Three-dimensional attenuation structure beneath the northeastern Japan arc estimated from spectra of small earthquakes

Tsumura, Noriko; Matsumoto, Satoshi; Horiuchi, Shigeki; Hasegawa, Akira

doi:10.1016/s0040-1951(99)00297-8

Cited by 157 publications

(121 citation statements)

References 28 publications

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“…The location and geometry of low-Q zones in the mantle wedge agree with those of low-V anomalies imaged by tomography at a depth of the uppermost mantle, although they cross with the NE Japan arc at a depth of 60 -80 km ( Fig. 16d: Yoshida et al 1999b;Tsumura et al 2000). Tsumura et al (2000) have shown that the distribution of the mantle wedge low-Q zones is different in the southwestern part compared with the northeastern part of NE Honshu.…”

Section: Along-arc Mantle Heterogeneitysupporting

confidence: 66%

“…Attenuation tomography reveals the low-attenuation (high-Q) subducting Pacific slab and the highattenuation (low-Q) anomalies in the crust and mantle wedge (Umino & Hasegawa 1984;Tsumura et al 2000). The location and geometry of low-Q zones in the mantle wedge agree with those of low-V anomalies imaged by tomography at a depth of the uppermost mantle, although they cross with the NE Japan arc at a depth of 60 -80 km ( Fig.…”

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 60%

“…16d: Yoshida et al 1999b;Tsumura et al 2000). Tsumura et al (2000) have shown that the distribution of the mantle wedge low-Q zones is different in the southwestern part compared with the northeastern part of NE Honshu. In the southwestern part (west of the TTL), low-Q zones are located beneath the active volcanoes or the volcanic front, and are continuously distributed from the crust to the mantle wedge, deepening westward.…”

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 99%

“…In contrast, several low-Q zones exist in the northeastern part (east of the TTL), and appear isolated from each other. They are located just beneath the active volcanoes at shallower depths, and deepen to the west of the volcanic front (Tsumura et al 2000). Q-Values in the mantle wedge vary not only across the arc, but also along the arc (Tsumura et al 2000).…”

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 99%

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Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

et al. 2013

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Abstract:We review the evolution of late Cenozoic magmatism in the NE Japan arc, and examine the relationship between the magmatism and the crust-mantle structure. Recent studies reveal secular changes in the mode of magmatic activity, the magma plumbing system, erupted volumes and magmatic composition associated with the evolution of crust-mantle structures related to the tectonic evolution of the arc. The evolution of Cenozoic magmatism in the arc can be divided into three periods: the continental margin (66-21 Ma), the back-arc basin (21-13.5 Ma) and the island-arc period (13.5-0 Ma). Magmatic evolution in the back-arc basin and the island-arc periods appears to be related to the 2D to 3D change in the convection pattern of the mantle wedge related to the asthenosphere upwelling and subsequent cooling of the mantle. Geodynamic changes in the mantle caused back-arc basin basalt eruptions during the back-arc basin opening (basalt phase) followed by crustal heating and re-melting, which generated many felsic plutons and calderas (rhyolite/granite phase) in the early stage of the island-arc period. This was followed by crustal cooling and strong compression, which ensured vent connections and mixing between deeper mafic and shallower felsic magmas, erupting large volumes of Quaternary andesites (andesite phase).Gold Open Access: This article is published under the terms of the CC-BY 3.0 license.The NE Japan arc is a typical island arc associated with a cold subduction zone. It is one of the most well-known island arcs on Earth and provides a useful model for our understanding of how subduction zones produce magmas, including andesites. The NE Japan arc is related to the westward

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Section: Along-arc Mantle Heterogeneitysupporting

confidence: 66%

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 60%

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 99%

Section: Along-arc Mantle Heterogeneitymentioning

confidence: 99%

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Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

et al. 2013

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“…Low Q P and Q S values in the upper mantle are commonly associated with the mantle wedge in active subduction zones, instead of the cold oceanic subducting lithosphere where substantially higher Q values are found [e.g., Wiens et al, 2008]. Q P M and Q S M for Southern Spain are similar to those measured in the mantle wedge of subduction zones like Andes [Schurr et al, 2003;Badi et al, 2009], Marianas [Pozgay et al, 2009], Philippines sea-Izu Bonin subduction [Shito and Shibutan, 2003], Japan arc [Tsumura et al, 2000] and Costa Rica and Nicaragua [Rychert et al, 2008].…”

