Dragos Toma-Danila

Dragos Toma-Danila
National Institute for Earth Physics · Laboratory of Engineering Seismology

Researcher, PhD

About

78
Publications
18,329
Reads
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334
Citations
Education
October 2013 - September 2018
Faculty of Geography, University of Bucharest
Field of study
  • Geography
October 2009 - July 2011
Faculty of Geography, University of Bucharest
Field of study
  • Geography

Network

Cited By

Projects

Projects (7)
Project
Increased visibility and access to multi-disciplinary interoperable data, available at national and international level. Develop and implement modern informatic tools facilitating standardisation, integration and access to large volumes of data. Coordinate and operate a distributed infrastructure capable of providing services, facilitate new research and lead to the development of new products based on these.
Project
Enhance preparedness to a major earthquake from a scientific point of view, by analyzing how new technologies could help us better understand the phenomenon and its impact on society. In this project we will: 1. Identify the factors which made and could have made a difference on the understanding of seismic hazard, vulnerability and risk during past major earthquakes. 2. Analyze the capabilities of new technologies to provide more insightful information before, during and after an earthquake, helping in the effort of understanding the seismic phenomenon. 3. Create guidelines, frameworks and software apps for analyzing and improving how and where we record ground motion parameters generated by earthquakes and earthquake effects, and testing them in Romania.
Archived project
Propagation velocities, often associated with waves amplitude, are the basis of algorithms for seismic data processing and, also, structural and stratigraphic interpretations of the resulted models. Most of the primary information on detailed geological structures comes from seismic studies carried out for the oil industry and dedicated to upper / shallower formations of sedimentary basins. For deep structures, it is necessary to build models of seismic velocities in order to conduct seismological and tectonic studies. Velocity models, using direct or inverse methods on different transects all over the world, have been obtained from deep seismic refraction surveys. The resulted velocity values are averages or trends of linear increase with depth over well-defined intervals. For the sedimentary covers, details and resolution studies of the obtained velocity models can be tested by integrating previous data from industry seismic lines or boreholes that intersect or lie within the profiles. Until now, such studies have not been conducted in Romania in the Transylvanian Depression and Pannonian Basin. Consequently, the main objective of this project is to construct 2-D and 3-D models of P-waves velocity (Vp) distribution with depth, using as input seismic data from reflection or refraction lines (shallow or deep) available for the Transylvanian and Pannonian domains. Shallow P-wave velocities will be verified by seismo-acoustic well logging data, which are data measured along one direction, in depth. The refracted P-waves will be processed to obtain 2-D Vp distributions. The correlation of both types of velocities will result into a more accurate 2-D Vp model. Details about the P-wave velocities into the very shallow section of the subsurface can be obtained from the ambient noise. The processing of the ambient noise is done using the Seismic Interferometry, a method which retrieves P- and S-waves from the recorded noise. Shallow S-wave velocities will be obtained from ambient and coherent noise. Seismic Interferometry will be used to retrieve the surface waves from the ambient noise. The retrieved surface waves will be analyzed in the frequency domain and the 2-D velocity distributions will be determined after the inversion of the dispersion curves. Shallow S-wave velocity distributions on longer distances will be obtained from the analysis of the coherent noise seen on the seismic data recorded using the seismic reflection surveys performed for oil exploration. The analysis of the ambient noise will require the performing of passive seismic measurements. This type of measurements will be done at small and large scales, depending on the size of area covered with measurements. In the final stage, all data will be integrated into a regional velocity model. The boundaries of major tectonic units will be outlined using horizontal velocity gradient and gravity measurements and analyses. The velocity distribution model obtained in this way will represent an invaluable tool for future processing of seismic lines and tectonic modeling for hydrocarbon investigation, having a direct, immediate and significant impact on faster, cheaper and much better quality data processing for the petroleum industry.