Use this interactive topographic map to track live global earthquakes (Magnitude 4.5+) and monitor active volcanic eruptions updated weekly.
To map this global tectonic activity, live seismic feeds were integrated directly from the U.S. Geological Survey (USGS) API, alongside weekly active eruption reports sourced from the Smithsonian Institution's Global Volcanism Program. The data was processed using GIS and layered over a high-resolution physical shaded relief base map to illustrate the relationship between plate boundaries and geological hazards.
A quick, visual intro to the global distribution of volcanoes, the most active belts, and where hazards are concentrated (2024–25 snapshot).
Counts differ by definition: "Holocene" (last ~12,000 years) vs. "potentially active."
*Iceland sits on a ridge and a hotspot — a special case.
Pacific "Ring of Fire" — about 75% of active volcanoes and ~90% of earthquakes arc around the Pacific basin.
Subduction arcs ringing the Pacific: Alaska–Aleutians, Cascades, Mexico/Central America, Andes, and the arcs of Japan, Philippines, Indonesia, PNG, Tonga–Kermadec, New Zealand.
From the Azores and Iberia through the Tyrrhenian (Etna, Vesuvius, Campi Flegrei), across the Aegean–Anatolian region toward Iran.
Vast submarine chains where seafloor spreads (e.g., Mid-Atlantic Ridge, East Pacific Rise). In Iceland the ridge is exposed on land.
Continental rifting from the Afar triple junction (Ethiopia/Djibouti) down through Kenya, Tanzania, into the western branch near D.R. Congo and Rwanda.
Hawai'i, Yellowstone, Galápagos, Canaries — intraplate volcanism creating island chains or continental calderas.
By Holocene volcano count (GVP):
| Country | Holocene | Active since 1800 |
|---|---|---|
| United States | 165 | 63 |
| Japan | 118 | 62 |
| Russia | 107 | 49 |
| Indonesia | 101 | 71 (most since 1800) |
| Chile | 90 | 35 |
Counts evolve as databases are updated, but the pattern is stable: the Pacific arcs dominate global activity.
"Danger" is a mix of hazard (explosive volcanism, lahars, tsunamis), exposure (nearby populations/infrastructure), and coping capacity.
Most eruptions by volume happen unseen on the seafloor along spreading ridges like the Mid-Atlantic Ridge and East Pacific Rise. On land, Iceland is a rare window into this process.
These submarine eruptions rarely threaten people directly but are fundamental to how Earth makes new crust.
Links are included with your download message so you can jump directly to each source.
Some of the world's most active volcanoes include:
Volcanoes consist of several key parts, contributing to their classification in various volcanic regions:
There are approximately 1,500 potentially active volcanoes worldwide, and you can find a volcano in many locations across the globe.
Countries with the highest concentrations of volcanoes include:
There are several volcano types:
The most dangerous types are often stratovolcanoes due to their explosive nature and ability to produce pyroclastic flows and lahars (mudflows).
Volcanoes are primarily found along tectonic plate boundaries, such as:
Volcanic eruptions affect millions of people each year through direct hazards like lava flows, ashfalls, and lahars, as well as indirect impacts such as crop damage, respiratory problems, and displacement.
Volcanoes also bring benefits:
Large volcanic eruptions can release significant amounts of sulfur dioxide into the stratosphere, leading to the formation of sulfuric acid aerosols that can temporarily cool the Earth's climate for months to years.
Examples include:
Notable calderas with potential global impact include:
Highly monitored volcanoes include:
These volcanoes are closely watched due to their historical activity and potential hazards to nearby populations.
Volcanic Ash
There are four types of eruption processes that produce volcanic ash:
Variations in eruption method and the characteristics of volcanic ashes vary on many factors, including magmatic temperature, gas content, viscosity, and crystal content of the magma before eruption. Volcanic ash is comprised of rock and mineral pieces and glass shards. Particle sizes range from meters for large blocks near the vent to nanometers for fine powdery ash inside well-dispersed eruption plumes.
Pyroclastic fallout (ash fall or tephra fall)
Volcanic ash (material less than 2 mm in width) or tephra (material greater than 2 mm in width) is created when magma is finely fragmented by vesiculation or when solidified rocks are smashed by the explosion of ground water into steam. Strong eruption plumes can carry the finest ash into the stratosphere, where strong winds spread it over many thousands of kilometers. Even a very small ash fall poses a serious nuisance to agricultural crops, exposed people, delicate machinery, and computers. Wind-borne ash is a serious abrasive danger to aircraft engines and instruments.
Lava flows
Lava flows are streams of super-hot molten rock that either feed out quietly from a vent or are fed by active lava fountains. Fluid basalt flows can move at velocities from 15 to 50 km/h on steep slopes, traveling many kilometers from their source. Viscous andesite lava flows move only a few km/h and rarely extend more than 8 km from their vent. Lava flows destroy everything in their path, but most move slowly enough that people can escape.
Lava domes
Lava too sticky to flow far from its vent (dacite or rhyolite) forms steep-sided mounds called lava domes.
Ash Clouds
An eruption column is described as the vertical or sub-vertical part of the emissions originating from an explosive volcanic vent. Eruption columns vary from very low, small-sized bursts to huge convective structures that quickly transport ash, volcanic gases, and suspended particles into the stratosphere. They have a lower gas-thrust zone that commonly represents less than 10% of the total height, above which is the umbrella region — a zone of momentum-driven rise with considerable lateral spreading.
