Geoscience Reference
In-Depth Information
WETTZELL
5
Vertical displ.
0
−5
−10
East displ.
−15
−20
−25
10
−1
10
0
10
1
10
2
10
3
Frequency (cpy)
F
OR
T
L
E
Z
A
5
Vertical displ.
0
−5
−10
East displ.
−15
−20
−25
10
−1
10
0
10
1
10
2
10
3
Frequency (cpy)
Fig. 4
Amplitude spectra of the displacements in vertical and east directions at stations Wettzell
(Germany) and Fortaleza (Brazil). The amplitude of the east direction is translated by log (10
5
)
The displacements at Fortaleza are typical for coastal and lower latitude sites. The
magnitude of the variations is fairly low due to smaller pressure fluctuation near
the equator. Because of the IB effects, the magnitude of APL effects is also fur-
ther reduced by the site's proximity to the Atlantic Ocean. The displacements at a
mid-latitude and non-coastal site (Wettzell) indicate large vertical variations with
amplitudes in the order of 5-15mm. The horizontal displacements are subjected to
similar temporal variations with magnitudes of approximately three times smaller
than those of the vertical displacements (not shown here).
