Featured Research

from universities, journals, and other organizations

Core Samples From Subsea Fault System Off Japan Will Help Explain How Earthquakes Are Generated

Date:
February 11, 2008
Source:
Integrated Ocean Drilling Program Management International
Summary:
Scientists aboard IODP scientific drilling vessel Chikyu collected 5,000 samples from the seismogenic zone known as the Nankai Trough. The samples will provide scientists with new sources of data and the potential for increased understanding of how earthquakes are generated.

Sky, ocean, Chikyu, and scientists: Kitty Milliken (University of Texas, U.S.) and Arito Sakaguchi(JAMSTEC, Japan).
Credit: Copyright JAMSTEC/IODP

The third expedition of the Integrated Ocean Drilling Program's Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) completed its mission off the Kii Peninsula February 4. 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.


Story Source:

The above story is based on materials provided by Integrated Ocean Drilling Program Management International. Note: Materials may be edited for content and length.


Cite This Page:

Integrated Ocean Drilling Program Management International. "Core Samples From Subsea Fault System Off Japan Will Help Explain How Earthquakes Are Generated." ScienceDaily. ScienceDaily, 11 February 2008. <www.sciencedaily.com/releases/2008/02/080205125248.htm>.
Integrated Ocean Drilling Program Management International. (2008, February 11). Core Samples From Subsea Fault System Off Japan Will Help Explain How Earthquakes Are Generated. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2008/02/080205125248.htm
Integrated Ocean Drilling Program Management International. "Core Samples From Subsea Fault System Off Japan Will Help Explain How Earthquakes Are Generated." ScienceDaily. www.sciencedaily.com/releases/2008/02/080205125248.htm (accessed July 31, 2014).

Share This




More Earth & Climate News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Visitors Feel Part of the Pack at Wolf Preserve

Visitors Feel Part of the Pack at Wolf Preserve

AP (July 31, 2014) Seacrest Wolf Preserve on the northern Florida panhandle allows more than 10,000 visitors each year to get up close and personal with Arctic and British Columbian Wolves. (July 31) Video provided by AP
Powered by NewsLook.com
Big Waves In Arctic Ocean Threaten Polar Ice

Big Waves In Arctic Ocean Threaten Polar Ice

Newsy (July 30, 2014) Big waves in parts of the Arctic Ocean are unprecedented, mainly because they used to be covered in ice. Video provided by Newsy
Powered by NewsLook.com
Raw: Thousands Flocking to German Crop Circle

Raw: Thousands Flocking to German Crop Circle

AP (July 30, 2014) Thousands of people are trekking to a Bavarian farmer's field to check out a mysterious set of crop circles. (July 30) Video provided by AP
Powered by NewsLook.com
Weather Kills 2K A Year, But Storms Aren't The Main Offender

Weather Kills 2K A Year, But Storms Aren't The Main Offender

Newsy (July 30, 2014) Health officials say 2,000 deaths occur each year in the U.S. due to weather, but it's excessive heat and cold that claim the most lives. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



    Save/Print:
    Share:

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile: iPhone Android Web
    Follow: Facebook Twitter Google+
    Subscribe: RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins