Tectonic and geologic influences on soil gas radon emission along the western extension of Damascus fault, Syria

Al-Hilal, Mohamed; Abdul-Wahed, Mohamad Khir

doi:10.1007/s12665-016-6292-z

Cited by 8 publications

(2 citation statements)

References 26 publications

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“…The emission of gases, such as Rn, CO 2 , CH 4 , and He, from the solid Earth to the nearsurface can be increased by tectonic and seismic activity (King et al, 1996;Giammanco et al, 1998;Fu et al, 2005;Al-Hilal and Abdul-Wahed, 2007;Zhou et al, 2010;Fu et al, 2016;Yuce et al, 2017). Previous studies have demonstrated that a difference in stress state can affect the concentration and type of soil gas, and soil gas surveys have been performed to assess the potential for seismic hazard prediction (Fu et al, 2008;Kumar et al, 2009;Sun et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Spatial variations of Rn and CO2 emissions in the Wuzhong–Lingwu region, northwest China

Liu

Zeng

et al. 2023

Front. Earth Sci.

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Soil gas Rn and CO2 in surface rupture and deep-seated fault zones are important indicators for tectonic and seismic activities. The spatial distributions of Rn and CO2 concentrations and their relationships with earthquakes and stress state in the Wuzhong–Lingwu area of Ningxia, Northwest China, were investigated through field observations based on 76 measurement points, spatial interpolation and six crossing-fault profiles along Yellow River Fault zone (YRF). Observed results of the soil gas Rn and CO2 in different segments of Yellow River Fault zone illustrated that YRF has features of both strike-slip and certain normal fault characteristics. Moreover, the difference in seismic activity could also account for the differences in gas concentration and relative activity intensity (RAI) in the Yellow River Fault zone. Significant differences in the spatial distributions of Rn and CO2 were identified in gridded observation mode. By comparing these spatial distributions with the surface latent heat flux (SLHF), volumetric soil water layer (SWVL), and lithology, an anomalous high-Rn area was identified in the east and south Qingtongxia, and associated with Permian sandstone and mudstone in a piedmont setting. Away from a strong impact of irrigation in the Yinchuan Basin, CO2 anomalies were identified in the transition area between the Yinchuan Basin and the mountains and coincided with a dramatic negative variation of surface latent heat flux, which was considered to reflect humus accumulation, rich organic matter, and strong soil microorganism activity in loosely accumulated mountain alluvial deposits. After excluding gas anomalies related to shallow soils and surface geology, anomalies of Rn and CO2 in the west of Lingwu were consistent with the distribution of low seismic b-values and frequent seismic activity in plane and profile. According to similar studies in the north-south seismic belts, it is believed that high stress and strong seismic activity increased the permeability of rocks and boosted the gas emission in the west of Lingwu. Base on a crustal thickness variation belt, high-velocity bodies, and in this region, an higher seismic hazard was illustrated. This study offers new insight into combining geochemical characteristics of soil gas and seismological methods to estimate regional seismic hazards.

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Section: Introductionmentioning

confidence: 99%

Spatial variations of Rn and CO2 emissions in the Wuzhong–Lingwu region, northwest China

Liu

Zeng

et al. 2023

Front. Earth Sci.

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“…One encouraging technique for achieving this goal is probably the use of soil gas radon measurement, which has been recognized as a significant natural tracer for characterizing the structure of subsurface faults in several tectonic regions throughout the world (King et al, 1996;Baubron et al, 2002;Steinitz et al, 2015). Thus, considerable information concerning the trend and location of the fault, besides understanding the nature of its tectonic activity, could be obtained through analyzing the distribution pattern of radon emission in the survey area (Etiope et al, 2002;Al-Hilal and Abdul-Wahed, 2016). Accordingly, the main objective of this study is to check whether the bounding fault of the Ghab pull-apart basin shows any spatial tectonically-induced radon anomalies that might be useful for mapping out the trend of the fault, and providing further information concerning the current active status of its local tectonics.…”

Section: Introductionmentioning

confidence: 99%

Soil gas radon measurements for investigating the actual status of seismic quiescence along the bounding fault of the Ghab pull-apart basin in western Syria

Al-Hilal

Abdul-Wahed

2018

GeofInt

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El propósito de este trabajo consistió en investigar posibles cambios de radón relacionados con la zona de falla que pudieran mostrar alguna relación con la tectónica local a lo largo de la zona de falla de la cuenca de Ghab. A pesar de su actividad histórica, la falla de Ghab presenta actualmente una falta de actividad sísmica con un periodo largo de quietud sísmica. Se escogieron 7 sitios para realizar muestreos de radón utilizando un equipo ALPHAGUARD. El valor promedio normal de radón de fondo se obtuvo con medidas realizadas lejos de la zona de influencia de la falla. Se definió un rango estadístico de variaciones anómalas de radón con límites marcados por el valor promedio mas/menos dos desviaciones estándar (X+/- 2DS). Los resultados iniciales muestran incrementos de radón en las estaciones de monitoreo a lo largo de la zona de falla con picos 4-5 veces mayores que el nivel de fondo. Aunque estas concentraciones anómalas relativamente grandes podrían confirmar la utilidad del radón como un posible indicador para trazar los límites de la falla, no prueban necesariamente una relación con la actividad tectónica del área. Sin embargo, estos incrementos de radón podrían indicar una evidencia de zonas con mayor permeabilidad asociadas a la deformación de la estructura en la zona de ruptura.

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Use of hydrochemistry, environmental isotopes and radon distribution for assessment of groundwater in the Cenomanian–Turonian aquifer system: a case study from the Barada River valley, Syria

Al-Hilal

Kattan

2022

J Radioanal Nucl Chem

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Tectonic and geologic influences on soil gas radon emission along the western extension of Damascus fault, Syria

Cited by 8 publications

References 26 publications

Spatial variations of Rn and CO2 emissions in the Wuzhong–Lingwu region, northwest China

Spatial variations of Rn and CO2 emissions in the Wuzhong–Lingwu region, northwest China

Soil gas radon measurements for investigating the actual status of seismic quiescence along the bounding fault of the Ghab pull-apart basin in western Syria

Use of hydrochemistry, environmental isotopes and radon distribution for assessment of groundwater in the Cenomanian–Turonian aquifer system: a case study from the Barada River valley, Syria

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