Signal Peak

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Signal Peak volcano

shield volcano 1555 m / 5,102 ft
Washington, USA (mainland exept Alaska), 46.23°N / -121.14°W
Current status: (probably) extinct (0 out of 5)

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Typical eruption style: ? effusive lava flows
Signal Peak volcano eruptions: ca. 1-0.5 million years ago
Last earthquakes nearby:

Time	Mag. / Depth	Distance	Location
Thu, 28 Mar
Thu, 28 Mar 15:29 UTC	M 1.1 / 1.7 km	13 km	37km S of Packwood, Washington
Mon, 25 Mar
Mon, 25 Mar 17:45 UTC	M 1 / 1.1 km	16 km	22km SSE of Packwood, Washington
Sat, 16 Mar
Sat, 16 Mar 08:10 UTC	M 1.4 / 15.8 km	23 km	20km NE of Goldendale, Washington

Signal Peak is the eroded remnant of a small andesitic stratovolcano overlying the southern part of the basaltic shield of the Lincoln Plateau.
Together with still active Mount Adams volcano to the west and the older Simcoe volcanic field of cinder cones to the east, it is part of a larger volcanic province that has been active for perhaps as much as 5 million years in the area.

Background:

Source:
Geologic Map of the Mount Adams Quadrangle, Washington. Compiled by M.A.Korosec, Washington Division of Geology and Earth Resources Open File Report 87-5 (1987)
Available for download at: www.osti.gov/bridge/index.jsp

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