Djibouti lies at the junction of three active, major
coastal spreading centers: the Eastern Africa Rift
zone, which extends south-southwestward from Djibouti
through Kenya and north-northwestward through Eritrea
to the Red Sea; the Red Sea Rift, which extends
northward beneath the Red Sea, the Gulf of Aqaba,
and the Dead Sea and terminates in northern Syria;
and the Gulf of Aden and its westward extensions
into Djibouti - the Gulf of Tadjourah and the Ghoubbet
el Kharab.
This structural junction is unique, being the focal
point of very high heat flux. Although direct measurements
are unavailable, it is undoubtedly among the highest
heat fluxes on earth (ENEL/ DPT 1990). The rift
zone is still expanding by about one mm per year.
The last volcanic eruption occured in 1978 when
the Ardoukoba volcano erupted.
According to a recent study by the Geothermal Energy
Association (Reed, 1999), the geothermal potential
in Djibouti is between 230 MW and 860 MW from a
number of prosepcts.
http://www.uneptie.org/energy/act/re/geo-conference/docs/marketreport.pdf
