First International Conference on MOLDAVIAN RISKS – FROM ...

11.12.2012 Views
ong>Firstong> ong>Internationalong> ong>Conferenceong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania VRANCEA ZONE IN THE FRAME OF GLOBAL SEISMICITY Ilie Sandu Institute of Geology and Seismology, Acasemy of Science of Moldova Corresponding author: Ilie Sandu, ilie_sandu@yahoo.com Abstract: Regional investigation of Vrancea area seismicity, as well as quantitative estimates of intake in the global seismicity has been done in the frame of ong>Internationalong> Seismic Catalogue (ISC) report’s database. The global seismicity has been filtered according: magnitude (M≥4.5), depth (1000≥H≥0km), time (1965-2008), and regional events specify the area framed by coordinate limits of: 48º≥λ≥44º and 29º≥φ≥24º further. Using recurrence relations of different scales: M (magnitude), M0 (seismic moment), E (energy), the coefficients of seismic frecvency-power distributions were obtained statistically (at global and regional scale). The regional to global seismic activity rate KR/G=1:1500 (from global: EG≈1.7×10 19 J, during 44 years range, or PG=13±4GW), one of the high density tectonic power release of the Globe. Key words: Vrancea seismicity, global statistics, power. 28

ong>Firstong> ong>Internationalong> ong>Conferenceong> on MOLDAVIAN RISKS - FROM GLOBAL TO LOCAL SCALE 16-19 May 2012, Bacau, Romania WATER INDUCED GEOHAZARDS MEASURED WITH SPACEBORNE INTERFEROMETRY TECHNIQUES F. Serban 1 , M. Radu 2 , D. Teleaga 1 , M. Sorin 3 1 Advanced Studies and Research Center, Bucharest 2 CONVERSMIN, Bucharest 3 INCDMRR, Bucharest Corresponding author: F. Serban, florin.serban@asrc.ro Abstract: Spaceborne interferometry techniques combined with ground data permit estimation of the rocks mechanical properties and the development of models and scenarios to predict disaster events such as cave-ins, landslides or soil liquefaction in the case of an earthquake. The DInSAR (Differential Interferometric Synthetic Aperture Radar), Interferograms Stacking and PSI (Persistent Scatterers Interferometry) techniques have been applied to retrieve the displacement information as accurate as possible on three sites in Romania, which suffer of ground instability caused by the water component. The first site is composed of 4 tailing retention ponds at different stages of their life located in Bucovina. The tailing ponds are hydrotechnical structures of permeable type designed for the safe deposit of mining detritus byproducts and disposal of the water contained in these byproducts. Since 1998 some 550 mines have been closed and introduced in a conservation process all over the country. In order to prevent ecological and human damages, all these mines and storage ponds for mining tailings are required to be under continuous monitoring. Using 15 high-resolution Spotlight TerraSAR-X images, the stability of the storage pond was monitored over a five-month period during 2011. Interferometric stacking and PSI were applied in order to generate deformation maps and deformation profiles. At the same time, GPS measurements and Electrical Tomography for water content were used as independent measurements. The second site is Ocnele Mari brine extraction area. The extraction of salt through dissolution led to slow ground subsidence but the flooding and dissolution of the Roman caves led to catastrophic cave-ins and the relocation of an entire village. The ground deformation is presently measured with leveling instrumentation and steps are being made to adopt the interferometric results for a better spatial and temporal coverage that should refine the existing measurement model. The third site is the City of Bucharest. Using ERS data collected over 7 years, ground instability was detected on a large area that represents the historical watershed of the Dambovita river. A network of water wells shows that the ground instability is directly proportional to the groundwater depth. The sites that were analyzed and presented reveal important information which can also benefit some other risk areas in Moldova, such as mining sites (Targu Ocna, Cacica) and urban areas. Key words: spaceborne interferometry, DInSAR, PSI, ground instability. 29

Page 1: “VASILE ALECSANDRI” UNIVERSITY

Page 4 and 5: Editors: Mioara Mandea, Gabriel Laz

Page 7 and 8: First Inte










Page 27: First Inte









































Page 111 and 112: Sponsors of the conference Sodexo P

bacau

romania

risks

water

global

international

scale

moldavian

university

conference

mrconference.ub.ro

First International Conference on MOLDAVIAN RISKS – FROM ...

First International Conference on MOLDAVIAN RISKS – FROM ... ... View more First International Conference on MOLDAVIAN RISKS – FROM ...

Delete template?

Save as template ?

First International Conference on MOLDAVIAN RISKS – FROM ... First International Conference on MOLDAVIAN RISKS – FROM ...