Victor Mocanu

Victor Mocanu
University of Bucharest | Unibuc · Department of Geophysics

Doctor of Philosophy

About

106
Publications
11,248
Reads
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1,200
Citations
Citations since 2016
14 Research Items
465 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
Geodynamics of the Chile Triple Junction (seismologuy, GPS, modeling) Geodynamics of the Carpathian Orogen (seismology, GPS, modeling) Applied Geophysics (integration of seismic and non seismic results) on various sedimentary basins associated with orogens and platforms Geothermal fields
Additional affiliations
October 1988 - present
University of Bucharest
Position
  • Professor (Full)
Description
  • Professor of Geophysics and, since 2008, Dean of Faculty of Geology and Geophysics

Publications

Publications (106)
Conference Paper
Full-text available
Geothermal energy is known as a renewable source that has little effect on environment, since no burning process is involved in the producing of thermal and electric energy. Geothermal water is considered an environmentally friendly energy source which is valuable especially in polluted areas. Our study area, the Baia Mare region, is located in the...
Conference Paper
Full-text available
The Baia Mare area, located in the northwestern part of Romania, is a Neogene depression in the Pannonian Basin, developed south of the volcanic Tibles-Gutai Mountains. The pre-Neogene basement contains metamorphic rocks of Precambrian and Precambrian-Paleozoic ages and sedimentary rocks of Jurassic, Upper Cretaceous and Paleogene ages. Magmatic ac...
Article
RomUkrSeis is a controlled source wide-angle reflection and refraction (WARR) profile acquired in August 2014. It is 675 km long, running roughly SW-NE from the Apuseni Mountains in Romania and the Transylvanian Basin, crossing the arc of the Eastern Carpathian orogen and terminating in the East European Craton (EEC) in SW Ukraine. Well-constrained...
Article
After a great subduction earthquake, viscoelastic stress relaxation causes prolonged seaward motion of inland areas of the upper plate, as was observed around the turn of the century in the area of the 1960 Mw 9.5 Chile earthquake with Global Navigation Satellite System (GNSS) measurements. However, recent GNSS observations during 2010–2019 indicat...
Article
Full-text available
We developed 3-D isotropic crustal seismic velocity models of central Idaho and eastern Oregon from the IDOR (western IDaho and eastern ORegon) Passive seismic data. Ambient noise tomography yielded crustal velocity structure from vertical component Rayleigh wave group and phase velocity measurements. Results include a strong shear wave velocity co...
Article
Full-text available
The Romanian segment of the Eastern Pannonian Basin and the Moesian Platform are known for their geothermal and hydrocarbon-bearing structures. We used seismic, gravity, and geothermal data to analyze the geothermal behavior in the Oradea and Timisoara areas, from the Romanian segment of Eastern Pannonian Basin, and the Craiova–Bals–Optasi area, fr...
Conference Paper
Full-text available
The studied area is located in the NW of Moldavian Platform, the oldest platform unit of the Romanian territory, representing the western margin of the East European Platform. The integrated analysis and correlation of seismic reflection surveys and wireline logs, together with mud logging and additional geological data, allow a better delineation...
Article
Full-text available
We have performed a deep seismic reflection study, DACIA-PLAN, based on the data recorded along a crooked line across the southeastern Romanian Carpathians. The signal-to-noise ratio (S/N) of these data varies along the seismic profile, and its variation is considered to be an effect of the rough topography, complex subsurface geology, and varying...
Article
Full-text available
We present new images of lithospheric structure obtained from P-to-S conversions defined by receiver functions at the 85 broadband seismic stations of the EarthScope IDaho-ORegon experiment. We resolve the crustal thickness beneath the Blue Mountains province and the former western margin of cratonic North America, the geometry of the western Idaho...
Thesis
RomUkrSeis was a controlled source wideangle reflection and refraction (WARR) profile acquired in August 2014. It is 675 km long, running from the East European Craton in central Ukraine southwestwards into Romania where it crosses the Carpathian Mountains, the Transylvania Basin and terminates in the Apuseni Mountains. Some 350 single component se...
Article
Full-text available
The Petrosani basin is a large and important coal mining zone in the South Carpathians area of Romania. In recent times, most mines have been closed, but an extensive and dense network of galleries still exists. Most of the abandoned ones were not filled in with mine tailings. There is strong concern and evidence that the old galleries are collapsi...
Article
Full-text available
We applied seismic interferometry (SI) by crosscorrelation to ambient-noise panels recorded in the Mizil area, Romania, aiming to retrieve body-wave reflections. To achieve this goal, surface waves in the noise panels input to SI should be suppressed. We did this by selecting for input to SI-only noise panels that are not dominated by surface waves...
