Available Weekly Reports
18 June-24 June 2008
According to news articles, a bulletin issued from Galápagos National Park indicated that eruptive activity from Cerro Azul decreased considerably during 16-17 June and on 18 June incandescent material was no longer ejected.
Sources: EFE News Service
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Summary of eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|2008 May 29||2008 Jun 17||Confirmed||1||Historical||Summit and SE flank|
|1998 Sep 15||1998 Oct 21||Confirmed||1||Historical||N & W caldera floor, SE flank (630-680 m)|
|1979 Jan 29||1979 Mar 4 (in or after)||Confirmed||2||Historical||East flank (300 m) and summit|
|[ 1968 Jun 12 ]||[ Unknown ]||Uncertain||North flank?|
|1959 Jun 29||1959 Jul 31 (?)||Confirmed||2||Historical||East flank|
|1948 Jun 30 ± 30 days||Unknown||Confirmed||0||Historical|
|1943 Apr 13 ± 2 days||1943 May 11 (?)||Confirmed||3||Historical||Caldera ring fracture|
|1940||Unknown||Confirmed||0||Historical||East flank (Cerro de Las Animas)|
|1850 (after)||Unknown||Confirmed||1||Surface Exposure|
|1250 (after)||Unknown||Confirmed||0||Surface Exposure|
|550 BCE ± 1000 years||Unknown||Confirmed||0||Surface Exposure|
|950 BCE ± 1000 years||Unknown||Confirmed||0||Surface Exposure|
Located at the SW tip of the J-shaped Isabela Island, Cerro Azul contains a steep-walled 4 x 5 km nested summit caldera complex that is one of the smallest diameter, but at 650 m one of the deepest in the Galápagos Islands. The 1640-m-high shield volcano is the second highest of the archipelago. A conspicuous bench occupies the SW and west sides of the caldera, which formed during several episodes of collapse. Youthful lava flows cover much of the caldera floor, which has also contained ephemeral lakes. A prominent tuff cone located at the ENE side of the caldera is evidence of episodic hydrovolcanism at Cerro Azul. Numerous spatter cones dot the western flanks of the volcano. Fresh-looking lava flows, many erupted from circumferential fissures, descend the NE and NW flanks of the volcano. Historical eruptions date back only to 1932, but Cerro Azul has been one of the most active Galápagos volcanoes since that time. Solfataric activity continues within the caldera.