Now Sailing: NanTroSEIZE Front Thrust Long-Term Borehole Monitoring System

This expedition aboard Chikyu will install a long-term borehole monitoring system (LTBMS) in NanTroSEIZE hole C0006, complementing two existing nearby subseafloor observatories as part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). The LTBMS will connect to Japan's DONET undersea cabled network, sending pressure, strain, and seismic data to the mainland in real time. 

Now Sailing: Ross Sea West Antarctic Ice Sheet History

This JR expedition will recover sediment cores and log data from six drill sites in the eastern Ross Sea offshore western Antarctica. Study of the obtained samples and data will help understand the evolution of the Western Antarctic Ice Sheet (WAIS) over the past 20 million years, including its response to changes in ocean heat flux. This expedition has implications for ice sheet stability and assessing far-field sea-level rise from the current warming trend observed in the Southern Ocean over the past several decades.

Recently Completed (January 2018): Creeping Gas Hydrate Slides and Hikurangi LWD

This JR expedition offshore New Zealand collected logging-while-drilling (LWD) data and core samples that will be used to explore the relationship between gas hydrate deposits and submarine landslides, a significant geohazard,   Additionally, Expedition 372 carried out advance work for the upcoming expedition to the Hikurangi subduction zone on New Zealand's eastern boundary by collecting LWD data in advance of coring and downhole measurements.  

Recently Completed (December 2017): Corinth Active Rift Development

This expedition recovered sedimentary sequences at three sites in the Gulf of Corinth using the mission-specific platform Fugro Synergy.  Further study of these sediment cores will help understand how continental rifting leads to the formation of ocean basins, and will also provide details about the fault system associated with the active rift, its history, and current geohazard potential.  press release  *  blog  *  reports

Recently Completed (November 2017): Australia Cretaceous Climate and Tectonics

This JR expedition off southwest Australia recovered samples recovered from the Naturaliste Plateau and adjacent sedimentary Mentelle Basin to study the formation and collapse of the Cretaceous hothouse Earth, how ocean anoxic events are related to carbon perturbations, deep water formation during the Cretaceous, the influence of ocean circulation gateways around the Australian continent, and details of how plate motions have affected deposition of sediments in this area. Reports

Recently Completed (September 2017): Tasman Frontier Subduction Initiation and Paleogene Climate

In this JOIDES Resolution expedition, six seafloor sites in the complex region of the Tasman Sea between Australia and New Zealand, sometimes referred to as Zealandia, were cored and logged to infer the timing and geometry of subduction initiation along the Tonga Kermadec Arc approximately 50 million years ago, which is the largest subduction initiation event identified in plate tectonics. The recovered sediments will provide constraints on how the beginning of subduction here changed ocean conditions and connections between the polar ocean to the south and more tropical regions to the north.  

Recently Completed (June 2017): South China Sea Rifted Margin

In a pair of expeditions to the South China Sea aboard the JOIDES Resolution, scientists explored the mechanisms of lithosphere extension during continental breakup by drilling four sites across a 300-km wide zone of highly extended, seaward thinning crust. The expedition cored through thick sedimentary sections to look for serpentinized mantle in the underlying continent-ocean-transition basement zone, which has implications for competing models of plate rupture. Study of the sedimentary sections obtained will constrain the timing of rifting, rate of extension, and crustal subsidence that resulted the present-day South China Sea, leading to a new understanding of how marginal basins begin and grow. daily reports

Recently Completed (February 2017): Mariana Convergent Margin

Expedition 366 to the western Pacific Ocean aboard the JOIDES Resolution investigated the geochemistry, tectonics, and biology in an active subduction zone by coring the summits and flanks of serpentinite mud volcanoes on the forearc of the Mariana system, a non-accretionary convergent plate margin. Re-entry cones were installed in cased boreholes at three sites to provide infrastructure for future installation of long-term borehole monitoring systems. The sediment, rock, and fluid samples obtained during this expedition will be used to understand mass transport and geochemical cycling, track the spatio-temporal variability of subduction-related fluids and water-rock interactions, and study how physical properties and dehydration might control seismicity in non-accretionary convergent forearc systems.