Navigation Links
Scientists obtain core samples from subsea fault system off Japan

The third expedition of the Integrated Ocean Drilling Programs Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) completed its mission off the Kii Peninsula today. The expedition science party, 26 scientists representing 10 countries, set forth on Dec. 19, 2007, aboard the drilling vessel Chikyu, to evaluate the deformation, structural partitioning, and physical characteristics of the Nankai Trough fault zone. The expedition was led by co-chief scientists Elizabeth Screaton of University of Florida, and Gaku Kimura of University of Tokyo. The investigators successfully drilled and cored 13 boreholes in the fault zone.

We collected more than 5,000 samples from the cores for further examination, notes Dr. Screaton. The resulting data will provide important new constraints on models of the evolution of the subduction zone and its relationship to earthquake and tsunami generation. The Nankai Trough, a geological trench approximately 770 kilometers long, stretches from the Suruga Bay to where the Philippine Sea Plate slips (subducts) under southwest Japan. Along this subduction zone, sediment on the underlying tectonic plate continuously scrapes off and adds material to the overriding plate, forming new geological sediments called the accretionary prism. Understanding the deformation within the accretionary prism and its fault zones is an important factor in understanding how earthquakes are generated and why some earthquakes cause disturbance at the seafloor that leads to tsunamis, Screaton explains.

Expedition scientists examined the sediments ranging from the youngest on the slope overlying the accretionary prism, through fault zones and into sediments underneath the megasplay fault and frontal thrust. According to Dr. Kimura, even the youngest sediments have an important story to tell. The sediments provide information about past slope failures, explains Kimura, which may relate to past megasplay movement and earthquakes, and which may cause tsunamis. Megasplay refers to large faults that branch off the major plate boundary, to near the seafloor.

IODP Expedition 316 was implemented by the Center for Deep Earth Exploration of the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). CDEX/JAMSTEC is one of three organizations that implement expeditions on behalf of IODP, managing operations aboard Chikyu.

Chikyu is scheduled to depart from the port of Shingu on Feb. 12 to deliver the core samples to the Kochi Core Center, one of three IODP repositories that archive sediment samples. NanTroSEIZE investigations will continue with Expedition 320 in Fall 2008.

Contact: Nancy Light
Integrated Ocean Drilling Program Management International

Related biology news :

1. Scientists discover new species of giant elephant-shrew
2. Scientists outline novel approach to ecosystem management
3. Scientists achieve major genetics breakthrough
4. In nature -- and maybe the corner office -- scientists find that generalists can thrive
5. Using DNA, scientists hunt for the roots of the modern potato
6. Ecologists, material scientists pursue genetics of diatoms elegant, etched casing
7. In diatom, scientists find genes that may level engineering hurdle
8. Scientists call for urgent research into real impacts of invasive species
9. Scientists discover a new player in innate immune response
10. Scientists study the link between childrens nutrition and adult diseases
11. Scientists associate 6 new genetic variants with heart disease risk factor
Post Your Comments:
(Date:6/2/2016)... 2, 2016   The Weather Company , an IBM ... an industry-first capability in which consumers will be able to ... ask questions via voice or text and receive relevant information ... Marketers have long sought an advertising solution that ... be personal, relevant and valuable; and can scale across millions ...
(Date:5/24/2016)... care by providing unparalleled technology to leaders of the medical imaging industry.  As such, ... to the range of products distributed by Ampronix. Photo - ... ... ... With ...
(Date:5/12/2016)... May 12, 2016 , a ... the overview results from the Q1 wave of its ... wave was consumers, receptivity to a program where they ... a health insurance company. "We were surprised ... says Michael LaColla , CEO of Troubadour Research, ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... , ... June 27, 2016 , ... ... for Amgen, will join the faculty of the University of North Carolina ... professor of strategy and entrepreneurship at UNC Kenan-Flagler, with a focus on the ...
(Date:6/27/2016)... BOSTON , June 27, 2016   Ginkgo ... biology to industrial engineering, was today awarded as ... a selection of the world,s most innovative companies. ... at scale for the real world in the ... organism engineers work directly with customers including Fortune ...
(Date:6/24/2016)... SAN DIEGO , June 24, 2016 /PRNewswire/ ... that more sensitively detects cancers susceptible to PARP ... individual circulating tumor cells (CTCs). The new test ... of HRD-targeted therapeutics in multiple cancer types. ... therapies targeting DNA damage response pathways, including PARP, ...
(Date:6/24/2016)... ... 24, 2016 , ... Researchers at the Universita Politecnica delle Marche in Ancona ... or pleural mesothelioma. Their findings are the subject of a new article on the ... are signposts in the blood, lung fluid or tissue of mesothelioma patients that can ...
Breaking Biology Technology: