Understanding shallow subsurface fluid flow in marine sediments through coring, logging, experiments, and models

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Author(s): Dugan, Brandon
International Ocean Discovery Program, Expedition 308 Science Party
Author Affiliation(s): Primary:
Colorado School of Mines, Golden, CO, United States
Volume Title: AGU 2018 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2018; American Geophysical Union 2018 fall meeting, Washington, DC, Dec. 10-14, 2018. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: Scientific ocean drilling provides unprecedented access to marine sediments for detailed understanding of fluid flow, sediment deformation, and sediment strength. I will summarize how our ability to determine in situ pressures and permeability have evolved during ODP and IODP through advancements in downhole measurements, better access to sample materials, dedicated samples for onshore geomechanical studies, and multidisciplinary collaborations offshore and onshore. These advancements provide a clearer understanding on the magnitude of shallow overpressure, the importance of overpressure for submarine landslide initiation and dynamics, and the hydrologic and strength states of inputs to subduction zones. I will demonstrate how these in situ characterizations have led to improved process-based models on fluid flow focusing and slope failure along passive margins, timing and thickness of submarine landslides, and pressure sources and transients along decollement horizons. These advances in measurements, analyses, and models will be showcased by examples from the Gulf of Mexico (IODP Exp. 308), the Nankai Trough (IODP Exp. 322 and 338), the Sumatra Seismogenic Zone (IODP Exp. 362), and the Hikurangi Margin (IODP Exp. 372).
Year of Publication: 2018
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 07 Marine Geology and Oceanography; Atlantic Ocean; Cores; Drilling; Expedition 308; Expedition 322; Expedition 338; Expedition 362; Expedition 372; Experimental studies; Gulf of Mexico; Indian Ocean; Integrated Ocean Drilling Program; International Ocean Discovery Program; Marine environment; Marine sediments; NanTroSEIZE; North Atlantic; North Pacific; Northwest Pacific; Pacific Ocean; Sediments; Shikoku Basin; South Pacific; Southwest Pacific; West Pacific
Coordinates: N271500 N280600 W0890000 W0942500
N324445 N331805 E1365522 E1363812
S385830 S384330 E1790800 E1782830
Record ID: 2019050459
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