Crustal heterogeneity beneath southwest Japan estimated from direct and Moho-reflected waves

Salah, Mohamеd K.; Zhao, Dapeng; Lei, Jianshe; Abdelwahed, Mohamed F.

doi:10.1016/j.tecto.2004.08.005

Cited by 15 publications

(15 citation statements)

References 36 publications

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“…Table 1 shows the initial velocity model used in the tomographic inversion. It is generally similar to the models used previously by other researchers in SW. Japan (e.g., Zhao and Negishi, 1998;Zhao et al, 2000a;Zhao, 2003a,b, 2004;Salah et al, 2005). Velocities at grid nodes are taken as unknown parameters and the velocity at any point in the model is calculated by linearly interpolating the velocities at the eight grid nodes surrounding that point.…”

Section: Methodsmentioning

confidence: 99%

Imaging of Vp, Vs, and Poisson’s ratio anomalies beneath Kyushu, southwest Japan: Implications for volcanism and forearc mantle wedge serpentinization

Salah

Seno

2008

Journal of Asian Earth Sciences

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Section: Methodsmentioning

confidence: 99%

Imaging of Vp, Vs, and Poisson’s ratio anomalies beneath Kyushu, southwest Japan: Implications for volcanism and forearc mantle wedge serpentinization

Salah

Seno

2008

Journal of Asian Earth Sciences

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“…The spectrum of the ligand shows strong bands at 3699, 3429, 3234, 1728, 1601, 1444, 1342 and 1288 cm -1 that are assigned to the ν(OH) carboxyl, ν(OH) phenolic, ν(NH), ν(C=N), ν(COO) asymmetrical, ν(N=N), ν(COO) symmetrical and ν(CO) phenolic respectively [25][26][27] . On complex formation the bands of ν(C=N), ν(N=N) and ν(COO) are shifted to lower frequencies by (39 to 44 ), (8 to 18 ) and ( 3 to 8 ) cm -1 respectively; these shifts confirm the coordination of the ligand through the nitrogen of the azomethine group, and the azo group and the carboxylate ion with the metal ions.…”

Section: Infrared Spectra Studiesmentioning

confidence: 99%

NEW AZO-SCHIFF BASE DERIVED WITH Ni(II), Co(II), Cu(II), Pd(II) AND Pt(II) COMPLEXES: PREPARATION, SPECTROSCOPIC INVESTIGATION, STRUCTURAL STUDIES AND BIOLOGICAL ACTIVITY

Al‐Hamdani

Balkhi

Falah

et al. 2015

J. Chil. Chem. Soc.

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The coordination ability of the azo-Schiff base 2-[1,5-Dimethyl-3-[2-(5-methyl-1H-indol-3-yl)-ethyl imino]-2-phenyl-2,3-dihydro-1H-pyrazol-4-ylazo]-5-hydroxy-benzoic acid has been proven in complexation reactions with Co(II), Ni(II), Cu(II), Pd(II) and Pt(II) ions. The free ligand (LH) and its complexes were characterized using elemental analysis, determination of metal concentration, magnetic susceptibility, molar conductivity, FTIR, Uv-Vis, (1H, 13C) NMR spectra, mass spectra and thermal analysis (TGA). The results confirmed the coordination of the ligand through the nitrogen of the azomethine, Azo group (Azo) and the carboxylate ion with the metal ions. The activation thermodynamic parameters, such as ΔE*, ΔH * , ΔS * , ΔG * and K are calculated from the TGA curves using CoatsRedfern method. Hyper Chem-8 program has been used to predict structural geometries of compounds in the gas phase. The synthesized ligands and their metal complexes were screened for their biological activity against bacterial species, two Gram positive bacteria (Bacillus subtillis and Staphylococcus aureus) and two Gram negative bacteria (Escherichia coli and Pseudomonas aereuguinosa).

