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  • 1
    Monograph available for loan
    Multiscale Seismic Tomography (2015)
    Tokyo : Springer Japan
    Details
    Call number: M 17.90963
    Description / Table of Contents: This book on multiscale seismic tomography, written by one of the leaders in the field, is suitable for undergraduate and graduate students, researchers, and professionals in Earth and planetary sciences who need to broaden their horizons about seismotectonics, volcanism, and interior structure and dynamics of the Earth and Moon. It describes the state-of-the-art in seismic tomography, with emphasis on the new findings obtained by applying tomographic methods in local, regional, and global scales for understanding the generating mechanism of large and great earthquakes such as the 2011 Tohoku-oki earthquake (Mw 9.0), crustal and upper mantle structure, origin of active arc volcanoes and intraplate volcanoes including hotspots, heterogeneous structure of subduction zones, fate of subducting slabs, origin of mantle plumes, mantle convection, and deep Earth dynamics. The first lunar tomography and its implications for the mechanism of deep moonquakes and lunar evolution are also introduced
    Type of Medium: Monograph available for loan
    Pages: XV, 304 p. 146 illus., 117 illus. in color
    ISBN: 9784431553595 , 9784431553601 (ebook)
    Series Statement: Springer Geophysics
    URL: Cover
    DOI: 10.1007/978-4-431-55360-1
    Language: English
    Note: IntroductionMethodology of Seismic Tomography -- Subduction Zone Tomography -- Large Earthquakes and Seismotectonics -- Hotspots and Mantle Plumes -- East Asia Structure and Tectonics -- Global Tomography and Deep Earth dynamics -- Seismic Tomography of the Moon..
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    E-BOOK
  • 2
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    Three-dimensional seismic structure beneath Shillong Plateau and Assam Valley, northeast India (1998)
    In:  Bull. Seism. Soc. of America, Amsterdam, Univ. Tokyo, vol. 88, no. 3, pp. 667-676, pp. L14309, (ISSN: 1340-4202)
    Details
    Publication Date: 1998
    Keywords: Three dimensional ; Earth model, also for more shallow analyses ! ; Velocity depth profile ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    The 2001 Bhuj earthquake: Tomographic evidence for fluids at the hypocenter and its implications for rupture nucleation (2002)
    In:  Geophys. Res. Lett., Amsterdam, Univ. Tokyo, vol. 29, no. 24, pp. 5-1 to 5-4, pp. 2152, (ISSN: 1340-4202)
    Details
    Publication Date: 2002
    Keywords: Earthquake ; Fluids ; Tomography ; Source ; GRL ; 7209 ; Seismology: ; Earthquake ; dynamics ; and ; mechanics ; 7205 ; Continental ; crust ; (1242) ; 7223 ; Seismic ; hazard ; assessment ; and ; prediction ; 7230 ; Seismicity ; and ; seismotectonics ; 6982 ; Radio ; Science: ; Tomography ; and ; imaging ; Seismology
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    BIBLIOGRAPHY SEISMOLOGY
  • 4
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    Seismic evidence for dehydration embrittlement of the subducting Pacific slab (2004)
    In:  Geophys. Res. Lett., Luxembourg, Conseil de l'Europe, vol. 31, no. 9, pp. 1421-1424, pp. L09610, (ISSN: 1340-4202)
    Details
    Publication Date: 2004
    Keywords: Rock mechanics ; Mineralogy ; Plate tectonics ; Subduction zone ; Source ; Seismicity ; Seismology ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 5
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    The 1995 Kobe earthquake: Seismic image of the source zone and its implications for the rupture nucleation (1998)
    In:  Journal of Geophysical Research, Kunming, China, 3-4, vol. 103, no. B5, pp. 9967-9986, pp. B05301, (ISSN: 1340-4202)
    Details
    Publication Date: 1998
    Keywords: Earthquake ; Fracture ; Source ; JGR
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    BIBLIOGRAPHY SEISMOLOGY
  • 6
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    Mantle transition zone structure beneath the Changbai volcano: Insight into deep slab dehydration and hot upwelling near the 410-km discontinuity (2016)
    Wiley
    Details
    Publication Date: 2016-07-15
    Description: We study the detailed mantle transition zone structure beneath the active Changbai intraplate volcano in Northeast China using a receiver-function method. A total of 3005 teleseismic receiver functions recorded by 70 broadband stations are obtained by using a common-conversion-point stacking method. For conducting the time-to-depth conversion, we use a three-dimension velocity model of the study region so as to take into account the influence of structural heterogeneities. Our results reveal significant depth variations of the 410, 520 and 660-km discontinuities. A broad depression of the 410 km discontinuity and a low-velocity anomaly are revealed beneath the Changbai volcano, which may reflect a large-scale hot mantle upwelling around the 410 km discontinuity with a positive Clapeyron slope. The 520 km discontinuity is identified clearly and its uplift occurs above the stagnant Pacific slab. We also find a prominent depression of the 660 km discontinuity, which is elongated along the trend of deep-earthquake clusters in a range of 39°N ~ 44°N latitude, and the depression area has a lateral extent of about 400 km. Because the 520 and 660 km discontinuities correspond to positive and negative Clapeyron slopes, respectively, we think that the 520 uplift and the 660 depression are caused by the cold subducting Pacific slab. A part of the Pacific slab may have penetrated into the lower mantle and so caused the large-scale 660 depression in front of the deep-earthquake clusters. Our results also reveal a part of the upper boundary of the subducting Pacific slab in the mantle transition zone.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 7
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    On the trade-off between seismic anisotropy and heterogeneity: Numerical simulations and application to Northeast Japan (2015)
    Wiley
    Details
    Publication Date: 2015-04-09
