The Smallest Mountain Range in the World
Rising almost 2,000 feet above the flat agricultural fields of the Great Valley of central California, the Sutter Buttes present a striking contrast to the land around them in this photo taken by an astronaut aboard the International Space Station on July 29.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 Sep 5, 2012
Like that one.
This is the 3rd volcano of the "Gorda" arc adjacent to the Cascadia subduction zone and formed in response to the subduction of the Gorda plate under Northern California.
It is now being occluded by the Cascadia subduction zone which is advancing W. via gradual jogs and spreading of the Basin & range hotspot driven backarc basin.
The bulk of the magma now erupts @ Lassen peak & adjacent lassen volcaniic field cinder cone field,(NE, part of the arc at the intersection with the cacadia subduction zone. but Clear lake volcano in the coast range of northern california is trapped in transform fault segments and is therefore still active (ie. holding hot magma), with magma filled fractures in the base of the crust there being squeezed into the central portion of the segment directly under the volcano. Magma input volume @ Clear lake is now small, but enough to keep the central pluton nice & hot.
Volcanoes also exist in the Gorda backarc basin, particularly in the backarc rift (Owens valley), hosting the Long valley supervolcano (~1000Km3) and the advancing Mono craters pluton (mono lake-inyo craters volcano chain) which is likely to erupt ~1100Km3 when it finally breaches the surface. Full rift extends from Lake Tahoe Geysers region down to Coso lava dome chain. Also note Ubehebe craters in a backarc basin rift, and also interior california desert volcanoes and California borders volcanoes adjacent to the basin & range.
In the case of the Gorda backarc basin the bulk of the magma goes to the middle.
Currently not found any cases of earthquake & uplift studies of Gorda sector of Cascadia near Mendocino/Petrolia region, so megathrust quake frequency here is difficult to decipher from the nearest North California study site.
have a nice day: Ag
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