Arjuno-Welirang and the LUSI Mud Volcano, Java

LUSI mud volcano.  Photo is undated, but likely around 2008 – 2009 after containing levees subsided.  White steam, hot water, liquid-rich mud, and natural gas is being erupted at the time.  Image courtesy Earth Magazine, 2018

Dotsero Volcanic Complex, Colorado, USA

Remaining maar of Dotsero volcanic complex.  Image courtesy Our Community Nov, 2019

Dotsero is the most recent of four quaternary volcanic centers in NW Colorado.  The locations and relative ages are: Dotsero (4,150 years ago), Willow Peak (undated), McCoy (0.64 Ma) and Triangle Peak (1.98 – 1.87 Ma).  Triangle Peak was the only one of these not monogenetic as it produced at least 11 lava flows before activity stopped.  Willow Peak is described as a young cinder cone with a narrow lava flow extending 6 – 7 km E.