A5012109334- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Seismic Waves and Analysis
- earthquake and tectonic studies
- Marine and environmental studies
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Sensor Technology
- Radioactivity and Radon Measurements
- Geological Formations and Processes Exploration
- Radiation Detection and Scintillator Technologies
- Flood Risk Assessment and Management
- Structural Health Monitoring Techniques
- Ionosphere and magnetosphere dynamics
- GNSS positioning and interference
- Geochemistry and Geologic Mapping
- Seismic Performance and Analysis
- Dam Engineering and Safety
- Advanced Fiber Optic Sensors
- Spectroscopy and Laser Applications
- Landslides and related hazards
- Geophysics and Gravity Measurements
- Geophysical and Geoelectrical Methods
- Geological and Geochemical Analysis
- Ocular and Laser Science Research
- High-pressure geophysics and materials
Institutul National de Cercetare si Dezvoltare pentru Fizica Pamantului
2012-2024
Academy of Romanian Scientists
2020
University of Bucharest
2020
Romanian Space Agency
2016
National Institute of Research and Development for Optoelectronics
1995-1998
Abstract. In the last years disturbances in VLF/LF radio signals related to seismic activity have been presented. The data were collected by receivers located on ground or satellites. ground-based research implies systematic collection a network of receivers. Since 2000 "Pacific VLF network", conducted Japanese researchers, has operation. During 2008 receiver was developed Italian factory Elettronika (Palo del Colle, Bari). is equipment working and LF bands. It can monitor 10 frequencies...
Many previous research studies have shown how local and even regional earthquakes can significantly affect the release of radon in soil. The aim this work is to investigate relationship between measurements daily seismic activity rate develop a methodology that allows estimating using only measurements. To carry out study, earthquake catalogue Vrancea region (Romania) has been used estimate during given time period, which were also recorded, from January 2016 September 2020. zone represents...
Electric field amplitude and phase measurements between narrowband VLF/LF transmitters receivers in the sub-ionospheric waveguide are affected altered by man-made natural sources (Nina 2024; Boudjada et al., 2024a,b). In this study we investigate Mw≥5.0 earthquakes (EQs) which occurred Europe during year 2024 based on data from INFREP receiver network (Biagi 2019; Moldovan 2015; Galopeau 2023). selected Mediterranean area with geographical longitude [-10°E, 40°E]...
In recent decades, significant efforts have been devoted to understanding and interpreting the link between ionospheric perturbations natural or anthropogenic phenomena, such as seismic activity, electrical geomagnetic storms, unidentified radio emissions. This is achieved through various methods among which also study of electromagnetic (EM) wave propagation in very low frequency (VLF, 3–30 kHz) (LF, 30–300 bands. These bands enable long-distance communication,...
Climate change is increasing the frequency and severity of extreme weather events, presenting substantial risksto both natural constructed settings. In seismically active areas, interplay between climate-induced events geophysical processes may intensify seismic hazards, affecting essential infrastructure ecosystems. The complex project "Competence Center for Change Digital Twin Earth forecasts societal redressement: DTEClimate", funded within framework National Recovery Resilience Plan...
Carpathian Orogen represents a natural laboratory for studying geodynamic interactions between lithospheres of different ages. The ancient Archean Craton, such as the East European and Proterozoic platforms like Scythian Moesian platforms, collided with younger Tisza Dacia Mega-Units, resulting in formation current architecture Mountains. To better understand how lithospheric structure on Romanian territory changes from Craton to microplates, we used earthquake data recorded at permanent...
Background: The intermediate-depth seismicity in the Vrancea region (Romania) is characterized by localized and persistent earthquake activity that culminates about two or three times a century with occurrence of large event (M ≥ 6.5). Here we have revisited some important characteristics, using catalog data spanning different time periods: 1960–1999 2005–2013. Methods: determined b-value frequency-magnitude distribution earthquakes, maximum likelihood procedure, estimated parameter β to...
VLF/LF (20 - 300 kHz) radio waves propagation is affected by different factors such as meteorological conditions, solar bursts and geomagnetic activity. At the same time, variations of some parameters in ground, atmosphere ionosphere occurring during preparatory phase earthquakes can produce disturbances previous signals along their paths: these are precursors. Since 2009, several receivers have been installed throughout Europe order to realize a European (VLF/LF) network for studying...
