2. Magnetic anomalies of the Bakony-Balaton- highland volcanoes 2
Aim of project
Magnetic anomalies of the Bakony-Balaton- highland volcanoes
Magnetic measurements on the Lake Balaton
Data processing
Comparing the magnetic and seismic data
Modeling basalt volcanoes
Conclusions

3. To carry out magnetic measurements on the eastern part of the Lake3
To carry out magnetic measurements on the eastern part of the Lake
Verification seismic interpretation with magnetic measurements and modeling

4. High resolution and ultra-high resolution seismic sections showing magmatic intrusions4

5. 5
Sacchi (2001)

6. P30 6

7. Bal4 7

8. Seistec 2000_301 8
200 m

9. Seistec 2000_501 9
200 m

10. Volcanology of the Bakony – Balaton-highland volcanic fied10
The Bakony – Balaton-highland volcanic field with the basalt outcrops encircled

11. Sediment filled craters11
Basalt capped buttes
Sediment filled craters

12. Primarily basalt tuffs and pyroclastics 12
Monks’ dwellings
Geological map of the Tihany Peninsula (Lóczy Lajos, 1920)
Primarily basalt tuffs and pyroclastics
Basalt bombs and blocks in the wall of the „Monks’ dwellings”

13. Map of magnetic Δz anomaly of Balaton-highland (ELGI, 2006)13
Map of magnetic Δz anomaly of Balaton-highland (ELGI, 2006)

14. Normal and reverse magnetization
Dipole field 14
Magnetic anomaly of a normal dipole
Magnetic anomaly of a reverse dipole

15. 15
ELGI (2006)
Reverse
Combined
Normal

16. The measurements resulted North-South sections of a total of 140 km16
The measurements resulted North-South sections of a total of 140 km

17. Magnetic measurements: Sept. 06-10, 201017
Measuring of the total magnetic field with a GSM-19 proton precession magnetometer
The magnetometer was fixed in vertical position
Wooden boat with the magnetometer trawling behind the motorboat
Navigation by hand-held GPS

18. 1. Correction of temporal variation
Data processing
1. Correction of temporal variation 18
The measured intensities corrected for temporal variation based on data from the Tihany Geomagnetic Observatory nT

19. Data processing 2. Normal correction19
The spatial variation of the magnetic field was extracted from our data:
Tθ(θ=45°) ≈ nT/km nT

20. Data processing
3. Reduction to pole 20 nT

21. 21

22. 22
110221
Bal-12
ÉNY
ÉNy DK DK

23. 23
Bal-12 ÉK
DNY
after Horváth et al. (2010)

24. Volume of the basalt body 3681554 m3 Susceptibility κ=0,001695 24
Parameters
Depth of the dipole
300 m
Volume of the basalt body m3
Susceptibility
κ=0,001695
Remanent magnetization
3,772 A/m
Remanent inclination
-56º
Remanent declination
187º
Total intensity
48000 nT
Inclination
63,5º
Declination
2,9º

25. 25
2 km
Based on ELGI (2006)

26. Based on the Tihany samples the remanent magnetization was ignored 26
Based on the Tihany samples the remanent magnetization was ignored
For calculating induced magnetism the susceptibility of the Tihany samples were taken as reference
Map of magnetic anomaly reduced to the pole

27. Volume of the basalt bodies 14075142 m3 Susceptibility 0,004931895 27
Parameters
Depth of dipole
300 m
Volume of the basalt bodies m3
Susceptibility 0,
Total intensity
48000 nT

28. 28
[T] nT
1 km

29. Interactive Gravity and Magnetic Application System (Götze, 1978)29
Interactive Gravity and Magnetic Application System
(Götze, 1978)
Bal-12

30. 30
after Horváth et al. (2010)

31. 31
110m
280 m
180m

32. 32

33. 33
Magnetic anomalies in the Balaton-highland are related to basaltic intrusions with normal, reversed and combined magnetization
Understanding the complex anomaly pattern would require further magnetic surveys, rock magnetic and volcanological studies
Preliminary magnetic surveys combined with high resolution seismics demonstrate the presence of volcanic intrusions below the Lake Balaton
Further research can shed new light on the Mio- Pliocene volcanism of the Bakony – Balaton- highland

34. Dombrádi Endre
Horváth Ferenc
Kovács Gábor
Lenkey László
Márton Péter and Mártonné Szalay Emő
Németh Kriszta, Dósa Melinda
Pethe Mihály
Visnovitz Ferenc

36. Magnetic anomalies in the Balaton-highland are related to basaltic intrusions with normal, reversen and combined magnetization
Understanding the complex anomaly pattern would require further magnetic surveys, rock magnetic and volcanological studies
Preliminary magnetic surveys combined with high resolution seismics demonstrae the presence of volcanic intrusions belw the Lake Balaton
Further research can shed new light on the Mio- Pliocene volcanism of the Bakony – Balaton- highland