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
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Ocean Hemisphere Research Center
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NNoorrmmaall OOcceeaanniicc MMaannttllee ((NNOOMMaann)) PPrroojjeecctt
PIs: H. Utada, H. Kawakatsu, H. Shiobara, K. Baba, T. Isse, D. Suetsugu
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The NOMan Project (FY2010-2014):
(1) Lithosphere/asthenosphere system (2) Water (volatiles) in the transition zone
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Lithosphere/Asthenosphere system
Deep Sea Borehole seismometer installed by
OHP
Kawakatsu et al. (Science, 2009)
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Korenaga & Korenaga (2008)
What/where is normal ?
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BBBBOOBBSS OOBBEEMM
BBBBOOBBSS--NNXX
EEFFOOSS
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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
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Pilot deployment (2010/6~2012/8)
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Area A
Area B
Main deployment (2012/8-2014/8@A; 2011/11-2013/8-2014/8@B)
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preliminary results: skipped
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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
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BB dispersion analysis of OBS data in PHS
Takeo et al. (2013, JGR)
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Takeo et al. (2013, JGR)
BB dispersion analysis of OBS data in PHS
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BB dispersion analysis of OBS data in PHS Takeo et al. (2013, JGR)