I live near Lake Taal, on the island of Luzon. The USGS rates it as the greatest risk of a humanitarian disaster, not because of its frequent eruptions -- they are quite mild -- but because of the massive caldera it has excavated by a pre-historical string of massive eruptions and the proximity of 17 million Filipinos (Manila). The caldera is primarily filled by a lake, with smaller islands of volcanic activity in it.

One look at your lead photo, And I instantly believed your article's title. That ridge beyond the cone was created by a massive eruption and a cladera collapse. The cone is the result of subsequent eruptions gradually fill the caldera.