Section: Resultsmentioning

confidence: 85%

Q_P and Q_S in the upper mantle beneath the Iberian peninsula from recordings of the very deep Granada earthquake of April 11, 2010

Mancilla

Pezzo

Stich

et al. 2012

Geophysical Research Letters

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[1] Granada (Southern Spain) is a place of rare and enigmatic very deep focus earthquakes, the last one on April 11, 2010, with magnitude of 6.3 and depth of 620 km. We use regional broadband recordings to estimate Q P and Q S in the mantle for frequencies between 0.25 and 8 Hz, computing the spectra of the direct P-and S-waves with their early P-and S coda. We use the spectral decay method, constraining crustal Q to values given in the literature. We obtain robust estimates of Q P in 6 frequency bands (0.25, 0.5,1, 2, 4 and 8 Hz) and of Q S in 4 bands (0.25, 0.5,1, 2 Hz). Q P in the mantle ranges from 13 at 0.25 Hz to 346 at 8 Hz and Q S from 59 at 0.25 to 183 at 2 Hz. The frequency dependence is well fitted by Q = Q 0 f a with a equal to 0.6 for Q S and 1.0 for Q P , and Q 0 equal to 109 for Q S and 63 for Q P . The Q P /Q S ratio is less than 1. These are extreme values within the ranges of mantle Q, Q P /Q S and a values reported in the literature, indicating strong scattering attenuation and absence of melt. We propose that such values, rather than being an exception, may approximate the average upper mantle, with solid olivine composition and small-scale heterogeneity.

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Seismic attenuation beneath northeastern Japan: Constraints on mantle dynamics and arc magmatism

et al. 2013

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[1] We apply a three-step approach to estimate three-dimensional (3-D) P wave attenuation (Q p À1 ) structure beneath northeastern Japan. First, corner frequencies of earthquakes are determined using the spectral-ratio method for S-coda waves. Then, whole-path attenuation terms, t*, and site-amplification factors are simultaneously estimated by a joint inversion. The set of t* is finally inverted for 3-D attenuation structure. The results show that the mantle wedge has low attenuation in the fore arc and high attenuation in the back arc. A depth profile of Q p À1 in the back-arc mantle is explained by attenuation expected for a two-dimensional (2-D) thermal model with Q p /Q s = 2 and grain sizes of 1 and 3 cm. However, an inclined high-attenuation zone observed in the back-arc mantle wedge, which is interpreted as an upwelling flow, shows higher attenuation than that calculated from the 2-D thermal model. The higher seismic attenuation is probably caused by the concentration of partial melt in the upwelling flow. A combined interpretation of seismic attenuation and velocity structures further suggests that the degree of partial melt in the upwelling flow varies along the arc and that volcanoes are clustered transverse to the arc, below which the upwelling flow contains a higher degree of melt. These observations indicate that magmatism is controlled by a mantle-wedge process that depends strongly on spatial variations in the degree of partial melt in the upwelling flow. Our results further imply the breakdown of hydrous minerals in a hydrous layer above the Pacific plate at a depth of~120 km.

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Three-dimensional attenuation structure beneath the northeastern Japan arc estimated from spectra of small earthquakes

Cited by 157 publications

References 28 publications

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Q_P and Q_S in the upper mantle beneath the Iberian peninsula from recordings of the very deep Granada earthquake of April 11, 2010

Seismic attenuation beneath northeastern Japan: Constraints on mantle dynamics and arc magmatism

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Three-dimensional attenuation structure beneath the northeastern Japan arc estimated from spectra of small earthquakes

Cited by 157 publications

References 28 publications

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

Evolution of late Cenozoic magmatism and the crust–mantle structure in the NE Japan Arc

QP and QS in the upper mantle beneath the Iberian peninsula from recordings of the very deep Granada earthquake of April 11, 2010

Seismic attenuation beneath northeastern Japan: Constraints on mantle dynamics and arc magmatism

Contact Info

Product

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Q_P and Q_S in the upper mantle beneath the Iberian peninsula from recordings of the very deep Granada earthquake of April 11, 2010