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Sand Mountain volcano

cinder cones 1664 m / 5,459 ft
Oregon, USA (mainland exept Alaska), 44.38°N / -121.93°W
Current status: dormant (1 out of 5) | Reports
Sand Mountain volcano books
Typical eruption style: Explosive
Sand Mountain volcano eruptions: 70 AD ± 150, 800 BC ±300, 900 BC ± 100, 1740 BC ± 300, 2290 BC ± 300 (all radiocarbon dated)
TimeMag. / DepthDistanceLocation
Wed, 18 Apr
Wed, 18 Apr 05:44 UTCM 1.3 / 3.4 km15 km- 32km NNW of Sisters, Oregon
Sand Mountain is a cluster of 23 cinder cones NW of Mt Washington, Oregon. The youngest eruption took place to form Lost Lake cinder cone at the north end of the chain about 2000 years ago.

Background:

Most of the 23 basaltic and basaltic-andesite cinder cones of Sand Mountain volcanic field are aligned along a N-S trending line immediately west of the Cascade crest NW of Mount Washington. A secondary trend of alignment in NNW and NNE direction intersects the N-S line near the largest cinder cone, Sand Mountain.
Geologically young lava flows from vents on the western side were erupted between 3000-4000 years ago. The lava flows traveled mostly to the west, blocking local drainages and forming several small lakes.
Source: GVP

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