UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2022-07-01 16:26

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Conference: Bucharest University Faculty of Physics 2019 Meeting


Section: Atmosphere and Earth Science; Environment Protection


Title:
GPS processing tools for better impact assessment of earthquakes in Romania


Authors:
Eduard NASTASE(1)(2), Alexandra MUNTEAN(1), Sorin NISTOR(3), Bogdan GRECU(1), Dragos TATARU(1)


*
Affiliation:
1) National Institute for Earth Physics, PO BOX MG2, 077125, Magurele, Romania

2) University of Bucharest, Department of Geophysics, 6 Traian Vuia St, 020956 Bucharest,Romania

3) Department of Cadastre-Architecture, University of Oradea,Oradea, Romania


E-mail
eduard_nastase@infp.ro


Keywords:
GNSS, high-frequencies, GPS seismology, VADASE


Abstract:
National Institute for Earth Physics operates a regional GNSS reference network for monitoring the Carpathian-Danubian-Pontic area deformations and the impact of local earthquakes. Nowadays, advances in GNSS receivers technology and computational algorithms such as 1Hz acquisition rate (and even more, up to 50Hz), that are commonly available, make us search worldwide for systems & algorithms that would make possible a real‐time estimation of waveforms and coseismic displacements. Thus, we could support, improve and further analyze the results from the collocated velocity & accelerometers seismic sensors, particularly atmospheric, magnetic, infrasound, tilt and/or seismic array sensors. The present paper highlights the results obtained in recent years by looking for the first time from another perspective at the Romanian GNSS data over 3 different study cases, following the implementation of the new generation of tools into GNSS permanent reference network data processing or additional colocated sensors, such as tiltmeters, in help for a more accurate assessment of the Vrancea earthquakes impact. So-called VADASE (Variometric Approach for Displacements Analysis Stand‐alone Engine) does not require either additional technological complexity or a centralized data analysis. Basically, it can be embedded into GNSS receiver firmware, thereby providing a significant contribution to tsunami warning and other hazard assessment systems.


Acknowledgement:
This paper was carried out within Nucleu Program MULTIRISC, supported by MCI, project no PN19080201 and by a grant of the Romanian National Authority for Scientific Research, CNCS/CCCDI-UEFISCDI, project number PN-III-P1-1.2-PCCDI-2017-0266, Contract No. 16PCCDI/2018.With the help and support of Leica Geosystem and Topgeocart Company, 5 demo licences were installed on our Leica GR10 & 30 receivers during the spring of 2018 and the system will be fully operational again on 7 stations starting from 2019.