Near-surface earth resistivity and underground water level anomalies were recorded at Qingdao seismic observatory of Shandong Province before and after the MS8.0 Wenchuan Earthquake of May 12,2008.The observed data of...Near-surface earth resistivity and underground water level anomalies were recorded at Qingdao seismic observatory of Shandong Province before and after the MS8.0 Wenchuan Earthquake of May 12,2008.The observed data of earth resistivity at the observatory revealed that the underground water level dropped and the resistivity increased.It is postulated that in the special tectonic setting at Qingdao observatory,the variation of stress and strain caused the change of water level beneath the station,thus,leading to the variation of earth resistivity.The relationship between the variation of stress field and the change of earth resistivity before earthquake is analyzed.展开更多
The study area extended from El-Gora and its vicinities in the south to E1 Sheikh Zowyed and Rafah cities in the north. Quantitatively the water bearing formation in the area has been illustrated by applying the PMW1N...The study area extended from El-Gora and its vicinities in the south to E1 Sheikh Zowyed and Rafah cities in the north. Quantitatively the water bearing formation in the area has been illustrated by applying the PMW1N （Processing Modflow for Windows） and modulus contour map techniques. Qualitatively, the groundwater is evaluated by an isosalinity distribution map. The hydraulic parameters of the water bearing formations were determined and evaluated through 12 pumping tests carried out on selected wells. On the other hand, the ground elevation of the study area is illustrated by a DEM （Digital Elevation Model）. The DEM map indicated that the investigated area lies within a low land area. Due to the depths of groundwater （46.1-105 m from the ground surface）, the rainfall replenishment is nearly absent. Based on the resulting modulus contour map, the northern and northwestern portions are characterized by reasonable potentiality of groundwater. Moreover, the eastern and southern portions reflect limited aquifer potentials. The mathematical modeling results revealed that the recharge to the investigated aquifer is about 9.794 million m3.展开更多
基金supported by Natural Science Fondation of Shandong Province(ZR2010DM008)National Natural Science Foundation(40534023, 41074047),China
文摘Near-surface earth resistivity and underground water level anomalies were recorded at Qingdao seismic observatory of Shandong Province before and after the MS8.0 Wenchuan Earthquake of May 12,2008.The observed data of earth resistivity at the observatory revealed that the underground water level dropped and the resistivity increased.It is postulated that in the special tectonic setting at Qingdao observatory,the variation of stress and strain caused the change of water level beneath the station,thus,leading to the variation of earth resistivity.The relationship between the variation of stress field and the change of earth resistivity before earthquake is analyzed.
文摘The study area extended from El-Gora and its vicinities in the south to E1 Sheikh Zowyed and Rafah cities in the north. Quantitatively the water bearing formation in the area has been illustrated by applying the PMW1N （Processing Modflow for Windows） and modulus contour map techniques. Qualitatively, the groundwater is evaluated by an isosalinity distribution map. The hydraulic parameters of the water bearing formations were determined and evaluated through 12 pumping tests carried out on selected wells. On the other hand, the ground elevation of the study area is illustrated by a DEM （Digital Elevation Model）. The DEM map indicated that the investigated area lies within a low land area. Due to the depths of groundwater （46.1-105 m from the ground surface）, the rainfall replenishment is nearly absent. Based on the resulting modulus contour map, the northern and northwestern portions are characterized by reasonable potentiality of groundwater. Moreover, the eastern and southern portions reflect limited aquifer potentials. The mathematical modeling results revealed that the recharge to the investigated aquifer is about 9.794 million m3.
