This paper investigates the relationship between river flow, rainfall and groundwater pumpage in the Mikkes stream during the period 1968-2009. The Mikkes basin is located in the north center of Morocco and consists of three different zones that represent diversified geologies. This basin includes a phreatic and confined aquifer in Saïs basin and a shallow aquifer in the Tabular Middle Atlas. A...

We analyzed seismicity linked to the 2014 phreatic eruption of Mount Ontake, Japan, on 27 September 2014. We first relocated shallow volcano tectonic (VT) earthquakes and long-period (LP) events from August to September 2014. By applying a matched-filter technique to continuous waveforms using these relocated earthquakes, we detected numerous additional micro-earthquakes beneath the craters. Th...

BACKGROUND The Soufriere Hills, a stratovolcano on Montserrat, started erupting in July 1995, producing volcanic ash, both from dome collapse pyroclastic flows and phreatic explosions. The eruptions/ash resuspension result in high concentrations of suspended particulate matter in the atmosphere, which includes cristobalite, a mineral implicated in respiratory disorders. AIMS To conduct toxico...

To reveal the effect of interlayer on temperature freeze-thaw soil and transformation between phreatic water in shallow groundwater areas, a test was conducted with table depth 0.5 m under laboratory action. The sand columns constant freezing at −20°C lasted for 20 days, thawing process 15 days were monitored. interlayers particle size 0.1–0.5 mm (d 50 = 0.3 mm) thickness 5 cm set 5, 15, 20, 25...

In this work the possibility of identifying two important aspects in process adopting soil parameters for calculating stability analysis models tailing dams is discussed. The use commercial computer programs calculations allows obtaining numerically exact results. Its representativeness, however, will be linked to correct definition phreatic regime and prediction volumetric behavior during shea...