Volcanic gases
The most common gases found with active volcanoes are water vapor, hydrogen, carbon dioxide, sulfur dioxide, hydrogen sulfide, helium, and deadly carbon monoxide and hydrochloric acid. Volcanic gases rarely reach populated areas in lethal concentrations, though sulfur dioxide can react with the atmosphere and fall as corrosive acid rain. Carbon dioxide is heavier than air and settles in depressions, where it can accumulate in deadly invisible concentrations and cause suffocation.
Pyroclastic flows and pyroclastic surges
These are large mixtures of hot rock fragments and gases that can race away from their source vents at super-hurricane velocity. Pyroclastic flows are very dense and most are confined to steep enclosed valleys around a volcano; the largest flows can travel tens and even hundreds of kilometers beyond a volcano. Because of their high speed and very high temperature, pyroclastic flows and surges kill or destroy almost all in their path.
Volcanic debris flows (mudflows or lahars)
Debris flows are a wet flowing mixture of water-saturated debris, somewhere between a debris avalanche and a water flood, typically moving at speeds of several tens of miles per hour on steep volcano slopes, slowing to less than 10 mph on gentle slopes. Debris flows can travel tens of miles down valley and devastate distant communities, as with Colombia during the 1985 eruption of Nevado del Ruiz.
Volcanic landslides
Volcanic landslides are gravity-driven slides of rock, soil, and vegetation that can occur in all sizes — from small surface debris to massive failures of an entire summit or flanks. Very heavy rainfall or a large earthquake can trigger landslides on steep volcanic slopes. Landslides that evolve into a chaotic tumbling flow are termed debris avalanches.
Caldera
A caldera is a large depression commonly formed by collapse following a massive explosive eruption of a large sub-surface body of stored magma. The huge calderas at Yellowstone and Long Valley are associated with eruption of silicic magma as pyroclastic flows. Kilauea caldera is thought to be associated with slow draining of basaltic magma from beneath its summit. Oregon's Crater Lake was produced by a monstrous eruption that destroyed a volcano the size of Mount St. Helens. An eruption and caldera creation of that scale today would be an "extinction-level event."
Caldera — A large volcanic collapse depression, commonly circular or elliptical when seen from above.
Cinder cone — A steep-sided volcano formed by the explosive eruption of cinders that form around a vent.
Complex volcano — A volcano composed of a mixture of landforms. In most cases, they occur because of changes either in eruptive habit or in location of the principal vent area.
Crater rows — An area of congealed lava produced by isolated lava fountains along a fissure (volcanic vent).
Fissure vent — Linear volcanic vents through which lava erupts, usually without any explosive activity. The vents are usually a few meters wide and may be many kilometers long.
Fumarole field — Areas where there are cracks in the ground that allow gases to reach the surface.
Hydrothermal field — An area where water heated by magma or in association with magma reaches the surface.
Lava dome — A rounded, steep-sided mount that forms when very viscous lava is extruded from a volcanic vent.
Maars — Shallow, flat-floored craters formed above diatremes as a result of a violent expansion of magmatic gas or steam. Maars often fill with water to form a lake.
Pyroclastic cone — A volcanic cone composed of fragmented material ejected from a volcano.
Scoria cones — A steep-sided volcano formed by the explosive eruption of a cinder cone. Scoria is formed when blobs of gas-charged lava are thrown into the air during an eruption and cool in flight, falling as dark volcanic rock containing cavities created by trapped gas bubbles.
Shield volcano — A volcano that resembles an inverted warrior's shield, with broad, gentle slopes, built by multiple eruptions of fluid basalt lava. Basalt lava tends to build enormous, low-angle cones because it flows across the ground easily and can form lava tubes that enable lava to flow tens of kilometers from an erupting vent.
Somma volcano — A large volcanic collapse depression that is partially filled by a new central cone.
Stratovolcano — A steep-sided volcano built by lava flows and tephra deposits. Tephra is solid material of all sizes explosively ejected from a volcano into the atmosphere.
Subglacial volcano — A volcanic form produced by eruptions beneath a glacier or beneath the surface of a lake within a glacier.
Submarine volcano — A volcanic form produced by eruptions in the ocean.
Tuff cone — A volcanic cone formed by the interaction of basaltic magma and water.
Tuff rings — Shallow, flat-floored craters formed by the interaction of magma and water.
Volcanic field — A collection of cinder cones and/or lava flows.
Timeframe D — Last known eruption B.C. (Holocene)
Timeframe D1 — Last known eruption in 1964 or later
Timeframe D2 — Last known eruption from 1900–1963, inclusive
Timeframe D3 — Last known eruption from 1800–1899, inclusive
Timeframe D4 — Last known eruption from 1700–1799, inclusive
Timeframe D5 — Last known eruption from 1500–1699, inclusive
Timeframe D6 — Last known eruption from A.D. 1–1499, inclusive
Timeframe D7 — Last known eruption B.C. (Holocene)
Timeframe Q — Quaternary eruption(s) with the only known Holocene activity being hydrothermal
Timeframe U — Undated, but probable Holocene eruption
Timeframe ? — Uncertain Holocene eruption