Radon levels assessment in relation with seismic events in Vrancea region

Zoran, Maria A.; Savastru, Roxana; Săvăstru, D.

doi:10.1007/s10967-012-1712-3

Cited by 21 publications

(11 citation statements)

References 28 publications

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“…Different criteria can be used to select remotely-sensed earthquake pre-signals for which there is evidence of anomalies in geophysical observations. Observations from Earth-orbiting satellites are complementary to local and regional airborne observations, and to traditional in-field measurements and ground-based sensor networks [15,16].…”

Section: Approach and Methodologymentioning

confidence: 99%

“…can be released that escape into the lower atmosphere and create a localized greenhouse effect, which augments the LST anomalies in the area [16]. Another mechanism to explain the temperature rise preceding an earthquake is the presence of positive hole-type charge carriers in rocks which become activated when rocks are subject to high levels of stress prior to an earthquake.…”

Section: Land Surface Temperature (Lst)mentioning

confidence: 99%

“…Maximum and minimum OLR value ranges including other parameters were defined in the analyzed earthquake case. The high stress field prior to earthquakes is responsible for surface and subsurface deformation in the epicentral region, which, in turn, is responsible for changes in the thermal, electrical and magnetic fields [16].…”

Section: Outgoing Longwave Radiation (Olr)mentioning

confidence: 99%

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Surveillance of Vrancea active seismic region in Romania through time series satellite data

2014

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Cumulative stress energy in active seismic regions caused by tectonic forces creates various earthquake precursors. This energy transformation may result in enhanced transient thermal infrared (TIR) emission, which can be detected through satellites equipped with thermal sensors like MODIS (Terra/Aqua) and AVHRR (NOAA). Satellite time-series data, coupled with ground based observations, where available, can enable scientists to survey pre-earthquake signals in the areas of strong tectonic activity. This paper presents observations made using time series MODIS and NOAA-AVHRR satellite data for derived multi-parameters including land surface temperature (LST), outgoing long-wave radiation (OLR), and mean air temperature (AT) for the moderate, 5.9 magnitude earthquake, which took place on the 27 th of October, 2004, inthe seismic region of Vrancea, in Romania. Anomalous thermal infrared signals, reflected by a rise of several degrees celsius ( • C) in LSTs, and higher OLR values were seen several days before the earthquake. AT values in the epicentral area also increased almost two days prior to the earthquake and intensified three days after the main shock.Increases in LSTs and OLR disappeared three days after the main shock. The survey and joint analysis of geospatial and in-situ geophysical information on land surface temperatures and outgoing long-wave radiation provides new insights into the field of seismic hazard assessment in Vrancea, a significant area of tectonic activity in Romania and Europe.

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Section: Approach and Methodologymentioning

confidence: 99%

Section: Land Surface Temperature (Lst)mentioning

confidence: 99%

Section: Outgoing Longwave Radiation (Olr)mentioning

confidence: 99%

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Surveillance of Vrancea active seismic region in Romania through time series satellite data

2014

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“…Different criteria can be used to select remotely sensed earthquake pre-signals for which there is evidence of anomalies in geophysical observables. Observations from Earth Observation satellites are used in synergy with local and regional airborne observations, and with traditional in-situ and ground-based sensor networks measurements [25,26], and [27].…”

Section: Methodology and Geospatial Data Usedmentioning

confidence: 99%

“…OLR is a NOAA polar-orbiting satellite derived product of the radiative character of energy radiated from the warmer earth surface to cooler space in the 10-12 µm infrared window. The estimates of interpolated OLR values (W/m face and subsurface deformation in the epicentral region, which, in turn, is responsible for changes in the thermal, electrical and magnetic fields [26]. Daily OLR anomalies have been investigated in detail for selected Vrancea earthquakes because these can reflect the energy variation in the earth-atmosphere system and record the earthquake thermal anomalies in different time scales over the seismic monitoring field.…”

Section: Outgoing Longwave Radiation Anomalymentioning

confidence: 99%

Satellite thermal infrared anomalies associatedwith strong earthquakes in the Vrancea area ofRomania

2015

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Thermal anomalies which are known to be significant precursors of strong earthquakes can be evidenced by spectral thermal infrared (TIR) bands recorded by sensors on board of NOAA-AVHRR and Terra/Aqua-MODIS satellite. In order to locate relevant thermal anomalous variations prior to some strong even moderate earthquakes recorded in Vrancea tectonic active zone in Romania, satellite derived geophysical parameters have been used: land surface temperature (LST), outgoing long-wave radiation (OLR) and mean air temperature (AT). Spatiotemporal variations of LST, OLR, and AT before and after three strong earthquakes in Vrancea area (Mw = 7.4, 4 March 1977; Mw = 7.1, 30 August 1986; Mw = 6.9, 30 May 1990) and a moderate earthquake (Mw = 5.9, 27 October 2004) have been analyzed. Anomalous spatio-temporal patterns of these parameters developed a few days up to few weeks before the earthquakes disappeared after the main shocks. Significant increases in land surface temperature, outgoing long-wave radiation, and mean air temperature can be assigned to energy exchange mechanism during earthquake preparatory events. Such preseismic anomalies can be considered to be associated with the thermodynamic, degassing and ionization geochemical processes which seem to be activated due to the increased stress in the ground, and microfracturing of the rocks especially along area's active faults.

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Earthquake Precursors Assessment in Vrancea Region Through Satellite and In Situ Monitoring Data

Zoran

Săvăstru

Mateciuc

2016

Springer Natural Hazards

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Radon levels assessment in relation with seismic events in Vrancea region

Cited by 21 publications

References 28 publications

Surveillance of Vrancea active seismic region in Romania through time series satellite data

Surveillance of Vrancea active seismic region in Romania through time series satellite data

Satellite thermal infrared anomalies associatedwith strong earthquakes in the Vrancea area ofRomania

Earthquake Precursors Assessment in Vrancea Region Through Satellite and In Situ Monitoring Data

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