Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS...

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Toward in-situ Characterization of Lithosphere/Asthenosphere System of the "Normal Oceanic" Mantle: The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators: A. Takeo, T. Isse, H. Shiobara, H. Utada, K. Baba

Transcript of Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS...

Page 1: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Toward in-situ Characterization of Lithosphere/Asthenosphere System of

the "Normal Oceanic" Mantle: The NOMan Project

2013/10/22 @ OBS WS

Hitoshi KAWAKATSU Earthquake Research Institute

the University of Tokyo

Collaborators: A. Takeo, T. Isse, H. Shiobara, H. Utada, K. Baba

Page 2: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Ocean Hemisphere Research Center

Page 3: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

NNoorrmmaall OOcceeaanniicc MMaannttllee ((NNOOMMaann)) PPrroojjeecctt

PIs: H. Utada, H. Kawakatsu, H. Shiobara, K. Baba, T. Isse, D. Suetsugu

Page 4: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

The NOMan Project (FY2010-2014):

(1) Lithosphere/asthenosphere system (2) Water (volatiles) in the transition zone

Page 5: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Lithosphere/Asthenosphere system

Deep Sea Borehole seismometer installed by

OHP

Kawakatsu et al. (Science, 2009)

Page 6: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Korenaga & Korenaga (2008)

What/where is normal ?

Page 7: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

BBBBOOBBSS OOBBEEMM

BBBBOOBBSS--NNXX

EEFFOOSS

Page 8: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Project schedule

FY2010 FY2011 FY2012 FY2013 FY2014

Conventional BBOBS OBEM

New BBOBS-NX EFOS

JAMSTEC cruise

Private cruise

Tohoku EQ

Present

Pilot dep

1y-delay

Page 9: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Pilot deployment (2010/6~2012/8)

Page 10: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Area A

Area B

Main deployment (2012/8-2014/8@A; 2011/11-2013/8-2014/8@B)

Page 11: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

preliminary results: skipped

Page 12: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Summary: preliminary

- not all “normal mantle” look normal - broadband surface wave dispersion

- LID with ~constant velocity - depth dependent anisotropy (RA>AA?) - w/RF, SKS-splitting

- variability sedimentary noise in deep ocean - final recovery++ cruise @ summer, 2014 -  symposium @ Feb/March, 2015 - post-doc position

Page 13: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

BB dispersion analysis of OBS data in PHS

Takeo et al. (2013, JGR)

Page 14: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

Takeo et al. (2013, JGR)

BB dispersion analysis of OBS data in PHS

Page 15: Earthquake Research Institute the University of Tokyo · The NOMan Project 2013/10/22 @ OBS WS Hitoshi KAWAKATSU Earthquake Research Institute the University of Tokyo Collaborators:

BB dispersion analysis of OBS data in PHS Takeo et al. (2013, JGR)


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