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Passive and active seismic surveys for site investigation in Bucharest using seismographs dense array: preliminary results

Authors

Tolea,  Andreea
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Grecu,  Bogdan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tataru,  Dragos
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zaharia,  Bogdan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Necula,  Eduard
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Tiganescu,  Alexandru
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Neagoe,  Cristian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Nastase,  Eduard Ilie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dinescu,  Raluca
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Tolea, A., Grecu, B., Tataru, D., Zaharia, B., Necula, E., Tiganescu, A., Neagoe, C., Nastase, E. I., Dinescu, R. (2023): Passive and active seismic surveys for site investigation in Bucharest using seismographs dense array: preliminary results, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4008


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5019835
Abstract
This work presents a preliminary study focused on a site characterization conducted in the Bucharest area using a dense temporary seismic array. The aim is to obtain a more in-depth understanding of the subsurface velocity structure at the location of a seismic station that is a part of the Romanian Seismic Network (RSN), and located in the wider central region of Bucharest, at Cutitul de Argint. The seismic data were collected using 15 newly released Atom-3C wireless seismographs. The Atom-3C seismograph is a turnkey solution for assessing subsurface conditions, much quicker than traditional land seismic surveys, requiring no spread cables. It has separate acquisition units with 24-bit A/D conversion, GPS-controlled timing, 4 GB of internal data storage, a configurable sample rate and batteries that can last up to 70 hours before they need to be recharged. The seismic surveys were performed adopting different array geometries, such as an L-shaped array for microtremor array measurements (MAM) and a linear array for multichannel analysis of surface waves (MASW). We show some preliminary results in terms of the shear wave velocity (Vs) structure for each active and passive survey, and for the combination of active and passive survey data along the linear configuration of the array.