Abstract. We investigate the VLF emissions observed by Instrument Champ Electrique (ICE) experiment onboard DEMETER micro-satellite. analyze intensity level variation 10 days before and after occurrence of l'Aquila earthquake (EQ). found a clear decrease received signal related to ionospheric whistler mode (mainly Chorus emission) transmitted DFY station in Germany, few (more than one week) earthquake. The power spectral density decreases more two orders magnitude until EQ, it recovers...
On November 22, 2014 at 21:14:17 local hour (19:14:17 GMT) a M<sub>L</sub>=5.7 crustal earthquake occurred in the area of Marasesti city Vrancea county (Romania) - epicenter was located north latitude 45.87° and east longitude 27.16°, with focal depth 39 km. This is main shock sequence that started this lasted until end January. During sequence, characterized by absence foreshocks, number 75 earthquakes were recorded 72 hours, largest which same day shock, 22:30...
The study presents a statistical cross-correlation between geomagnetic anomalies, earthquake occurrence and solar magnetic storms. working data are from: (i) field records from Muntele Rosu (MLR) Observatory, Surlari (SUA) and/or Tihany (THY) INTERMAGNET Observatories; (ii) seismic for the Vrancea source zone; (iii) daily indices NOAA/Space Weather Prediction Center. All of datasets were recorded 1996 to present, at MLR, SUA or THY, they automatically corrected using LabVIEW program...
(1) Background: The intermediate-depth seismicity in the Vrancea region (Romania) is characterized by localized and persistent earthquake activity that culminates about two or three times a century with occurrence of large event (M 6.5). Here we have revisited some important characteristics, using catalog data spanning different time periods: 2005 – 2013 1960 2000. (2) Methods: determined b-value frequency-magnitude distribution earthquakes, maximum likelihood procedure, estimated parameter...
Since 2009 a network of VLF (20 - 60 kHz) and LF (150 300 radio receivers is operating in Europe order to study the disturbances produced by earthquakes on propagation these signals. In 2011 was formed nine receivers, which three are located Italy one Austria, Greece, Portugal, Romania, Russia Turkey. On May 19, 2001 an earthquake (Mw = 5.7) occurred western Turkey, that inside “sensitive” area network. The data collected during April-May were studied using Wavelet spectra, Principal...
Large-scale radon monitoring is carried out due to the fact that it directly responsible for public health. European Directive 2013/59/EURATOM has been transposed into legislation of several countries and provides need long-term in homes workplaces by setting average annual reference level at 300 Bq/m3. At same time, a precursor factor, its emission being correlated with seismic volcanic activity. In this case, protection population ensured forecast similar meteorological one. The NIEP...
In 2008, a radio receiver that works in very low frequency (VLF; 20-60 kHz) and LF (150-300 bands was developed by an Italian factory. The can monitor 10 frequencies distributed these bands, with the measurement for each of them electric field intensity. Since 2009, to date, six receivers have been installed throughout Europe establish ‘European VLF/LF Network’. At present, two are into operation Italy, remaining four located Greece, Turkey, Portugal Romania. For present study, data...
This study analyzes the possibility to use geophysical and geochemical parameters in an OEF (Operational Earthquake Forecasting) application correlated with short-term changes seismicity rates using a magnitude–frequency relationship. Tectonic stress over limits of rock elasticity generates earthquakes, but it is possible that emission gases increases as result breaking process. The question how reliable radon-222 Carbon Dioxide (CO2), effects on air ionization aerosol concentration,...
We designed a convolutional neural network application to detect seismic precursors in geomagnetic field records. Earthquakes are among the most destructive natural hazards on Earth, yet their short-term forecasting has not been achieved. Stress loading dry rocks can generate electric currents that cause changes field, yielding theoretically detectable pre-earthquake electromagnetic emissions. propose CNN model scans windows of data streams and self-updates using nearby earthquakes as...
Understanding the seismo–ionospheric coupling mechanism requires a quiet geomagnetic condition, as this represents an ideal situation to detect abnormal variations in field. In reality, continuous interactions between solar wind and Earth’s magnetosphere create many fluctuations field that are more related sun–magnetosphere than seismotectonic causes. A triaxial magnetometer was installed at Muntele Rosu Observatory near Vrancea seismic zone 1996 measure local magnetic Since 2002, data have...