Get our newsletter!
Check out the volcano tours offered by Volcano-Adventures!
Volcanoes & Earthquakes - new app for Android
Guaranteed tours:
22-29 Apr: Pearl of the Aegean - Santorini - Santorini Island, Greece
13-21 May: From Stromboli to Etna - Eolian Islands + Etna volcano (Italy)
20-27(28) May: Fascination Volcano - Santorini Island (Greece)
29 May - 3 Jun: Aegean's Hidden Gem: Isle of Milos - Milos Island (Greece)
3-18 Jun: From Krakatau to Bali - Java (Indonesia)
4-11 Jun: Nyiragongo Lava Lake & Mountain Gorillas - DR Congo + Rwanda
10-18 Jun: From Stromboli to Etna - Eolian Islands + Etna volcano (Italy)
8-23 Jul: From Krakatau to Bali - Java (Indonesia)
10-14 Jul: Adventure Volcano - Yasur Volcano Travel - Tanna Island (Vanuatu)
10-24 Jul: Volcanoes in the South Sea - Vanuatu (South Sea)
: spaces available / : guaranteed / : few spaces left / : booked out
Random pictures
News

no news in this list.

 

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, 20 Apr
Thu, 20 Apr 20:19 UTCM 1.0 / 15.1 km29 km- 14km SE of Orting, Washington
Thu, 20 Apr 20:12 UTCM 0.9 / 23 km116 km- 23km E of Desert Aire, Washington
Thu, 20 Apr 14:30 UTCM 0.9 / 13.1 km19 km- 22km ENE of Eatonville, Washington
Wed, 19 Apr
Wed, 19 Apr 02:30 UTCM 0.4 / 0.5 km23 km- 22km WNW of Packwood, Washington
Tue, 18 Apr
Tue, 18 Apr 15:37 UTCM 0.8 / 3.8 km22 km- 26km SE of Eatonville, 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.
"


Latest satellite images

 

More on VolcanoDiscovery:

Copyrights: VolcanoDiscovery and other sources as noted.
Use of material: Text and images on this webpage are copyrighted. Further reproduction and use without authorization is not consented. If you need licensing rights for photographs, for example for publications and commercial use, please contact us.