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“…Later, detailed tomographic images of the crust and upper mantle under SW Japan were determined, which indicate that fluids at the Kobe hypocenter area originated from the dehydration of the subducting PHS slab under SW Japan (Zhao et al, 2000aSalah and Zhao, 2003b;Salah et al, 2005;Ikeda et al, 2006;Gupta et al, 2009b) (Fig. 38).…”

Section: Anatomy Of Large Crustal Earthquakesmentioning

confidence: 99%

Tomography and Dynamics of Western-Pacific Subduction Zones

Zhao¹

2012

Monogr. Environ. Earth Planets

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We review the significant recent results of multiscale seismic tomography of the Western-Pacific subduction zones and discuss their implications for seismotectonics, magmatism, and subduction dynamics, with an emphasis on the Japan Islands. Many important new findings are obtained due to technical advances in tomography, such as the handling of complex-shaped velocity discontinuities, the use of various later phases, the joint inversion of local and teleseismic data, tomographic imaging outside a seismic network, and P-wave anisotropy tomography. Prominent low-velocity (low-V ) and high-attenuation (low-Q) zones are revealed in the crust and uppermost mantle beneath active arc and back-arc volcanoes and they extend to the deeper portion of the mantle wedge, indicating that the low-V /low-Q zones form the sources of arc magmatism and volcanism, and the arc magmatic system is related to deep processes such as convective circulation in the mantle wedge and dehydration reactions in the subducting slab. Seismic anisotropy seems to exist in all portions of the Northeast Japan subduction zone, including the upper and lower crust, the mantle wedge and the subducting Pacific slab. Multilayer anisotropies with different orientations may have caused the apparently weak shear-wave splitting observed so far, whereas recent results show a greater effect of crustal anisotropy than previously thought. Deep subduction of the Philippine Sea slab and deep dehydration of the Pacific slab are revealed beneath Southwest Japan. Significant structural heterogeneities are imaged in the source areas of large earthquakes in the crust, subducting slab and interplate megathrust zone, which may reflect fluids and/or magma originating from slab dehydration that affected the rupture nucleation of large earthquakes. These results suggest that large earthquakes do not strike anywhere, but in only anomalous areas that may be detected with geophysical methods. The occurrence of deep earthquakes under the Japan Sea and the East Asia margin may be related to a metastable olivine wedge in the subducting Pacific slab. The Pacific slab becomes stagnant in the mantle transition zone under East Asia, and a big mantle wedge (BMW) has formed above the stagnant slab. Convective circulations and fluid and magmatic processes in the BMW may have caused intraplate volcanism (e.g., Changbai and Wudalianchi), reactivation of the North China craton, large earthquakes, and other active tectonics in East Asia. Deep subduction and dehydration of continental plates (such as the Eurasian plate, Indian plate and Burma microplate) are also found, which have caused intraplate magmatism (e.g., Tengchong) and geothermal anomalies above the subducted continental plates. Under Kamchatka, the subducting Pacific slab shortens toward the north and terminates near the Aleutian-Kamchatka junction. The slab loss was induced by friction with the surrounding asthenosphere, as the Pacific plate rotated clockwise 30 Ma ago, and then it was enlarged by the slab-edge pinch-off b...

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Crustal heterogeneity beneath southwest Japan estimated from direct and Moho-reflected waves

Cited by 15 publications

References 36 publications

Imaging of Vp, Vs, and Poisson’s ratio anomalies beneath Kyushu, southwest Japan: Implications for volcanism and forearc mantle wedge serpentinization

Imaging of Vp, Vs, and Poisson’s ratio anomalies beneath Kyushu, southwest Japan: Implications for volcanism and forearc mantle wedge serpentinization

NEW AZO-SCHIFF BASE DERIVED WITH Ni(II), Co(II), Cu(II), Pd(II) AND Pt(II) COMPLEXES: PREPARATION, SPECTROSCOPIC INVESTIGATION, STRUCTURAL STUDIES AND BIOLOGICAL ACTIVITY

Tomography and Dynamics of Western-Pacific Subduction Zones

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