That the towns of Taal and Lemery are starting to display volcanic fissures due to the recent phreatic eruption of Taal Volcano last January 12 should not be surprising had their people known their violent geological history.
Before the mid-18th century, Taal Lake was technically not a lake because it was connected to Balayán Bay via a wide channel (encircled in red). Subsequent eruptions buried this channel, creating what is now a large part of the Municipality of Lemery (named after José Nicolás Francisco Pablo Lemery, the Governor-General who ruled the country at the time of Rizal’s birth). One old Spanish newspaper (the name escapes me at the moment) even reported that a huge chunk of a mountain called Malaquíng Bintî —otherwise known as Binintiang Malaki, that picturesque little cone that we all know from postcards— was flung all the way to where Lemery is now situated due to a violent eruption. That closed the channel, blocking the waterway. Thus Taal Lake was born. That cataclysmic event also trapped several sea animals, including bull sharks, inside the lake. When the lake’s salinity subsided due to years of rainfall, these sea creatures learned to adapt to it instead of dying out (unfortunately, the bull sharks did not survive the notorious #BobongPinoy mentality; they were totally wiped out sometime in the 1930s). Today, what is perhaps a remnant of that ancient channel is now the Pansipit River which divides Lemery from the heritage town of Taal. Both towns, especially Lemery, sit on fragile grounds.
And even as we speak, it appears that the volcano is again trying to take away that last, small outlet that connects its lake to the sea.