The Tamu massif is the largest volcano on Earth, covering an area of over 120,000 square miles and located underwater off the east coast of Japan. It is believed to be 145 million years old and has been dormant for over 100 million years.
The Tamu massif, the largest volcano on Earth, covers an area of over 120,000 square miles (310,800 square kilometers). That equates to about the size of New Mexico, the United States, or Poland. The volcano is located underwater approximately 1,000 miles (1,609 kilometers) off the east coast of Japan in the Pacific Ocean. The Tamu massif is believed to be around 145 million years old. It has been dormant for more than 100 million years.
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The largest active volcano on Earth is Mauna Loa in Hawaii. It is less than 2% the size of the Tamu massif.
Olympus Mons, the largest volcano on Mars and in our solar system, is only 25% larger than the Tamu massif and can be seen from Earth on a clear night with a backyard telescope.
About 50-70 volcanoes erupt each year, many of them in the ocean.
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