About Santiago
Santiago is a shield rising to 920 meters (3,019 feet) in Ecuador's Eastern Pacific Volcanic Regions. It last erupted in 1906 CE, and volcanologists consider it an active volcanic system. The volcano has produced 3 recorded eruptions.
Geography & Climate
Santiago is located in Ecuador, within the Galapagos Hotspot Volcano Group of the broader Eastern Pacific Volcanic Regions. Situated at 0.22° S, 90.77° W in the Southern Hemisphere, the volcano lies within a tropical climate zone. With a summit elevation of 920 meters above sea level, Santiago is a moderately sized peak that remains accessible to hikers and researchers for much of the year. The volcanic landform is characterized as a shield, which describes the physical shape and structure of the volcanic edifice as observed from the surface.
Geological Context
Santiago is situated along a rift zone, where tectonic plates are pulling apart. As the crust thins and fractures, magma rises to fill the gap, creating volcanic activity. Rift volcanism typically produces more fluid lava flows rather than explosive blasts, which means communities near Santiago in Ecuador generally face slower-moving hazards like lava flows and ground fissures rather than sudden pyroclastic events. However, rift volcanoes can still generate significant ash emissions and gas releases that affect local air quality. The dominant rock type is basalt / picro-basalt, a dark, fine-grained volcanic rock that forms from rapidly cooling, low-viscosity lava. Basaltic eruptions tend to be less explosive and produce fluid lava flows that can travel long distances. While less immediately dangerous than explosive eruptions, basaltic lava flows can destroy structures and infrastructure in their path, and volcanic gases released during these eruptions can affect air quality over a wide area.
Eruption History Summary
Santiago has 3 recorded eruptions in the geological database, spanning from 1759 CE to 1904 CE. These eruptions span roughly 145 years of volcanic history. The most recent eruption in 1904 CE places this volcano within the modern era of volcanological observation.
GVP Reference Summary
The elongated shield volcano of Santiago Island, also known as San Salvador Island or James Island, has numerous scattered Holocene pyroclastic cones. Fresh-looking lava flows from these cones cover the flanks. The summit ridge, lined with a chain of NW-trending cinder and spatter cones, is located at the NW end of the island. Prominent flank tuff cones occur at the western and eastern coasts. The most recent activity has been concentrated at the NW and SE ends of the island. The pahoehoe lava flows at James and Sullivan Bays, on opposite ends of the island, were erupted in the past few hundred years. The James Bay flows were dated by fragments of marmalade pots left by buccaneers in 1684 that were subsequently embedded in the lava flows described by Charles Darwin in 1835.
— Smithsonian Institution, Global Volcanism Program
3 Recorded Eruptions
| Year | VEI | Type | Area |
|---|---|---|---|
| 1904 | 0 | Confirmed Eruption | SE flank |
| 1897 | 0 | Confirmed Eruption | SE flank (Sullivan Bay?) |
| 1759 | — | Confirmed Eruption | West flank (James Bay) |
Real-Time Data
USGS Alert Level
Thermal Anomalies
Frequently Asked Questions About Santiago
Is Santiago an active volcano?+
Yes, Santiago is considered an active volcano. Its most recent eruption was in 1906 CE. The volcano is monitored by geological agencies, and its activity status is based on observed eruptions within recorded history.
When did Santiago last erupt?+
The most recent recorded eruption of Santiago occurred in 1904 CE with a Volcanic Explosivity Index (VEI) of 0. The eruption was classified as a "Confirmed Eruption." Santiago has 3 recorded eruptions in total.
How high is Santiago?+
Santiago has a summit elevation of 920 meters (3,019 feet) above sea level. At 920 meters, it is a relatively low-elevation volcano.
What type of volcano is Santiago?+
Santiago is classified as a Shield. Shield volcanoes have distinct geological characteristics that set them apart from other volcanic types.
Where is Santiago located?+
Santiago is located in Ecuador, in the Eastern Pacific Volcanic Regions. More specifically, it lies within the Galapagos Hotspot Volcano Group. Its exact coordinates are -0.220° latitude, -90.770° longitude.
Is it safe to visit Santiago?+
Visiting Santiago requires checking current volcanic activity and alert levels. As an active volcano with eruptions as recent as 1906 CE, conditions can change rapidly. Always consult local geological authorities and follow official warnings before visiting. Many active volcanoes have designated safe viewing areas and guided tour options.
