported on Erta Ale after a visit by Weber in February 2009 (BGVN 34:07). The volcano is famous for molten lava lakes.
Activity at the S pit crater was comparable to that noted in December 2002 (figure 25, also see BGVN 28:04). The elliptical pit crater measured ~ 180 m E-W and ~ 140 m N-S. The upper platform (terrace T) inside the crater was, on 10 February 2010, covered by a lava flow, and the lava lake surface was ~ 20 m below the W rim (figure 26). On 9 February the 65-m-wide active lake in the W half of the crater rose and overflowed the lower ring terraces. Fountaining at the lava lake took place most of the time during the observations (figure 27), occasionally higher than the pit crater walls. Fresh lava spatters were found at the S pit crater's W edge. A sample was taken out of the lava lake.
|Figure 26. Photo looking W towards the southern Erta Ale pit crater taken 10 February 2010. Courtesy of C. Weber.|
|Figure 27. Fountaining of the Erte Ale lava lake in the southern pit crater on 9 February 2010. Courtesy of C. Weber.|
Geologic Background. Erta Ale is an isolated basaltic shield that is the most active volcano in Ethiopia. The broad, 50-km-wide edifice rises more than 600 m from below sea level in the barren Danakil depression. Erta Ale is the namesake and most prominent feature of the Erta Ale Range. The volcano contains a 0.7 x 1.6 km, elliptical summit crater housing steep-sided pit craters. Another larger 1.8 x 3.1 km wide depression elongated parallel to the trend of the Erta Ale range is located SE of the summit and is bounded by curvilinear fault scarps on the SE side. Fresh-looking basaltic lava flows from these fissures have poured into the caldera and locally overflowed its rim. The summit caldera is renowned for one, or sometimes two long-term lava lakes that have been active since at least 1967, or possibly since 1906. Recent fissure eruptions have occurred on the N flank.
Information Contacts: Christoph Weber, Volcano Expeditions International (VEI), Muehlweg 11, 74199 Untergruppenbach, Germany (URL: http://www.v-e-i.de/).