نتایج جستجو برای: shallow subsurface structures
تعداد نتایج: 502856 فیلتر نتایج به سال:
Abstract Here we investigate the influence of lithology and thermal state upper crust on earthquake distributions beneath Wakayama region, southern Honshu, Japan, to better understand crustal conditions regional seismogenesis. The earthquakes are concentrated in deeper sections mafic belts shallower pelitic belts, based a comparison relocated hypocenters estimated subsurface geological structur...
Ground Penetrating Radar (GPR) is a shallow geophysical method for detecting and locating subsurface targets. The GPR image echo characteristics of complex underground structures can be obtained by carrying out forward modeling research. traditional finite-difference time-domain (FDTD) has low efficiency accuracy. alternating direction implicit FDTD (ADI-FDTD) algorithm surmounts the stability ...
SHARAD (SHAllow RADar) is a radar for the study of the Martian subsurface provided by the Italian Space Agency (ASI) as a facility instrument on board NASA’s Mars Reconnaissance Orbiter 2005 spacecraft. The scientific objective of SHARAD is the detection of water, either liquid or solid, and the profiling of subsurface ice layers in the first hundreds of meters of the Martian subsurface. Althou...
We theoretically estimate the loss rate of buried ice from spherical bodies 2Y3.3 AU from the Sun. The loss rate is explored as a function of about a dozen parameters.We introduce the concept of a ‘‘buried snow line,’’ where the loss of ice is sufficiently slow over the age of the solar system. For a dusty surface layer, ice can persist within the top few meters of the surface over billions of ...
Water quality along the Waratah Rivulet in the Woronora Lake Catchment, New South Wales (NSW), Australia, has been monitored during the last three years by the Sydney Catchment Authority. Water quality data shows changes in chemical composition due to cracking of streambeds and rockbars, and diversion of surface water into subsurface routes in the Hawkesbury Sandstone aquifer. Water quality ups...
As part of the project “Management of Georisk” (MANGEONAD) of the Federal Institute for Geosciences and Natural Resources (BGR), Hanover, high resolution shallow shear-wave reflection seismics was applied in the Indonesian province Nanggroe Aceh Darussalam, North Sumatra in cooperation with the Government of Indonesia, local counterparts, and the Leibniz Institute for Applied Geosciences, Hanov...
Hydrological modelling can be a relevant tool to support sustainable planning decisions. However, urban hydrological models usually rely on simplified underground representation that may limit their applicability in shallow groundwater environments. This paper introduces set of modules designed describe the numerous interactions between subsurface processes and surface hydrology occur such cont...
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