This image shows the volcano Olympus Mons. With a diameter of ... By some estimates, the most recent large volcanic eruption at Olympus Mons occurred only 25 million years ago. ... The caldera is about 65 × 80 kilometers across (the size of Rhode Island) and occurs near the maximum elevation of the volcano. read more
The oldest activity at Olympus Mons could be much older than this and would have been buried by younger lava flows. The caldera of Olympus Mons is the depression near the top center of the image. The caldera is about 65 × 80 kilometers across (the size of Rhode Island) and occurs near the maximum elevation of the volcano. read more
Reasons for the collapse of Olympus Mons during the early history of Mars revolve around the idea of having a weak basal layer beneath Olympus Mons (McGovern and Morgan, 2009). read more
Only two craters are visible here, indicating that Olympus Mons is young, probably the youngest volcanic feature on Mars. By some estimates, the most recent large volcanic eruption at Olympus Mons occurred only 25 million years ago. read more