    Description: P-wave tomography has been recently used to study 3-D azimuthal and radial anisotropy of subduction zones and continental regions. However, the fundamental issue about the trade-off between the isotropic and anisotropic structures is still unclear. In this study, we investigate this issue systematically with comprehensive synthetic tests. Our results indicate that good ray coverage in the azimuth (for azimuthal anisotropy) and incidence (for radial anisotropy) is required for determining reliable anisotropic models. The isotropic and anisotropic structures are strongly coupled and smearing effects are significant when the rays used in the inversion are limited in a small range of azimuth or incidence. We therefore plot ray-azimuth and ray-incidence ellipses at every grid nodes and propose to use the normalized length of the short-axis (NLS; i.e., the ratio of the short-axis and long-axis lengths) for estimating the ray coverage quantitatively. Applying our novel approach to a large number of high-quality arrival-time data of local shallow and intermediate-depth earthquakes, we obtained new tomographic images of 3-D P-wave azimuthal and radial anisotropy in Northeast Japan. Both the azimuthal and radial anisotropy results are determined reliably for the shallow parts of the study region, whereas the smearing effects are significant in the deeper part of the mantle wedge and the subducting slab. Our results show dominant trench-normal and vertical-fast anisotropy in the mantle wedge while trench-parallel and horizontal-fast anisotropy in the subducting slab, which indicates different dynamics in different domains of the subduction zone.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 8
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    Seismic tomography and anisotropy of the Helan-Liupan tectonic belt: Insight into lower crustal flow and seismotectonics (2016)
    Wiley
    Details
    Publication Date: 2016-03-26
    Description: We determined detailed 3-D P- and S-wave velocity (Vp, Vs) and Poisson's ratio (σ) images as well as P-wave azimuthal anisotropy in the crust and uppermost mantle beneath the Helan-Liupan tectonic belt (HLTB) and adjacent regions. The data set used in this study consists of 38,880 P-wave and 35,117 S-wave arrival times from 5,028 local earthquakes recorded by 66 seismic stations in the study area during 1980 to 2014. Obvious low-Vp and low-σ anomalies are revealed in the lower crust beneath the Qilian Orogenic Belt and Western Qinling, which we interpret as a weakened zone mainly caused by water and capable of ductile flow on a geological timescale. Our P-wave anisotropy results suggest that the flow direction in the lower crust is nearly parallel to the direction of the geodetic crustal motion and that of the upper mantle flow beneath the study region. Most of the 26 large historical earthquakes (1125-1954) in the study region occurred in the boundary zones where Vp, Vs and σ change drastically over a short distance. Beneath the source areas of the large historical earthquakes, fluid-related low-velocity zones exist widely in the lower crust. The fluids result from dehydration of hydrous minerals in the deeper crust and uppermost mantle beneath the northeastern Tibetan Plateau. When the fluids migrate upward to the active faults, the fault-zone friction is reduced and so large crustal earthquakes can be triggered. Our present results shed new light on the seismogenesis and geodynamics of the northeastern Tibetan Plateau and adjacent areas.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 9
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    Seismic Anisotropy Evidence for Ductile Deformation of the Forearc Lithospheric Mantle in Subduction Zones (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract Seismic anisotropy provides important information on the structure and geodynamics of the Earth. The forearc mantle wedge in subduction zones mainly exhibits trench‐parallel azimuthal anisotropy globally, which is inconsistent with the model of olivine a axis aligning with the slab‐driven corner flow. Its formation mechanism is currently unclear. Here we present high‐resolution 3‐D P wave anisotropic tomography of the Tohoku subduction zone. We suggest that ductile deformation of the forearc lithospheric mantle of the overriding plate induces the trench‐parallel azimuthal anisotropy and positive radial anisotropy (i.e., horizontal velocity 〉 vertical velocity) in Tohoku. Our results provide the first seismic anisotropic evidence for the slab‐mantle decoupling at a common depth of ~70 km. On the basis of the high‐resolution seismic images, we propose a geodynamic model suggesting that the forearc mantle wedge anisotropy is produced via ductile deformation of dry olivine or hydrous antigorite lithospheric mantle, which accords well with the trench‐parallel shear wave splitting measurements dominant in subduction zones globally.
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 10
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    Structural Heterogeneity and Anisotropy in the Source Zone of the 2018 Eastern Iburi Earthquake in Hokkaido, Japan (2019)
    Wiley
    Details
    Publication Date: 2019
    Description: Abstract We investigate 3‐D seismic structures (Vp, Vs, and Poisson's ratio) and Vp azimuthal anisotropy in the source area of the 2018 Eastern Iburi earthquake (M 6.7) in Hokkaido, Japan. Its mainshock occurred at the edge of a high‐Vp (2–4%) seismogenic zone. Significant low‐Vs (−1% to −3%) and high Poisson's ratio (2–7%) anomalies are imaged in and below the source zone and extend to the upper surface of the subducting Pacific slab, most likely reflecting ascending fluids released by the slab dehydration. A high consistency between the fault plane and the low‐Vs and high Poisson's ratio anomalies indicates that the fluids may have entered the fault and affected the rupture nucleation. A high‐V (1–3%) anomaly is revealed in the fore‐arc mantle wedge and connects with the high‐V seismogenic zone, probably reflecting a lithospheric fragment and contributing to cool down the mantle wedge. Complex seismic anisotropy is revealed in the crust in and around the source area, which may reflect complicated stress regime and strong structural heterogeneities there.
    Print ISSN: 2169-9313
    Electronic ISSN: 2169-9356
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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