While there are several volcanoes near Mexico City, none are considered "extremely violent".

Here are some of the volcanoes near Mexico City:

* Popocatépetl: Located about 70 km southeast of Mexico City, Popocatépetl is an active volcano that has experienced eruptions in recent years. However, while it is a potentially dangerous volcano, it's not considered "extremely violent" in terms of eruption frequency or intensity.

* Iztaccíhuatl: Located near Popocatépetl, Iztaccíhuatl is a dormant volcano and considered relatively inactive.

Please be careful about information about volcanoes, as it can be easily misconstrued. It's best to consult reliable sources like the U.S. Geological Survey (USGS) or a local volcanological institute.