BackgroundThe Boring Lava volcanic field, underlying part of the city of Portland, Oregon and neighboring areas to the east and across the Columbia River in Washington, was active from the Pliocene until about the mid-Pleistocene. The volcanic field consists of at least 32 to perhaps 50 small basaltic shield volcanoes and cinder cones, with a large concentration of vents located NW of the town of Boring, Oregon. Larch Mountain shield volcano near the eastern end of the volcanic field is the highest summit at 1236 m; most cones are about 200-300 m elevation. These volcanoes lie about 100 km west of the main Cascade Range volcanoes.
Source: Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8