Pore Pressures in Marine Sediments: 1981 Test of the Geotechnically Instrumented Seafloor Probe (GISP)

摘要

The Geotechnically Instrumented Seafloor Probe (GISP) can make long-term, in-situ measurements of pore water pressure in marine sediments in remote, undeveloped areas. The seafloor package is completely self-contained and includes data processing electronics, solid-state memory, acoustic telemetry, batteries, and pressure transducers. Acoustic telemetry provides the communication link with a surface command and recording system. Two GISP units operated successfully for five months in a 1981 field test on the Mississippi Delta. Data obtained during this test, when combined with the results of SEASWAB I, indicate that from the mudline to a depth of 6 meters, excess pore pressure is near zero. From 6 to 15 meters (the maximum depth studied), excess pore pressure increases at about the same rate as total stress. (ERA citation 08:032644)