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Latest News:

The nighttime sky is turned red due to the red glow from the lava fountaining from the fissures, forming multiple rivers flowing towards the ocean (image shared on Facebook page of Christian Saá)
Wednesday, Jun 27, 2018
After two prolonged seismic crises with earthquakes up to M5.3, the Sierra Negra volcano entered a new eruptive phase with strong fountaining and multiple lava flows on Tuesday 26 June 2018 - the first volcanic activity since its last eruption in 2005. ... [more]
 

Sierra Negra volcano

shield volcano 1124 m / 3687 ft
Isabela Island, Galapagos, -0.83°S / -91.17°W
Current status: erupting (4 out of 5)
Sierra Negra webcams / live data | Reports
Sierra Negra volcano books
Last update: 27 Jun 2018 (fissure eruption with fountaining and lava flows)
Typical eruption style: mainly effusive
Sierra Negra volcano eruptions: 2018 (June), 2005 (Oct), 1979-80, 1963, 1957, 1954, 1953, 1948, 1911, 1860, 1844, 1817, 1813, 1350 ± 500 years, 1060 ± 500 years, 370 AD ± 1100 years, 1250 BC ± 100 years, 8250 BCE ± 1600 years
TimeMag. / DepthDistanceLocation
Sat, 21 Jul
Sat, 21 Jul 16:35 UTCM 4.3 / 1 km4 kmGALAPAGOS ISLANDS, ECUADOR
Fri, 20 Jul
Fri, 20 Jul 16:19 UTCM 3.4 / 2 km7 kmGALAPAGOS ISLANDS, ECUADOR
Fri, 20 Jul 15:45 UTCM 3.7 / 1 km6 kmGALAPAGOS ISLANDS, ECUADOR
Thu, 19 Jul
Thu, 19 Jul 21:12 UTCM 3.2 / 1 km1 kmGALAPAGOS ISLANDS, ECUADOR
Thu, 19 Jul 20:59 UTCM 3.2 / 1 km4 kmGALAPAGOS ISLANDS, ECUADOR
View all recent quakes
Sierra Negra is one of the largest and most active volcanoes in the Galapagos Islands. A typical shield volcano, it has an oval caldera, which measures 9 km east-west and 7 km north-south. It has produced at least 10 eruptions in historical times, with an average resting period of only 15 years between each eruptive period.
The last two eruptions occurred in 1979 and 2005 (as of early 2018).

Background:

The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the Galápagos Islands. Flank vents abound, including cinder cones and spatter cones concentrated along an ENE-trending rift system and tuff cones along the coast and forming offshore islands.
The 1124-m-high volcano is elongated in a NE direction. Although it is the largest of the five major Isabela volcanoes, it has the flattest slopes, averaging less than 5 degrees and diminishing to 2 degrees near the coast. A sinuous 14-km-long, N-S-trending ridge occupies the west part of the caldera floor, which lies only about 100 m below its rim. Volcán de Azufre, the largest fumarolic area in the Galápagos Islands, lies within a graben between this ridge and the west caldera wall.
Lava flows from a major eruption in 1979 extend all the way to the north coast from circumferential fissure vents on the upper northern flank. Sierra Negra, along with Cerro Azul and Volcán Wolf, is one of the most active of Isabela Island volcanoes.
Source: GVP

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