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This reference provides an introduction to the geoid, the equipotential surface of the Earth's gravity field which best fits global mean sea level. There is a narrative of early attempts to describe the geoid, and schematic diagrams showing the geoid and its relationship to Earth's crust, local mean sea level, orthometric heights, and local dynamic ocean topography.
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In
this
activity,
students
learn
about
the
different
types
of
seismic
waves
in
an
environment
they
can
control.
Using
an
interactive,
online
wave
generator,
they
will
study
P
waves,
S
waves,
Love
waves,
and
Rayleigh
waves,
and
examine
a
combination
of
P
and
S
waves
that
crudely
simulates
the
wave
motion
experienced
during
an
earthquake.
A
tutorial
is
provided
to
show
how
the
wave
generator
is
used.
...
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These animations show students the nature of particle motion in longitudinal and transverse waves, and how they combine to form the more complex motions seen in water waves and Rayleigh surface waves, a type seen in earthquakes. The animations are accompanied by written explanations.
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These
animations
show
how
various
types
of
waves
are
propagated
during
an
earthquake.
Users
can
see
how
P-waves
travel
at
the
surface,
how
they
are
reflected
and
refracted
as
they
travel
further
from
their
source,
and
how
multiple
reflections
can
combine
to
create
a
surface
wave.
There
is
also
an
animation
showing
how
S-waves
were
amplified
by
reflections
from
the
Moho
during
the
1989
Loma
Prieta
...
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This animation shows how P-waves (primary, or compressional, waves) travel through a Slinky toy. It is accompanied by a brief written explanation that describes some of the properties of P-waves and how they are generated in a real Slinky.
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This tutorial instructs students on how to create simulations of P- and S-waves by using simple materials; a Slinky toy and a length of rope.
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This animation shows how S-waves (secondary, or shear, waves) travel through a Slinky toy. It is accompanied by a brief written explanation that describes some of the properties of S-waves and how they are generated in a real Slinky.
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By examining GPS time series plots from stations on opposing sides of the San Andreas Fault, students will determine the relative movement between the two stations. They can then apply this to calculate the time it will take for Los Angeles to reach San Francisco. Background information and necessary equations are provided. There is also a link provided to print out the time series.
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This portal offers access to data on recent earthquakes and volcanic activity in the Pacific Northwest, particularly Washington and Oregon. Materials presented here include catalogs and data from previous earthquakes, including historic events, information on earthquake hazards and research activities of the PNSN, and links to news articles, frequently asked questions, and educational materials.
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The
Geomagnetic
and
Solar
Activity
Forecast
Service
is
a
service
of
the
British
Geological
Survey.
It
provides
data
for
daily
local,
global
and
solar
geomagenetic
activity.
Data
includes
information
projected
up
to
27
days
ahead
using
a
linear
prediction
method,
up
to
3
days
ahead
using
a
non-linear
prediction
method
and
smoothed
monthly
solar
and
geomagnetic
activity
for
the
next
solar
cycle
using
...
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