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Over
a
period
of
50
years
around
1200
B.C.,
all
the
great
Bronze
Age
civilizations
came
to
an
end.
A
number
of
ideas
have
been
advanced
to
explain
why
these
civilizations
ended
almost
simultaneously,
but
no
one
is
quite
sure
why.
This
radio
broadcast
explains
how
a
physicist
at
Stanford
University
has
come
up
with
a
new
idea-
a
series
of
earthquakes,
sweeping
over
southern
Itlay
to
central
Turkey
...
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In
this
lesson,
students
explore
the
causes
of
earthquakes
and
their
impact
on
the
geology
of
an
area
and
on
human
societies.
They
begin
by
looking
at
the
role
tectonic
plates
play
in
creating
the
forces
that
cause
earthquakes,
to
help
them
understand
why
earthquakes
occur
when
and
where
they
do.
Hands-on
activities
illustrate
how
rocks
can
withstand
a
certain
amount
of
stress,
but
that
every
material
...
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In
this
activity,
students
use
online
resources
to
investigate
the
occurrence
of
earthquakes
in
Southern
California
to
decide
if
there
has
been
a
'deficit',
that
is,
not
enough
earthquakes
in
the
area
in
historical
time
to
release
the
amount
of
strain
energy
that
plate
tectonics
is
constantly
supplying
to
the
crust.
In
the
first
two
parts,
they
must
determine
the
appropriate
year
to
begin
their
study
...
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This article describes the theory of plate tectonics and its relation to earthquakes and seismic zones. Materials include an overview of plate tectonics, a description of Earth's crustal plates and their motions, and descriptions of the four types of seismic zones.
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Choosing & Using this resource...
Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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In this activity, students investigate the distribution of large earthquakes (magnitude greater than 6) in Southern California. Using online maps of earthquake epicenters in Southern California and the Los Angeles Basin, they will compare these distributions with historic distributions (1932-1996), and with respect to the locations of major fault traces.
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Users can access images from historic earthquakes by choosing the name of the earthquake from an alphabetical listing. The images are available in three resolutions and are accompanied by brief written descriptions.
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Examples of use
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This
map
of
world
seismicity
illustrates
earthquake
data
for
the
years
1991
through
1996.
It
is
intended
to
provide
a
sense
of
the
depth
distribution
of
earthquakes.
Plate
boundaries
are
shown,
along
with
diffuse
regions
of
seismicity,
such
as
in
central
Asia,
and
earthquake
locations
are
color-coded
to
indicate
the
depths
at
which
they
occurred.
In
addition
to
the
map,
selected
cross-sections
of
...
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According
to
theory
of
plate
tectonics,
Earth
is
an
active
planet
--
its
surface
is
composed
of
many
individual
plates
that
move
and
interact,
constantly
changing
and
reshaping
Earth's
outer
layer.
Volcanoes
and
earthquakes
both
result
from
the
movement
of
tectonic
plates.
This
interactive
feature
shows
the
relationship
between
earthquakes
and
volcanoes
and
the
boundaries
of
tectonic
plates.
By
clicking
...
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This page consists of two maps of the world, showing how earthquakes define the boundaries of tectonic plates. Volcanoes are also distributed at plate boundaries (the "Ring of Fire" in the Pacific) and at oceanic ridges. It is part of the U.S. Geological Survey's Cascades Volcano Observatory website, which features written material, images, maps, and links to related topics.
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Geologic
features
altered
by
earthquakes
provide
striking
evidence
of
the
power
of
seismic
events.
This
video
segment
explores
the
research
of
Dr.
Kerry
Sieh,
a
geologist
at
the
California
Institute
of
Technology,
who
is
dating
sediment
layers
broken
and
offset
by
earthquakes
in
the
past
to
determine
the
rate
at
which
strain
is
accumulating
towards
the
next
event.
The
segment
is
three
minutes
nineteen
...
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Choosing & Using this resource...
Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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