Mars Super-volcanoes?

Mars is a planet that now is a lifeless world with craters, volcanoes ice caps , and canyons. However Mars has once held life, And an atmosphere thanks to its volcanoes
But now the Planet has no known volcanic activity found so far. But pictures of some of the craters seem odd. They most likely were not normal volcanic or meteor craters. they had a similar landform that we see on Earth, a caldera. Calderas form when a massive magma chamber gains pressure and some magma rises. This causes the pressure to release suddenly, witch causes the land to collapse into the partly emptied magma chamber . Ash and lava then devastates hundreds of miles. This eruption is called a super volcano. There are several of them in the world. Scientist found at least three calderas on mars these super volcanoes would have majorly effected the red planet.