Pore Pressures in Marine Sediments: An Overview of Measurement Techniques and Some Geological and Engineering Applications

Schultheiss, Peter

doi:10.1007/978-94-009-0615-0_13

Cited by 4 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In situ measurements include a record of the pressure pulse associated with deployment, a decay of this excess pressure, and tidal signals that propagate through the shallow sediments. In situ pressures and pressure gradients were estimated by extrapolation of the in situ records to equilibrium conditions, and ambient hydrostatic pressures were subtracted to derive differential pressures accompanying fluid flow near the seafloor [Schultheiss, 1990[Schultheiss, , 1997Fang et al, 1993].…”

Section: Pore Pressure Measurementsmentioning

confidence: 99%

Multiple scales of hydrothermal circulation in Middle Valley, northern Juan de Fuca Ridge: Physical constraints and geologic models

Stein¹,

Fisher²

2001

J. Geophys. Res.

View full text Add to dashboard Cite

Section: Pore Pressure Measurementsmentioning

confidence: 99%

Multiple scales of hydrothermal circulation in Middle Valley, northern Juan de Fuca Ridge: Physical constraints and geologic models

Stein¹,

Fisher²

2001

J. Geophys. Res.

View full text Add to dashboard Cite

“…Finally, the paper furnishes age constraints and suggests triggering mechanisms for individual landslides. The work is based on data from state-of-the-art submarine geophysical techniques, including Simrad EM-12S multibeam bathymetry (Keeton and Searle, 1996), TOBI (Towed Ocean Bottom Instrument) deep-towed side-scan sonar (Flewellen et al, 1993), high-and ultrahigh-resolution seismic reflection profiles, and PUPPI (Pop Up Pore Pressure Instrument) pore pressure measurements (Schultheiss, 1989).…”

Section: Introductionmentioning

confidence: 99%

Flank stability and processes off the western Canary Islands: a review from El Hierro and La Palma

Úrgeles¹,

Canals²,

Masson³

2001

Sci. Mar.

View full text Add to dashboard Cite

SUMMARY: The morphological characterisation of the western submarine island flanks of El Hierro and La Palma differentiates four type-zones that may give new insights into the evolution of oceanic island slopes. The different type-zones result from the interplay between constructive volcanic processes, hemipelagic settling and volcano collapses. The latter results in massive debris avalanche deposits, which form large volcaniclastic aprons. In most cases, the headwall scarps are clearly exposed on the emerged part of the islands. The events that occurred in the youngest and westernmost islands of El Hierro and La Palma have vertical runouts exceeding 6,000 m and volumes that can reach several hundred km 3 . The landslide frequency for the entire Canaries is one major event per 90 ka. Triggering mechanisms are closely related to magmatic processes. The increase in the shear stress is directly linked with the forceful intrusion of magma along "ridge-rift" systems, while in the western Canary Islands it seems that the main process reducing shear resistance may be related to the rise in pore pressure due to hydrothermal circulation.

show abstract

“…Measurement of pore fluid pressure as a crucial factor controlling effective strength and mechanical behavior of saturated sediments is a difficult task, because the measurement itself disturbs the hydrologic regime [ Schultheiss , 1990; Lee and Elsworth , 2004]. Otherwise, pore pressure is a fundamental parameter for the understanding of the stability of (saturated) sediments and hazards.…”

Section: Introductionmentioning

confidence: 99%

Geotechnical in situ characterization of subaquatic slopes: The role of pore pressure transients versus frictional strength in landslide initiation

Stegmann¹,

Strasser²,

Anselmetti³

et al. 2007

Geophysical Research Letters

View full text Add to dashboard Cite

Mineralogical composition and pore fluid pressure are the crucial controls for mechanical stability of water‐saturated sediments. Their in situ measurements were undertaken in earthquake‐triggered slope deposits in Lake Lucerne (Switzerland) in addition to geophysical characterization and laboratory index properties, shear and consolidation experiments on core. Two lithological units were identified: A weak, lightly underconsolidated section of postglacial silty clays overlies overconsolidated fine‐grained glacial deposits with coarser components and excess fluid pressure (ca. 2.5× higher than in the hanging wall clay). In the event of an earthquake, hydrofracturing in the overconsolidated section facilitates an upward pore pressure pulse to the base of the softer, less stable unit. Here, excess pore pressure initiates sliding along a failure plane at the lithological boundary, causing the entire postglacial sedimentary section to slip downslope. We propose that many submarine landslides at active and passive continental margins may follow this mechanism of pore pressure‐induced failure.

show abstract

Pore Pressures in Marine Sediments: An Overview of Measurement Techniques and Some Geological and Engineering Applications

Cited by 4 publications

References 24 publications

Multiple scales of hydrothermal circulation in Middle Valley, northern Juan de Fuca Ridge: Physical constraints and geologic models

Multiple scales of hydrothermal circulation in Middle Valley, northern Juan de Fuca Ridge: Physical constraints and geologic models

Flank stability and processes off the western Canary Islands: a review from El Hierro and La Palma

Geotechnical in situ characterization of subaquatic slopes: The role of pore pressure transients versus frictional strength in landslide initiation

Contact Info

Product

Resources

About