Currently, there are no active volcanoes in Puerto Rico and the Virgin Islands; the last volcanoes were active approximately 30 million years ago. The nearest volcano to Puerto Rico is Mount Pelée, an active stratovolcano near the northern end of Martinique, an island and French overseas territory in the Caribbean's Lesser Antilles Volcanic Arc. Its volcanic cone comprises stacked layers of ash and lava that have been cemented. 1932 saw its most recent eruption. It is considered the most active volcano in the Caribbean. At least four eruptions have occurred in the prior 250 years, including phreatic eruptions in 1792 and 1851 and, more recently, magmatic eruptions that produced lava domes in 1902–1905, 1929–1932, and elsewhere. Some mitigation efforts for Mount Pelée include creating hazard maps, studying the volcano, and creating a disaster plan in the instance that another catastrophic eruption occurs. When the volcano erupted in 1932, the post-disaster mitigation efforts included: bringing boats to remove survivors, evacuating the nearby towns, providing monetary support for the displaced people, and donations from all around the world.
https://tourcrib.com/en/blog/vacation/martinique-volcano-pelee
https://volcano.si.edu/volcano.cfm?vn=360120
https://www.nsm.buffalo.edu/courses/gly433/pdfPowerPoint/Hanson.pdf
https://pages.mtu.edu/~gbluth/Teaching/GE4150/lecture_pdfs/L8_pelee.pdf
https://oceanexplorer.noaa.gov/okeanos/explorations/ex1811/background/geology/welcome.html#:~:text=There%20are%20currently%20no%20active,8%2C300%20meters%20(5.2%20miles).
