The fault that caused the volcanoes that formed the Izu islands is the same as the one that formed the Marianas Trench.
“the convenience store at the terminal [to take ferries to the Izu islands from Tokyo] stocks gas marks” to protect from volcanic gas (Getting Wet pg 35)
“Tokyo’s emergency center, where tons of supplies for the next big seismic disaster are stored, is right next to [a fault line]“Getting Wet pg 23
