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Title: Low V p /V s Values as an Indicator for Fractures in the Critical Zone
Abstract Poisson's ratio for earth materials is usually assumed to be positive (Vp/Vs > 1.4). However, this assumption may not be valid in the critical zone because near Earth's surface effective pressures are low (<1 MPa), porosity has a wide range (0%–60%), there are significant texture changes (e.g., unconsolidated vs. fractured media), and saturation ranges from 0% to 100%. We present P‐wave (Vp) and S‐wave (Vs) velocities from seismic refraction profiles collected in weathered crystalline environments in South Carolina and Wyoming. Our data show that ∼20% of the subsurface has negative Poisson's ratios (Vp/Vsvalues < 1.4), a conclusion supported by borehole sonic logs. The low Vp/Vsvalues are confined to the fractured bedrock and saprolite. Our data support the hypothesis that weathering‐generated microcracks can produce a negative Poisson's ratio and that Vp/Vsvalues can thus provide insight into important critical zone weathering processes.  more » « less
Award ID(s):
2012353
PAR ID:
10525151
Author(s) / Creator(s):
; ; ; ; ;
Publisher / Repository:
Wiley Publishing (AGU)
Date Published:
Journal Name:
Geophysical Research Letters
Volume:
51
Issue:
2
ISSN:
0094-8276
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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