Japan to collect first samples of Earth’s mantle

An ambitious Japanese-led project to dig deeper into the Earth’s surface than ever before will be a breakthrough in detecting earthquakes, including Tokyo’s dreaded ”Big One”, officials said on Thursday.

The deep-sea drilling vessel Chikyu made a port call on Thursday in Yokohama after ending its first training mission at sea since being built in July at a cost of $500-million.

The 57 500-tonne Chikyu, which means ”the Earth” in Japanese, is scheduled to embark in September 2007 on a voyage to collect the first samples of the Earth’s mantle in human history.

The project, led by Japan and the United States with the participation of China and the European Union, seeks clues on primitive organisms that were the forerunners of life and on the tectonic plates that shake the planet’s foundations.

”This is like an Apollo project under the Earth,” staff scientist Kan Aoike said, referring to the landmark US lunar missions.

”The idea of the project came out half-a-century ago but failed halfway while the real Apollo project was carried out successfully,” Aoike said as he sorted out samples taken in its first training voyage.

”So this is a second and serious attempt to complete another key exploration for mankind,” he said. ”We are so excited to witness the mantle for the first time.”

The Earth is made up of a crust, a mantle, an outer core and an inner core.

The satellite-equipped vessel, which still smells fresh with paint, is equipped with a 121m drill tower that can dig 7 000m below the seabed, nearly three times as deep as its predecessors.

”All these [samples] give us different ideas for how the climate changed over time, the position of the continents, what kind of land plants were living on the Earth, what’s the potential for oil,” said Daniel Curewitz, a US scientist working on the project.

But Asahiko Taira, director general of the project, said: ”For Japan, the most important thing is to drill through areas where plates are overlapping so that we can monitor an earthquake directly.

”I presume this will help predict an earthquake, which will be a breakthrough in seismology,” he said. ”Even if we cannot predict it, we can get data in advance of an initial crack from an earthquake.”

Japan experiences 20% of the world’s major earthquakes.

As a first drilling spot, the operator chose the seabed about 600km south-west of Tokyo, where many experts say an earthquake measuring eight on the Richter scale will occur sometime in the near future.

In 1944 and 1946, more than 2 000 people in total were killed in two big earthquakes and tsunami in the seabed area known as the Nankai Trough, a boundary where two plates slide past each other.

Taira said the seabed off Sumatra island in Indonesia, the scene of the massive earthquake a year ago that triggered the Indian Ocean tsunami, is also a potential drilling spot in the future.

Oceanic drilling is preferred over land drilling because the crust at the seabed is thinner and allows for deeper digs into the crust and mantle, Taira said.

Chikyu uses technology that exists for oil drilling, but is specially equipped to prevent damage from sudden bursts if it accidentally strikes oil or gas reserves.

About 150 crew members are scheduled to make the first official voyage in 2007. The ship and its drill pipes are rigged to stay stable by adjusting to the rolling motions from the drilling and waves. — Sapa-AFP

We make it make sense

If this story helped you navigate your world, subscribe to the M&G today for just R30 for the first three months

Subscribers get access to all our best journalism, subscriber-only newsletters, events and a weekly cryptic crossword.”

Shingo Ito
Shingo Ito
Dr. Shingo Ito is Assistant Professor in Division of Chemistry and Biological Chemistry (CBC), School of Physical and Mathematical Sciences (SPMS) since April 2018. He received his B.Sc. (2003), M.Sc. (2005), and Ph.D. (2008) degrees from Department of Chemistry, Graduate School of Science, The University of Tokyo, Japan. He was appointed to Assistant Professor (2008-2017) and Lecturer (2017-2018) at Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, Japan. Representative awards he received include Mitsui Chemicals Catalysis Science Award of Encouragement (2016), The Chemical Society of Japan Award for Young Chemists (2017), and The Young Scientists’ Prize, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, Japan (2018).

Related stories


Already a subscriber? Sign in here


Latest stories

Russia’s invasion of Ukraine could be firestarter of global economic...

Developed countries could do much to help counterparts in the developing world weather the current storm

A female condom can take sexual pleasure to new heights

Internal condoms not only offer protection, they increase the user’s control and the rings tickle the clitoris and penis

Zuma corruption trial on hold as court waits for word...

The Pietermaritzburg high court was surprised by the delay in Bloemfontein but said it would likely not be the last

SA’s endemic corruption requires a ‘biting’ response

Beneficial ownership transparency (BOT) can help tackle corruption, reduce investment risk and improve national and global governance, but implementation remains ‘a sad story’

press releases

Loading latest Press Releases…