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Simcoe volcano

volcanic field
Washington, USA (mainland exept Alaska), 46.1°N / -120.9°W
Current status: (probably) extinct (0 out of 5)
Simcoe volcano books
Typical eruption style: Explosive
Simcoe volcano eruptions: ca. 5-1 million years ago (Lincoln Plateau & Signal Peak: 1-0.5 million years ago)
TimeMag. / DepthDistanceLocation
Thu, 22 Jun
Thu, 22 Jun 20:53 UTCM 1.4 / 1 km55 kmExplosion - 13km NW of Tieton, Washington
Tue, 20 Jun
Tue, 20 Jun 07:04 UTCM 0.7 / 0.2 km120 km- 12km SW of Royal City, Washington
Mon, 19 Jun
Mon, 19 Jun 23:40 UTCM 1.6 / 1.1 km22 kmExplosion - Oregon
Mon, 19 Jun 22:57 UTCM 1.1 / 9.8 km11 km- 27km E of Eatonville, Washington
Sun, 18 Jun
Sun, 18 Jun 07:38 UTCM 2.2 / 5.4 km20 km- 12km NNE of Packwood, Washington
View all recent quakes
Simco volcanic field is a N-S aligned cluster of 24 monogenetic cinder cones. It is located E and SE of Mt Adams, Washington, California, near the town of Goldendale.
Associated is the younger basaltic Lincoln Plateau with Signal Peak at the western end of the field and east of Adams. It was formed by a shield volcano active until about half a million years ago.

Background:

From: Wood and Kienle, (eds.), 1990, Volcanoes of North America - United States and Canada: Cambridge University Press.
cited on CVO website(USGS Cascades Volcano Observatory)
"
East and southeast of Mount Adams, extending south to the town of Goldendale, is a broad expanse of folded and faulted basalt that is little known. A north-south line of around 24 cinder cones crosses the center of the field, and south of the 46th parallel another dozen cones extend the line to the southeast. The oldest units are thick flows of rhyolite in the eastern Simcoe Mountains. These are contemporaneous with pyroxene-olivine basalt and olivine basalt of the Simcoe Mountains. The pyroxene-olivine basalt forms short, 6-10-meter-thick flows, whereas the olivine basalts are 1-6-meter-thick flows, extruded from small shields and cinder cones. A few of the above units are dated at 4.5 to 0.9 million years ago.
East of Mount Adams are a shield volcano and the lava flows forming Lincoln Plateau; all are olivine basalt probably younger than 0.9 million years. Perhaps the youngest unit of this volcanic field is the dacite that forms Signal Peak, east of Mount Adams, that is believed to be 1.0-0.5 million years.
"


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