Planetary scientists and volcanologists are debating the title of the largest volcano by comparing Olympus Mons on Mars and Tamu Massif on Earth [1, 2].
This comparison highlights the vast difference in geological activity and scale between Earth and its neighbors. Understanding these structures allows researchers to determine how volcanic processes vary across the solar system based on gravity and atmospheric conditions.
Olympus Mons is recognized as the largest known volcano in the solar system [1]. It stands approximately 22 km high, which is more than twice the height of Mount Everest [1]. The Martian volcano's base area covers about 300,000 square km, a size comparable to the country of Poland [1].
On Earth, the title for the largest known volcano belongs to Tamu Massif [2]. Located beneath the northwest Pacific Ocean, this underwater giant possesses a basal area of approximately 310,000 square km [2]. While it surpasses Olympus Mons in total basal area, it does not match the extreme vertical height of the Martian shield volcano.
Researchers use different metrics, such as height, volume, and basal area, to determine which volcano is the largest [1, 2]. The answer depends on whether the scope of the study is limited to Earth or encompasses the entire solar system [1, 2].
Because Olympus Mons dwarfs any volcano found on Earth in terms of height, it is often cited as the overall largest [1]. However, the sheer footprint of Tamu Massif establishes it as the dominant volcanic structure within Earth's oceans [2].
“Olympus Mons is recognized as the largest known volcano in the solar system.”
The distinction between these two volcanoes illustrates the impact of planetary gravity and plate tectonics. Earth's moving plates prevent volcanoes from growing to the size of Olympus Mons, while Mars' lack of plate tectonics allows lava to pile up in one location for millions of years, creating the solar system's tallest peak.
