Oregon has a large number of volcanoes in addition to
the major volcanoes of the Cascade
Mountains. The volcanoes in the following view were mapped using a volcano
icon from a list
of icons provided with Google Earth.
map includes both uneroded and eroded volcanic features. Oregon probably
even greater numbers of volcanoes in the past but many have simply been eroded
covered by later deposits.
The northern grouping of Oregon volcanoes follows the
main line of the Cascade mountains.
a closer view of the northern portion of the distribution of volcanoes in Oregon
The southern grouping of Oregon volcanoes
follows the main line of the Cascade mountains.
a closer view of the southern portion of the distribution of volcanoes in Oregon
The central distribution of Oregon volcanoes follows roughly a south-east trend
a close view of the central portion of the distribution of volcanoes in Oregon
Circular features in Oregon were also mapped using the measuring tool that
accompanies Google Earth.
The line segments in this view were given a green color. The source of
these circular patterns is still not
fully explained at present but is probably due to igneous and tectonic activity.
indicated by "Indian"
is an archaeological site with large pictographs.
distribution of circular features in Oregon
Different types of features can easily be included on
the same Google Earth view. The features are all
stored on kml files and can added to or be depleted. Many circles are
found along the Cascade Mountains
line along with the volcanoes. The large number of circula features in the
northeastern section does not
correlate with volcanoes but is an area of abundant hot springs.
volcanoes and circular features in Oregon
In the following view, North is to the right. The map was turned sideways
to better fit the diagonal
shape of the view. Only the major volcanoes of the Cascades are marked
with icons. The small circular
features, most which are actually small volcanoes, closely follow the main line
of the Cascade Mountains.
volcanoes and circular features along the Cascade Mountains
Extensive mapping of both linear features and drainage patterns was done for
most of Oregon.
Heavy vegetation cover East of the Cascades Mountains prevent the mapping of
features in this area.
Thousands of lines were used to create this map. The significance of the
project can only be appreciated
by zooming in closer on specific areas.
linears and drainage patterns in Oregon
Three large circular features stand out in the following view. The
circles were determined primarily by
alignment of linear features and by the termination of linear features.
The largest two circular features
have diameters of 28 kilometers and 26 kilometers.
a close view of linear and circular features
Here is another view of large circular features indicated by linears stuctures.
The diameters of the
three largest circles are 53 kilometers, 35 kilometers, and 34 kilometers.
a close view of linear and
Again, various types of features can be combined in a single map: linear
features, circles and volcanoes.
Together, these features nicely identify a large double ring structure.
a close view with linears,
circles and volcanoes
An additional feature that can be added to these maps is color. Most of
eastern Oregon is a dull gray
color. Occasionally there are brightly colored patches of red, orange, and
yellow iron oxides produced by
the oxidation of iron minerals. In the southeast corner of Oregon there is
a large circular fearure that
extends into suurounding states. This double-ringed circular features is
nicely marked by colored patches
of iron oxides. Also in this view are two smaller circular features
emphasized by strongly colored patches
of iron oxides.
view of the southeast corner of Oregon
The following shows the distribution of hot springs in Oregon.
By combing both hot spings
and volcanoes, one can areas of both correlation and no correlation.
volcanoes and hot springs
While searching for circular patterns in Oregon, I came across several strange
spiral patterns. This
view contains just two of the features. Research confirmed that these are
archaeological artifacts that
have not been dated, very large pictographs. The area is next to Fluke lake
where there are many much
smaller carvings of a similar pattern on rocks. The size of these features
Fluke lake pictographs
Just credit photos to Google Earth/R.Weller/Cochise College.