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Is it possible to predict earthquakes using a TM-71?. Xavi Marti. 1862 (AMR 1856). www.igs4.com +34 977 840 444. What is the Poisson ratio of the Earth ?. 1862 (AMR 1856). http://en.wikipedia.org/wiki/Earth_tide. 1862 (AMR 1856). Image courtesy of J. Gazquez. - PowerPoint PPT Presentation
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1862
(AMR 1856)
Is it possible to predict earthquakes using a TM-71?
Xavi Marti
www.igs4.com+34 977 840 444
http://en.wikipedia.org/wiki/Earth_tide
What is the Poisson ratio of the Earth?
1862
(AMR 1856)
1862
(AMR 1856)
Image courtesy of J. Gazquez
Image courtesy of J. Gazquez
Image courtesy of J. Gazquez
Image courtesy of J. Gazquez
Josef Stemberk, Matthew Rowberry, et al.
Matthew RowberryPusty Zlebska, CZ
Inventor: Dr. Košták
Inventor: Dr. Košták
Inventor: Dr. Košták
1
2
1 2
Inventor: Dr. Košták
http://www.tecnet.cz/index.php?page=view_online_img_en&id=117
Automatic data processing
image1.jpg
9.08158 5.07471
-180 -90 0 90 180 -180 -90 0 90 180
Mesurable semidiurnal oscillation
3 3.2 3.4 3.6 3.8 4-1.5
-1
-0.5
0
0.5
1x 10
-11 Theory
3 3.2 3.4 3.6 3.8 4-0.02
-0.01
0
0.01
0.02Experiment
Time (days)
z
Astronomical & geophysical model
Astronomical & geophysical model
TEM Image courtesy of J. Gazquez
Elastic energy monitoring
grad[Vtidal(t)] = Km*d2/dt2 (z1-z2)|t + grad [other forces]
kakb
Mesurable semidiurnal oscillation
3 3.2 3.4 3.6 3.8 4-1.5
-1
-0.5
0
0.5
1x 10
-11 Theory
3 3.2 3.4 3.6 3.8 4-0.02
-0.01
0
0.01
0.02Experiment
Time (days)
z
0 1 2 3 4 5
-10
0
10
Sig
nal (
a.u.
)Time (days)
input, gravity tidal field
0 1 2 3 4 5
20
40
60
80
100
|A|
Frequency (days)
0 1 2 3 4 5-20
-10
0
10
20
Sig
nal (
a.u.
)
Time (days)
output, measurement
0 1 2 3 4 50
50
100
150
|A|
Frequency (days)
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
1
2
3
Out
put/
Inpu
t
Protocol: 1) Slide-slice data in periods of ~5 days2) Extract only contributions of 1 and 2 days (filter)3) Monitor the changes in the “ratio” (transfer function)
Important remarks
1. We need time dependence to real time monitor the changes in elastic energy. Without time-dependent tidal effects we wouldn’t no monitor elastic (or any) changes. Sismographs arrive late!
2. We need angular resolved (TM71) information because tidal potentials are vectorial
3. Also, because I cannot see any other way to get Z-information, which is in particular the direction showing largest changes
We are unique