Data
Full-text available
During the closure of paleo- and neo-Tethys the accretion of continental fragments to southern Eurasia involved diverse geodynamic and magmatic processes; although this special issue does not attempt to review these in detail our purpose is to draw attention to recent relevant research presented at the ad hoc symposium “Tectonics of the Red River F...
Article
A 2D gravity and magnetic data model has been constructed along a 71 km densely observed profile, called DACIA PLAN GRAV MAN's. The profile crosses part of the nappe pile of the south-eastern Carpathians and includes the seismically active Vrancea Zone and was acquired with the objective to illuminate the basement structure and affinity in this are...
Conference Paper
We determine the P- and S-wave velocities and elastic modulus from the analysis of two seismic reflection dataset recorded on two profiles using vertical component geophones only. We show that the inversion of the dispersion curves obtained for the fundamental and higher modes of the surface waves provide detailed information about the S-wave veloc...
Article
We located continuous seismic tremor with coherent amplitude wave trains in the Chile ridge subduction region (~46.5°S) in two clusters north and south of the Chonos Archipelago, between the Chile trench and the North Patagonian fore arc. Tremor persisted from December 2004 to February 2007 (the entire period of the Chile Ridge Subduction Project t...
Article
Full-text available
Surface waves, considered to be the most difficult type of coherent noise present on land seismic reflection data, carry useful information regarding S-wave velocities. The advantage of analyzing surface waves is that they are recorded using vertical component geophones but provide information that is usually obtained from seismic data recorded wit...
Conference Paper
The signal-to-noise ratio of deep seismic reflection data can be affected by the rough topography and complex geology of the study area. The rough topography is responsible for the irregular positioning of sources and receivers, and the complex geology for the attenuation of the seismic energy. The effect of the irregular positioning of sources and...
Article
Full-text available
In the southern Andes, the oblique convergence of the Nazca plate and the subduction of an active oceanic ridge represent two major tectonic features driving deformation of the forearc in the overriding continental plate, and the relative effects of these two mechanisms in the stress field have been a subject of debate. North of the Chile triple ju...
Conference Paper
The mining activities generate today the biggest pollution problems that the industry is facing. Zlatna mining region, Romania, was declared in the '90s the most polluted area in Europe. The primary goal of the study is to analyze the contamination in the studied area at the soil level, underground terrain, hydrological and hydrogeological systems,...
Conference Paper
The analysis of the geothermal structures requires the use of various types of information, such as geologic, geophysical temperature measurements, time/depth seismic sections, velocity models and hydro-geological data. Two- and three-dimensional distributions of temperatures and a two-dimensional distribution of geothermal gradient were obtained b...
Conference Paper
In the Vienna Basin one of the main targets for geothermal exploration is the Leopoldsdorf fault system. The geothermal reservoir is in the prae-neogene calcareous alps. For description of the reservoir several old 2D seismic sections, well tops, structural maps and geological cross-sections exist. In the seismic sections in the deeper parts of the...
Article
We relocated the six large-magnitude (5.2 < Mw < 6.2) earthquakes of the destructive, tsunamigenic Aysen seismic swarm, which occurred from 2007 January-October in Patagonian Chile. We used P and SH arrival times from near-source stations of a temporary seismic network fortuitously deployed in the area when the swarm began, and also traveltimes to...
Article
The IDOR project is an integrated study of the tectonic boundary between Precambrian North America and accreted terranes (island arcs of the Blue Mountains) in the Idaho-Oregon region. Its goal is to determine how the accretionary edge of the continental margin formed and was subsequently modified by deformation and magmatism. The margin contains u...
Article
Full-text available
A seismic swarm at the Aysén fjord started in January, 2007, reaching its highest activity between January and April, 2007. It was punctuated by the Mw5.3 23rd January event and the Mw6.2 21st April event which triggered a water-wave due to massive landslides; both with dextral strike slip focal mechanisms. More than 100 events were relocated with...
Article
We used cross-correlation of ambient seismic noise recorded in the Chile Triple Junction (CTJ) region to estimate interstation surface wave time-domain Green's functions, and then inverted traveltimes to obtain crustal surface wave velocity models. Interstation distances within the Chile Ridge Subduction Project (CRSP) temporary seismic network ran...
Article
Full-text available
We deployed 39 broadband seismometers in southern Chile from Dec. 2004 to Feb. 2007 to determine lithosphere and upper mantle structure in the vicinity of the subducting Chile Ridge. Body-wave travel-time tomography clearly shows the existence of a long-hypothesized slab window, a gap between the subducted Nazca and Antarctic lithospheres. P-wave v...
Article
Full-text available
The actively spreading Chile Ridge has been subducting beneath Patagonian Chile since the Middle Miocene. After subduction, continued separation of the faster Nazca plate from the slow Antarctic plate has opened up a gap-a slab window-between the subducted oceanic lithospheres beneath South America. We examined the form of the asthenospheric mantle...
