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Figure 5.16 The Cascade Range of the Pacifi c Northwest
Cascade Range
Meager Mountain
A
Juan
de Fuca
Plate
Juan de Fuca
Ridge
Mount St. Helens
Mount Adams
B
North
American
Plate
Pacific
Plate
Lassen Peak
Spreading
Ridge
Subduction
Zone
Mount Adams
Juan de Fuca Ridge
Mount St. Helens
A
B
North
American
Plate
Pacific
Plate
Juan de Fuca
Plate
Lassen Peak in California erupted from 1914
to 1917. This eruption took place in 1915.
b
Plate tectonic setting for the Pacifi c Northwest. Subduction of the Juan
de Fuca plate accounts for ongoing volcanism in the region.
a
Mount St. Helens, Washington. The lateral blast
on May 18, 1980, took place when a bulge on the
volcano's north face collapsed, reducing the pressure
on gas-charged magma.
c
 
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