Earth in motion; recent discoveries and future prospects for IODP

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Author(s): Arculus, Richard J.
Author Affiliation(s): Primary:
Australian National University, Canberra, A.C.T., Australia
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: The "Earth in Motion" theme of the decadal Science Plan of the International Ocean Discovery Program encompasses research on processes and hazards on human time scales. The challenges addressed include: the mechanisms that control the occurrence of destructive earthquakes, landslides, and tsunami; properties and processes governing the flow and storage of carbon in the subseafloor; and the linkage provided by subseafloor fluids in tectonic, thermal, and biogeochemical processes. on Earth, physical processes churn water-rich outer layers back into the planet's interior. A rich variety of chemical processes result from this cycling. Release of fluids from subducted materials during sediment compaction and metamorphic transformations are thought to be critical in the generation of earthquakes, ranging from slow-slip to catastrophic fast-slip events. A sustained effort to explore the processes of earthquake and tsunami generation continues at the Nankai margin of Japan. Transect drilling, borehole observatories that measure physical and chemical processes recorded in the fluids of the accretionary prism, and real-time transmission of these data to shore via subsea cabling will prove critical for addressing the first of the theme's challenges. The final deep drilling to the major subduction thrust fault at Nankai will be tackled soon. Elsewhere in the Indo-Pacific "Ring of Fire" during the past decade, the Program has recovered the sediments input to the Sumatra subduction zone (2004 quake) and samples directly from the Tohoku (2011 quake) slip horizon. The geology of the materials and behaviors of the respective convergent margins are idiosyncratic: thick (Andaman Fan) dewatered and compacted sediments are input at Sumatra whereas fault motion was confined at Tohoku to thin, weak, and highly deformable deep-sea clays. In the oceanic crust in the vicinity of spreading ridges, the Program has pioneered measurements of flow migrations between boreholes with chemically-tagged fluids. The first stages of the Program's study of slow-slip earthquakes at the Hikurangi margin of New Zealand have recently been completed. And results are imminent from the just-completed, pioneering deep penetration of a Kermadec island arc-hosted hydrothermal system.
Year of Publication: 2018
Research Program: IODP2 International Ocean Discovery Program
Key Words: 07 Marine Geology and Oceanography; Geochemistry; International Ocean Discovery Program; International cooperation; Nankai Trough; North Pacific; Northwest Pacific; Pacific Ocean; Plate tectonics; Programs; Tectonics; West Pacific
Record ID: 2019050453
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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