Article
Full-text available
A passive seismic survey in April 2009 had two main goals: the use of seismic interferometry to retrieve the seismic signal (reflected waves) from the background noise and to demonstrate that passive surveys can cover spatial gaps between active profiles. Seismic interferometry works well if the passive records are not affected by surface waves wit...
Article
In the Vrancea seismogenic zone (SE Carpathians), where very strong earthquakes (Mw > 7) are reported several times a century, the seismotectonics is very complex. It develops beneath the contact between the Moldavian East European Platform, the Scythian Platform, and the Moesian Platform, to the east and southeast, and terranes of the Transylvania...
Article
We analyse data recorded at stations of the densely spaced Chile Ridge Subduction Project (CRSP), to map phase velocity variations within the array region. We map phase velocity in a two step procedure: first, we take advantage of the high station density of CRSP and thus similar waveforms recorded at the seismometers by cross-correlating filtered...
Article
Surface waves of incoherent seismic noise recorded in the Chile Triple Junction area were used to obtain the impulse response function of the inter-station wave medium in the upper crust. We used one year of data recorded at 38 broadband seismic stations to cross-correlate daily long-period (5-100 sec) wave forms. We obtained nominally 722 Green's...
Article
Challenged by a long and shaking transition from the communist to democratic political and social system, the long term tradition of the Romanian Geosciences faced a new opportunity with the occasion of the International Year of Planet Earth. Special activities have been dedicated to exciting new, integrated Earth Sciences. In addition to regular a...
Article
Full-text available
A velocity model of the upper crust (maximum depth 10–15km) of the earthquake-prone Vrancea area (Romania) from 2D forward ray tracing of densely-spaced refraction data is presented. The model is derived from more than 11,000 travel times recorded at stations 100m apart picked from 42 shot gathers along a 140km line crossing the south-eastern Carpa...
Article
Full-text available
We present shear wave splitting measurements from 5 earthquakes that occurred in the Vrancea seismic zone of the Carpathian Arc. S waves from these events, all with magnitudes >5.4 Mw and deeper than 88km, were recorded at broadband stations of the Global Seismic Network, and the Geoscope and Geofon Networks, and used by us to measure shear wave sp...
Conference Paper
A gravity and magnetic data survey (DACIA PLAN GRAV MAN’S - Danube and Carpathian Integrated Action on Processes in the Lithosphere and Neotectonics Gravity and Magnetic Survey) was conducted on the same path of the seismic profile in order to infer upper
Article
The challenges of present Earth and space science successful programs highly depends on a number of factors which are different from lat century. Most of the problems to be addressed need not only multidisciplinary, but also transdisciplinary approaches. Research teams have to be composed of both experienced experts and young, dynamic, ready-to-lea...
Article
Integrating satellite geodesy and classic geodesy techniques like high accuracy leveling is a powerful approach to try to determine the way various surface deformations could be correlated with human activities. We present a case study from the highest arc dam in SE Europe, Vidraru Dam, Romania. It is a double curved dam of 166 m height and 465 cub...
Article
Full-text available
Aysen Fjord is situated on one branch of the Liquiñe Ofqui Fault Zone (LOFZ), in southern Chile, a dextral intra-arc strike-slip megafault approximately 1000 km long, spatially related to the North Patagonian Batholith and the current volcanic arc. This fault is characterized by strain partitioning which in this region is due to dextral shear stres...
Article
We used cross-correlation of ambient seismic noise recorded in the Chile Triple Juntion (CTJ) region to estimate interstation surface wave time-domain Green's functions and to invert resulting travel times for crustal shear wave velocity. Data were recorded at the Chile Ridge Subduction Project temporary network of 39 broadband sensors deployed in...
Conference Paper
The surface waves are considered the main type of noise present on the land seismic reflection data. For decades, the hard-wired arrays are successfully used for their attenuation. Unfortunately, according to some modeling results, the hard-wired arrays can destroy the seismic signal (primary reflected waves). This is the case of the use of arrays...
Article
It is a long-term debate on the origin of the unusual high seismic activity beneath the Carpathian Bending Zone, and it keeps the geoscientific efforts at high level in this area. The nature of processes involved is very complicated and could be eventually related to several hypothesis, as for example: (1) the oceanic slab subduction ended sometime...
Article
The DACIA PLAN (Danube and Carpathian Integrated Action on Processes in the Lithosphere and Neotectonics) deep seismic reflection survey was performed in August-September 2001, with the proposed objective of obtaining new information on the deep structure of the external Carpathians nappes and the architecture of Tertiary/Quaternary basin developed...
Article
After the fall of the ex-communist system about twenty years ago, the East European countries faced a significant, multilateral challenge in all aspects of their economical, financial, military, scientific and especially educational and professional life. They had a pretty robust tradition in classic education and research, but had to prepare their...
