Poás volcano remains an authentic open-air laboratory and, day after day, continues to provide inputs for scientists who follow the path to Costa Rican volcanism.
Although the most important eruptive peak was experienced in the first half of 2017, the colossus still has important activity.
On July 26th, the Costa Rican Volcanological and Seismological Observatory (Ovsicori) published a video that shows the sulfur columns and their repercussions on the volcanic summit. These were observed in different events of eruptive activity of the volcano. The variety of sizes, color, texture and density is enormous, ranging from a few millimeters to some huge 70 centimeters (observed in March 2006), from bright yellow to dark gray. The surface varies from smooth to rough and as in this case the smallest sample probably cracks by thermal expansion.
The sulfur involved is glassy, greasy, shiny and capable of draining, so thread formation is not uncommon. In the past, the exit of that sulfur from the blocks has assumed different forms that vary from huge pores to tiny cones. The most common form includes spills from a few millimeters to several centimeters wide with similar thicknesses.