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Latest News:

Heat radiation from Sierra Negra volcano during the past months (image: Mirova)
Tuesday, Oct 02, 2018
The eruption that had been going on since late June has significantly decreased or even stopped during Sep. The thermal signal from satellite data suggests that either lava effusion continues at strongly decreased rate or reflects the still hot surface from the significant new lava erupted during June-August. [meer...]
Wednesday, Sep 05, 2018
IG reported that the eruption at Sierra Negra that began on 26 June was divided into two main phases. ... [meer...]
 

Sierra Negra vulkaan

schildvulkaan 1124 m / 3687 ft
Isabela Island, Galapagos, -0.83°S / -91.17°W
Current status: normal or dormant (1 out of 5)
Sierra Negra webcams / Live-gegevens | Reports
Sierra Negra vulkaan boeken
Last update: 2 Oct 2018
Typical eruption style: mainly effusive
Sierra Negra vulkaanuitbarstingen: 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 yearsGeen recente aardbevingen
TijdMag. / DiepteAfstandLocatie
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

Sierra Negra Foto's:




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