Article
The Carpathian Bend Zone is a key segment of the Alpine-Himalyan Belt and represent the home of a very particular seismic activity: regular very strong earthquakes are being generated in a very narrow, deep volume of a finger-shape, vertically distributed. The nature of processes involved is instill not yet understood and could be eventually relate...
Article
We present a teleseismic travel-time inversion for upper-mantle velocity structure beneath the Chile triple junction region. Data were recorded at 46 seismic stations deployed in southern Chile from December 2004 to February 2007 (for details, see the Chile Ridge Subduction Project, http://seismology.geology.ufl.edu/chile). The area covered by the...
Article
We present evidence that non volcanic seismic tremor detected at Chile Ridge Subduction Project (CRSP) seismic network correlates with the semidiurnal (M2) tidal amplitude variation, enhanced by the lunar monthly (Mm) orbital cycle. Tremors were detected at 14 broadband seismic stations in the Los Chonos Archipelago and Taitao Peninsula by two meth...
Article
The Aysen seismic swarm began January 23, 2007, with a magnitude 5.2 (USGS) earthquake and, after an apparent decrease in activity, continued with a magnitude 5.6 event on February 26. The swarm is characterized by numerous felt earthquakes of small to moderate magnitude, located at crustal depths beneath the Aysen Canal, a prominent fiord of the C...
Article
We present new shear wave splitting measurements of SK(K)S and PKS phases recorded at 39 broadband seismic stations in the Chile triple junction region. The network, deployed December 2004-February 2005 and operated jointly by the University of Florida and the Universidad de Chile (Santiago), spans the region where the Chile Ridge subducts beneath...
Article
We present analyses of episodic non-volcanic seismic tremor recorded at the Chile Ridge Subduction Project temporary seismic network, operated jointly by the University of Florida and the Universidad de Chile, Santiago. The 57 station network was deployed to study subduction of the Chile Ridge spreading center in the Chile Triple Junction region. T...
Article
We present analyses of non-volcanic seismic tremor observed for the first time in South America. The episodic tremor signals were recorded at the Chile Ridge Subduction Project temporary seismic network, operated jointly by the University of Florida and the Universidad de Chile, Santiago. The network was deployed to study subduction of the Chile Ri...
Article
The Vrancea zone of Romania constitutes one of the most active seismic zones in Europe, where intermediate-depth (70–200 km) earthquakes of magnitude in excess of M w = 7.0 occur with relative frequency in a geographically restricted area within the 1108 bend region of the southeastern Carpathian orogen. Geologically, the Vrancea zone is characteri...
Article
Full-text available
The Carpathians–Pannonian Basin system provides a natural laboratory for analysing lithospheric to surface controls on tectonic topography development in a coupled source-to-sink environment. To link processes taking place at depth and at the surface, recent research focused on the interplay between basin evolution, active tectonics, topography evo...
Article
The DACIA PLAN (Danube and Carpathian Integrated Action on Process in the Lithosphere and Neotectonics) deep seismic sounding survey was performed in August–September 2001 in south-eastern Romania, at the same time as the regional deep refraction seismic survey VRANCEA 2001. The main goal of the experiment was to obtain new information on the deep...
Article
The DACIA-PLAN (Danube and Carpathian Integrated Action on Processes in the Lithosphere and Neotectonics) deep seismic reflection survey was performed in August–September 2001, with the objective of obtaining new information on the deep structure of the external Carpathians nappe system and the architecture of the Tertiary/Quaternary basins develop...
Article
We present results of seismic attenuation measurements focused on the Vrancea bend zone of the Carpathians, in order to delimit the lithosphere and asthenosphere in this area. Attenuation observed at 27 stations of the German-Romanian K2 seismic network allows us to evaluate models of subduction or delamination proposed for this region. The seismic...
Article
Results are presented from GPS measurements performed in the Southeastern Carpathians between 1997 and 2004. Data from 25 stations observed during 13 campaigns were analyzed by the Department of Earth Observation and Space Systems (DEOS) of Delft University of Technology. The repeatabilities of the solutions are on the order of 1–4 mm for the horiz...
Article
We use measurements of crustal and upper mantle seismic attenuation in the southeastern Carpathian Arc and surroundings to test mantle responses to Tethys closure in this region. Active seismicity at the Carpathians' Vrancea bend zone can delimit lithosphere and asthenosphere distributions through attenuation observations at overlying seismic stati...
Article
Three deep (18-20 s TWTT), industry type seismic reflection profiles and the DRACULA II (Deep Reflection Acquisition Constraining Unusual Lithospheric Activity) multichannel transect (30 s), collected in the southeast Carpathian foreland basin were processed targeting crustal and upper mantle structures that could substantiate a genetic and geometr...