Seismic waves are waves of energy that travel through the Earth's layers, and are
a result of ... Other modes of wave propagation exist than those described in this
article; ... S-waves are slow...
Although earthquakes produce several different types of waves, we will focus (no
pun intended) on two. ... It is important to understand the differences between
these two waves. ... Travel slower, and arrive at seismic stations second. ... P
waves travel faster than S waves, and will always arrive at a seismic station first.
These are the waves that do the most damage to our buildings, highways, etc. ...
To apply those ideas to earthquake studies, think of the earthquake location as
the ... Secondary , or S waves, travel slower than P waves and are also called ...
the time that earthquake rupture initiated (called the "origin time") into the
We now understand that these plates have motion. Thanks to a ... Hess knew that
people would then ask, “well, isn't Earth gonna get huge?” Hess ... The point of
which the wave originates is what we call the Earthquake focus (foci plural). ...
Plate tectonics is one of those topics that you generally skim through in junior
www.ucl.ac.uk/EarthSci/people/lidunka/GEOL2014/Geophysics4 - Seismic waves/SEISMOLOGY .htm
Surface waves are larger in amplitude and longer in duration than body waves.
These waves arrive at seismograph after the arrival of P- and S-waves because
of ... Love waves (named for A.E.H. Love, who discovered them) travel by a
transverse ..... All is not lost since reflection seismology could detect the slower
As shown in Figure 1, the point on the surface directly above the focus is ... Each
of these waves travel at different velocities (speeds), even though they are
generated simultaneously by an earthquake at the focus (point of origin within the
crust). Since P-waves travel faster than S-waves do, the seismograph will detect ...
Where these plates interact, major geological processes take place, such as the
... Areas characterized by relatively slow wave velocities represent hotter material
... In contrast to the Moho, this boundary is thermal in origin, rather than chemical.
.... In this section we focus on two types of hazards, earthquakes and volcanoes, ...
It is these seismic waves that can produce ground motion which people call an
earthquake. ... S waves are slower and travel between 3.5 and 7.5 km/sec. ... The
actual records of earthquake waves are far more complicated than what is ...
used to determine the distance the waves have traveled from the origin to that
Origin of Earthquakes ... These bends disappeared after an earthquake
suggesting that the energy stored in bending the rocks was suddenly ... The
epicenter is the point on the surface of the Earth directly above the focus. ... Note
that S-waves travel slower than P-waves, so they will reach a seismograph after