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(Table 1) Compressional-wave and shear-wave velocities and elastic constants from DSDP Legs 69 and 70 (1983)

Wilkens, Roy H ; Christensen, Nikolas I ; Slater, L

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In: Supplement to: Wilkens, Roy H; Christensen, Nikolas I; Slater, L (1983): High-pressure seismic studies of Leg 69 and 70 basalts. In: Cann, JR; Langseth, MG; Honnorez, J; Von Herzen, RP; White, SM; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 69, 683-686, https://doi.org/10.2973/dsdp.proc.69.142.1983

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Publication Date: 2024-01-04

Description: Shear-wave and compressional-wave velocities of 26 basalt samples collected at Site 504 during Deep Sea Drilling Project Legs 69 and 70 were measured at elevated confining pressures. The young basalts have higher velocities than average DSDP basalts, because of their lack of alteration. Measurements of sample porosity are combined with laboratory and in situ velocity measurements to yield estimates of total crustal porosity: 13% at the top of Layer 2, and very low porosity below a depth of 2.0 km.

Keywords: 69-504A; 69-504B; 69-505B; 70-504B; Bulk modulus; Deep Sea Drilling Project; Density, wet bulk; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Event label; Glomar Challenger; Latitude of event; Leg69; Leg70; Longitude of event; Multi-Sensor Core Logger (MSCL), GEOTEK; North Pacific/GRABEN; Poisson's ratio; Porosity; Pressure; Sample code/label; see reference(s); Shear modulus; Velocity, compressional/shear wave ratio; Velocity, compressional wave; Velocity, shear wave

Type: Dataset

Format: text/tab-separated-values, 2320 data points

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Imprint of climate and climate change in alluvial riverbeds: Continental United States, 1950-2011 (2013)

Slater, L. J., Singer, M. B.

Geological Society of America (GSA)

In: Geology

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Publication Date: 2013-04-19

Description: Alluvial riverbed elevation responds to the balance between sediment supply and transport capacity, which is largely dependent on climate and its translation into fluvial discharge. We examine these relations using U.S. Geological Survey streamflow and channel measurements in conjunction with basin characteristics for 915 reference ("least disturbed") measurement stations across the conterminous United States for the period A.D. 1950–2011. We find that (1) 68% of stations have bed elevation change ( BEC ) trends (p 〈 0.05) with median values of +0.5 cm/yr for aggradation and –0.6 cm/yr for degradation, with no obvious relation to drainage basin structure, physiography, or lithology; (2) BEC correlates with drainage basin area; (3) high-flow variability ( Q 90 / Q 50 , where Q is discharge and 90 and 50 are annual flow percentiles) translates directly into the magnitude, though not the direction, of BEC , after accounting for the scale dependence; (4) Q 90 / Q 50 declines systematically from dry to wet climates, producing disproportionately high rates of BEC in drier regions; and (5) marked increases in precipitation and streamflow occurred disproportionately at dry sites, while streamflow declined disproportionately at wet sites. Climatic shifts in streamflow have the potential to increase/decrease sediment flux and thus affect riverbed elevation by altering flood frequency. These unforeseen responses of bed elevation to climate and climate change have important implications for sediment budgets, longitudinal profiles, ecology, and river management.

Print ISSN: 0091-7613

Electronic ISSN: 1943-2682

Topics: Geosciences