Three kinds of boundary
USGS Circular 1198, in the chapter on earthquakes, faults, and tectonics, describes the Pacific–North American boundary as a transform, where the plates slide horizontally. The major surface break is the San Andreas system, about 1,300 km long, connecting the East Pacific Rise east of Baja California to the Gorda Ridge. West of the San Andreas, the Pacific plate moves northwest relative to North America. South of the fault, the East Pacific Rise is a divergent boundary, where new crust forms. North of the fault, the Juan de Fuca plate dives beneath North America and is consumed. Those three sentences are the plate-boundary map in miniature: transform, divergent, convergent.
Where the Ring of Fire fits
USGS notes that most earthquakes and volcanic eruptions occur along plate boundaries, and that one of the most active is the margin of the Pacific plate, commonly called the Pacific Ring of Fire. Convergent margins — subduction — are the ones that build the volcanic arcs in our catalog: the Andes, the Cascades, Japan, the Aleutians, and the Sunda arc. The San Andreas page is the transform exception people mix in. The Cascadia page is the convergent margin at the north end of that California system.
Intraplate is the leftover category
Not every earthquake or volcano is on a boundary. Kīlauea is coded intraplate, oceanic crust, in the hotspot group, and it falls outside our rectangles. New Madrid is intraplate seismicity in the middle of North America. Calling both “Ring of Fire” because they are famous would erase the catalog’s tectonic field.
Our rectangles, again
The About page lists the lat/lon boxes we use as a Pacific rim belt. They approximate the convergent arcs and a few linked areas such as the Scotia arc. They are not the plate polygons in a geodetic model. If a point is inside a box, the live map can filter to it. If it is outside, the map can still show the earthquake. The filter is a view, not a tectonic law.