The porosity of saturated shallow sediments from seismic compressional and shear wave velocities

Passive processing of active nodal seismic data: Estimation of V<sub>P</sub> / V<sub>S</sub>-ratios to characterize structure and hydrology of an alpine valley infill

“…This is largely because of the interest in shallow soil structure for geotechnical and hydrological applications and the ease at which shallow P-and Swave data can be acquired. Uyanik (2011) summarizes VP/VSratios of seismic measurements in shallow (< 20 m depth) 5 sediments (gravel, sand, clay-silt) with porosities ranging from 20% to 50%. He concludes that water saturation is indicated by VP/ VSratios larger than 3.3 and reports maximum VP/VSratios for low-saturation (10% -50%) soils of 5.0.…”

Seismic evaluation of shallow-depth structure, faulting, and groundwater variations across the Dos Palmas Preserve, Riverside County, California

“…The observed V P /V S ratios are large relative to those expected for rocks (~1.4-1.8), but most are in the expected range for saturated, unconsolidated sediments. V P /V S ratios are highly variable in saturated, unconsolidated sediments and clays (Stumpel and others, 1984;Catchings and Lee, 1996;Uyanik, 2011;Catchings and others, 2014;Pasquet and others, 2015), but high values (>6) calculated at discrete locations and depths (>25 m) along our model are atypical of shallow clastic sediments (see discussion below) and may be related to fault zones (Catchings and others, 2014) and (or) localized saturated clays (Stumpel and others, 1984).…”

Relationship between macro-fracture density, P-wave velocity, and permeability of coal

“…3 1998; Brown et al, 2009;Wang et al, 2009;Kassab and Weller, 2011;Uyanik, 2011;Abraham et al, 2012;Jeanne et al, 2012;Maalej et al, 2013), permeability Kern, 1998, 2000), temperature (Hampton, 1967;Krzesińska, 2000;Punturo et al, 2005), stress (Gardner et al, 1974;Punturo et al, 2005;Yang et al, 2014), the degree of water saturation (Ghorbani et al, 2009), and rock mechanic parameters (Yasar and Erdogan, 2004;Goueygou et al, 2009). Coal, as a rock with a complex component composition, is characterized by strong acoustic anisotropy.…”