Geology Reference
In-Depth Information
long time is required for a point at (46.9
ı
N,
129.4
ı
W) along the ridge to enter the Casca-
dia Trench and what is the predicted location
of ridge subduction?
6. Subduction of the Capricorn plate beneath
Sundaland along the Sumatra Trench is
highly oblique. Strike-slip motion along
the Sumatran Fault, which is parallel to
the trench in the forearc region, determines
partitioning of such oblique subduction into
a trench-normal component and a trench-
parallel component. Determine the slip rate
and the sense of shear along the Sumatran
Fault at (2.5
ı
S, 101.5
ı
E);
7. The Periadriatic Line in northern Italy and
Croatia is a wide E-W and NW-SE structure
that accommodated strike-slip motion be-
tween Africa and Europe in the geologic past
(see figure). What would be the style of this
fault at (46.4
ı
N, 11
ı
E) and (42.8
ı
N, 17.8
ı
E)
if it were a present day plate boundary?
Problems
1. An Eulerian reference frame is a geocentric
reference frame obtained rotating an Euler
pole to the North pole. Determine the equa-
tion of transformation from geographic to
Eulerian latitude;
2. The number of edges in a circuit with
p
plates
is always
e
D
p
1. Explain why;
3. Show that the relation
e
D
p
1 is compatible
with (
2.34
),
e
and
p
being the number of
edges and the number of plates in a circuit;
4. Given the three-plates system formed by the
Pacific, North American, and Juan de Fuca
plates, determine the relative velocity vector
of Juan de Fuca with respect to N. America
at (46.5
ı
N, 125.8
ı
W) using the data in Ta-
ble
2.5
;
5. Assuming that the spreading asymmetry is
zero along the Juan de Fuca Ridge, how
8. Anatolia is a small microplate between Ara-
bia and Europe in the eastern Mediterranean,
whose N and SE boundaries are transcur-
rent faults (see figure). Starting from the
relative velocity of Arabia with respect to
Europe, calculate the westward escape ve-
locity of this microplate along its strike-slip
boundaries;
