Some of the boundaries that define this construct are the Kermadec, Izu Bonin and Bougainville trenches. It is more visibly comprised of such arcs as the New Hebrides, the Kuriles (CURE-eye-ulz), and the Aleutians. Nearly all deep-focus (*) earthquakes, and eighty percent of shallow-focus earthquakes worldwide, originate in the tectonic boundaries 
Some of the boundaries that define this construct are the Kermadec, Izu Bonin and Bougainville trenches. It is more visibly comprised of such arcs as the New Hebrides, the Kuriles (CURE-eye-ulz), and the Aleutians. Nearly all deep-focus (*) earthquakes, and eighty percent of shallow-focus earthquakes worldwide, originate in the tectonic boundaries that comprise this structure, which is more formally called the Circum-Pacific Belt. For 10 points, what is this circular zone at the margins of the Pacific Ocean, named for its high volcanic activity?
Some of the boundaries that define this construct are the Kermadec, Izu Bonin and Bougainville trenches.
the {ring} of {fire} [accept the {Circum}-{Pacific Belt} before it is read]