- Award ID(s):
- 0848248
- NSF-PAR ID:
- 10416219
- Date Published:
- Journal Name:
- Journal of the American Chemical Society
- Volume:
- 144
- Issue:
- 23
- ISSN:
- 0002-7863
- Page Range / eLocation ID:
- 10201 to 10219
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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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.