We all know that we have different personality traits that make us unique human beings. Some of us seem to prefer order and predictability. We feel comfortable when we work on a schedule. A good day is when we can check everything off our to do list. While others of us are more spontaneous and become bored when things are too predictable.
Venus has over 150 large shield volcanoes. These shields are mostly between 100 and 600 km across, with heights between about 0.3 and 5.0 km. The largest shields, however, are over 700 km in diameter and up to 5.5 km in height.
We now consider the products of very large eruptions beginning at the local scale and extending outwards from the source volcano. An eruption of around 450 km3 of magma would form a caldera at least 15 km diameter, extending up to Toba-size depressions (approx. 100 km) for the largest eruptions.