authors hamza reci, safet dogjani, edmond dushi
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THE RELATION OF RADON CONCENTRATION WITH TECTONICS THAT CAUSED THE EARTHQUAKE OF SEPTEMBER 2009, IN GJORICA, WITH MAGNITUDE 5.5. Authors HAMZA RECI, SAFET DOGJANI, EDMOND DUSHI - PowerPoint PPT PresentationTRANSCRIPT
THE RELATION OF RADON CONCENTRATION WITH TECTONICS THAT CAUSED THE
EARTHQUAKE OF SEPTEMBER 2009, IN GJORICA, WITH MAGNITUDE 5.5
Authors HAMZA RECI, SAFET DOGJANI, EDMOND DUSHI
Affiliation: Institute of Geosciences, Energy, Water and Environment, str. Don Bosko, nr.60, Tirana, Albania, e-mail: [email protected]
Outline
• INTRODUCTION
• TECTONIC SETTINGS
• METHODOLOGY AND RESULTS
• CONCLUSION
Authors HAMZA RECI, SAFET DOGJANI, EDMOND DUSHI
Affiliation: Institute of Geosciences, Energy, Water and Environment, str. Don Bosko, nr.60, Tirana, Albania, e-mail: [email protected]
Introduction Rocks enriched in uranium and/or thorium are likely sources of
Radon.• 222Rn, 220Rn and 219Rn (all occurring as gas), stem from the 238U, 232Th,
and 235U decay series, respectively. • 222Rn, has a half life of 3.825 days.
Radon-monitoring applied to earthquake prediction, detection of fault and fractures zones.
• Linear Rn anomalies caused by migration of radon through cracks and openings (Abdoh and Pilkington, 1989).
• This precursor phenomenon is thought to be related strain release in the foreshock sequence that increases the emanation power of the rock due to fracturing.
• Xingtai earthquake (Richter magnitude, M=7.2) in 1966. • Successful prediction of the Haicheng earthquake (M=7.3, on February
4, 1975, north of China).• There is no clear evidence that it is really a good precursor.
Tectonic settings• Seismic activity in the region- related with the active Transversal
Tectonic Fault Vlora-Elbasan-Diber (Naço et al., 2011)• The Okshtuni tectonic window represents a very important node in
tectonic structuring of Albanides
Tectonic Settings
The flysch formation of Mastrihtian- Eocene, builds the central part of Okshtuni anticline, although the youngest age, is tectonically underlain
METHODOLOGY AND RESULTS• On September 06, 2009, local time 23:49, an earthquake with
magnitude Mw=5.5 and epicenter on Gjorica village struck Albania.
The measurements are carried out with the Lukas cell method, using the instrument Luk-4. The air sample were taken in a depth 0.6-0.8 m.
METHODOLY AND RESULTS
• The measurements of in-soil radon concentration were done in two phases, along a profile perpendicular with the cracks present on the surface.
• First phase-day after the mainshock, during the phase of aftershocks.
• Second phase- approximately 8 months after the mainshock, during the seismically quiet phase,
METHODOLOGY AND RESULTS
Fig. 4 Schematic view of in soil measurements of Radon
Concentration on the epicenter zone.
The values of radon concentration on the epicenter zone. Red color one day after
main shocks. Blue color seismically quiet phase (8
months after the mainshock).
CONCLUSION
• The high level of Radon concentration close to the cracks, is explained from the fact that they serve as chimney for its movement.
• The high level of Radon concentration in point 2 comparing to other points, is related to the fact that the measurement was carried out during an aftershock.
• The level or radon concentration 10 times higher close to the surface cracks, is explained from the fact that the rock pores and sedimentary cover are filled with Radon gas, and as a consequence the cover serve as shield that does not allow it to be distributed in atmosphere.
• There is no clear evidence that it is really a good precursor.
THE RELATION OF RADON CONCENTRATION WITH TECTONICS THAT CAUSED THE EARTHQUAKE OF
SEPTEMBER 2009, IN GJORICA, WITH MAGNITUDE 5.5
Authors HAMZA RECI, SAFET DOGJANI, EDMOND DUSHI
Affiliation: Institute of Geosciences, Energy, Water and Environment, str. Don Bosko, nr.60, Tirana, Albania, e-mail: [email protected]