1. Tectonic geomorphologic investigation of Marcal basin
Judit Gál , Dept. of Physical Geography, Eötvös Loránd University, Budapest, Hungary
Lénárd Pál, Dept. of Geophysics and Space Sciences, Eötvös Loránd University, Budapest, Hungary
Supervisors: Gábor Kovács ,
Dept. of Geophysics and Space Sciences, Eötvös Loránd University, Budapest, Hungary
Dept. of Physical Geography, Eötvös Loránd University, Budapest, Hungary
András Zámolyi,
Dept. of Geodynamics and Sedimentology, University of Vienna, Austria
Meeting of Young Geoscientists
Győr, 2011 1

2. Study area, general conditions
Demonstrable vertical movement- particularly Bakony Hills
Marcal-basin: denudation semibasin
mm/year 2

3. Marcal-basin Dense surface water system (precipitation 800 mm/y)
Sanded, impermeable, clayely, marly strata alternation
Asimmetric basin, uplifting of Bakony Hills right-bank tributaries are longer, than the left bank brooks (good base to the study) 3

4. Main objectives Tectonic geomorphologic investigation: Method:
neotectonic process
demonstrable boundary of the uplifting and subsiding zones
Method:
Sinuosity
Seismic profiles, borehole data
Earthquake data
Geophysical measurements (VESZ) 4

5. Sinuosity runoff Bend development Influencing factors:
slope of river-bed (tectonics)
runoff
wash content, quantity
Development (Schumm, 1963):
S= development
dmeder= channel lenght between A-B
dlégvonal= distance between A-B A B 5

6. Second military survey (1806-1869)
triangulation
geodetic base
nearly natural,
unmodified state 6

7. Evaluation-Marcal 4 sections: Section 1: 1-1.3 sinuosity
Sinuosity of Marcal
Sinuosity of Marcal
4 sections:
Section 1: sinuosity
Section 2: descending: 1.1
50th km: 1.2 stagnant
Section 3: 71st km 1.1
80th km 1.9! (fault?) abrupt increase
Section 4: Abrupt descending 7
Forrástól mért távolság (m)
Distance from spring-head (m)

8. Distance from spring-head (m)
Evaluation-Bitva
Sinousity of Bitva
Distance from spring-head (m)
Section 1: 1.4 high value
Section 2: Stagnant up to 17th km
Section 3: 1.2 twice between 18th km and 23rd km
Section 4: ~ 8

9. Distance from spring-head (m)
Evaluation-Hajagos
Sinuosity of Hajagos
Distance from spring-head (m)
Section 1: high values (first 14 km)  correlation with the first kilometers of Bitva
Section 2: stagnant up to 25th km
Section 3: 4 top points: 1.2 9

10. Designation of the study area done by streams are seems to be available
to provide some information about the development and tectonic geomorphology 10

11. Seismic interpretation
Telegdi-Róth line 11

12. Detachment fault in the basement
Fault relate to weakness zone uncertain fault-outcropping 12

13. 13

14. Faults can see due to breaking of reflections
Triassic detachment faults
Weakness zones
Faults can see due to breaking of reflections 14

15. 15

16. Faults, fault-structures
Detachment faults
Weakness zones
Faults, fault-structures 16

17. 17

18. Two types of detachment faults Telegdi-Róth fault zone
Faults, flower-structures
Senonian synrift 18

19. 19

20. 20

21. Earthquakes Research area: 7 smaller (3-5 EMS) earthquakes (GeoRisk)
Hipocentrum: shallow (7-13 km)
The hipocentrum of the earthquakes in the basement refer to neotectonic activity 21

22. VES Selecting the tectonical active places
The possible cropping out places of faults was measured with surface geophysics (VES)
Outcropping places
Telegdi-Róth outcropping places
High sinousity value; Hajagos
High sinousity value; Bitva 22

23. MG5
MG4
MG3
MG2
MG1
The upper layer with higher apparent resistivity correlate with the topography 23

24. EG3
EG2
EG1
EG5
EG4 24

25. Summary
Relationship between the sinousity values and near-surface faults
The Telegdi-Róth line, recent fault-structures, hipotesis of fault plane
The uplifitng and the subsiding are not happening in a well-determined line
Results of the integrated investigations: neotectonic activity
Further study: shallow geophysical measurements, geological map correlation
Outcropping places
Telegdi-Róth outcropping places
High sinousity value;Hajagos creek 25
High sinousity value; Bitva creek