Why the US has the most volcanoes in the world.

When asked about the country with the largest number of volcanoes in the world , many people often think of Indonesia, where numerous eruptions have occurred, or Russia, with its vast land area. However, neither of these answers is correct.

Cleveland Volcano in Alaska. Photo: AVO/UAFGI/Pavel Izbekhov

According to IFL Science, the United States actually has the most volcanoes in the world, far exceeding the number of countries that follow. According to the Smithsonian Institution's Global Volcanology Program, the US has 165 volcanoes that have erupted in the last 12,000 years. Japan ranks second with nearly 50 fewer volcanoes, followed by Russia and Indonesia.

Most of America's volcanoes are located in Alaska, while the rest are distributed along other areas in the west, for example, the Cascade Range stretching from Washington to Northern California, and Hawaii.

Volcanoes in Alaska and the West lie along the "Ring of Fire"—a 40,250-kilometer-long, horseshoe-shaped structure encircling the Pacific Ocean, and one of the most volcanic and seismically active regions in the world. Volcanic activity is frequent here due to tectonic processes.

The Ring of Fire is where many of Earth's tectonic plates meet the largest plate: the Pacific Plate. When they collide, the denser plate slides beneath the other due to subduction. In this process, a portion of the denser plate melts into magma, which rises through the plate above and eventually erupts.

Kilauea volcano is expected to erupt on April 23, 2026. Photo: YouTube/USGS

The most recent eruption of this type in the United States occurred in 1980, originating from Mount St. Helens in Washington. According to the U.S. Geological Survey (USGS), the event caused numerous injuries and 57 deaths, making it the most destructive eruption in the country's history. However, in terms of the amount of material ejected, the 1912 eruption of Mount Katmai in Alaska was far larger. This volcanic "fury" released approximately 13.5 cubic kilometers of lava, making it the largest eruption of the 20th century.

Additionally, Hawaii is home to one of the world's most active volcanoes, Kilauea. But unlike St. Helens and Katmai, it's not located along the Ring of Fire but on a "hot spot." This is an unusually hot area in the mantle (the layer beneath the Earth's crust) compared to the surrounding rock, causing updrafts of material to rise through the mantle and crust, erupting on the surface. These eruptions can last for a very long time; for example, Kilauea has been erupting for over a year, creating spectacular scenes.

Despite having the most volcanoes in the world, the United States is not the most volcanically active country. That title is often attributed to Indonesia, which has 101 volcanoes and millions of people living very close to them.

( According to vnexpress.net )

Source: https://baodongthap.vn/ly-do-my-co-nhieu-nui-lua-nhat-the-gioi-a240753.html