Dome names and periods of activity, from left to right: El Caliente (1929 - 1939, 1967 - present), La Mitad (1939 - 1949), El Monje (1949 - 1958), El Brujo (1958 - 1977). Info source: Harris et al., Bull. Volc., 2003. For zooming purposes this photo is a better bet.
These two videos are from people that climbed onto the erupting dome, the first during an eruption and the second of walking into the crater. Note that this is not particularly 'safe' as discussed here.
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