It's been a while since I've done one of these. This is an image of Jim Driscoll and I at the Tower Hill Maar in Western Victoria, 2013. He's into sedimentology and geothermal research and is just about to finish his PhD at Monash University. For the last couple of years we've assisted with the JMSS geology field trip and this is one of the locations we take the students.
This is a nested maar system is the result of a sequence phreatomagmatic eruptions (note the huge number of layers behind us) resulting in a complex structure seen today. Multiple scoria cones are surrounded by a crater lake (which is probably formed by multiple vents). The countryside around Tower Hill is covered by these ash and scoria layers which all slope gently away from the site of the volcano.The volcano also ejected larger bombs, the impact of one can be seen over my right shoulder. The shape of these craters can help determine the trajectory of the bomb and allows volcanologists to determine the sequence in which the vents were actives.
This is a nested maar system is the result of a sequence phreatomagmatic eruptions (note the huge number of layers behind us) resulting in a complex structure seen today. Multiple scoria cones are surrounded by a crater lake (which is probably formed by multiple vents). The countryside around Tower Hill is covered by these ash and scoria layers which all slope gently away from the site of the volcano.The volcano also ejected larger bombs, the impact of one can be seen over my right shoulder. The shape of these craters can help determine the trajectory of the bomb and allows volcanologists to determine the sequence in which the vents were actives.
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