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Your search keyword '"Yoshimitsu, Junko"' showing total 18 results
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18 results on '"Yoshimitsu, Junko"'

6. Persistent Long‐Period Signals Recorded by an OBS Array in the Western‐Central Pacific: Activity of Ambrym Volcano in Vanuatu

Author

Kawano, Yuki, primary, Isse, Takehi, additional, Takeo, Akiko, additional, Kawakatsu, Hitoshi, additional, Suetsugu, Daisuke, additional, Shiobara, Hajime, additional, Sugioka, Hiroko, additional, Ito, Aki, additional, Ishihara, Yasushi, additional, Tanaka, Satoru, additional, Obayashi, Masayuki, additional, Tonegawa, Takashi, additional, and Yoshimitsu, Junko, additional

Published
2020
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7. Seismic evidence for residual mantle underplating the lithosphere beneath the Ontong Java Plateau

Author

Isse, Takehi, primary, Suetsugu, Daisuke, additional, Ishikawa, Akira, additional, Shiobara, Hajime, additional, Sugioka, Hiroko, additional, Ito, Aki, additional, Kawano, Yuki, additional, Yoshizawa, Kazunori, additional, Ishihara, Yasushi, additional, Tanaka, Satoru, additional, Obayashi, Masayuki, additional, Tonegawa, Takashi, additional, and Yoshimitsu, Junko, additional

Published
2020
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8. MOESM1 of High QScS beneath the Ontong Java Plateau

Author

Suetsugu, Daisuke, Shiobara, Hajime, Sugioka, Hiroko, Ito, Aki, Takehi Isse, Ishihara, Yasushi, Tanaka, Satoru, Obayashi, Masayuki, Tonegawa, Takashi, Yoshimitsu, Junko, and Kobayashi, Takumi

Abstract

Additional file 1: Table A1. Qs and travel time residuals estimated from sScS-ScS pairs for the 2016 event. PATS, CHUK, KOSR, OJ09, OJ11, OJ12, OJ13 and MJR are located towards the OJP from the epicenter. Figure A1. Qs obtained from spectral ratio of sScS and ScS phases for the 2016 event (star). Surface bounce points of sScS phase are denoted by crosses. The dotted lines are surface projections of sScS ray paths in the upper 500 km of the mantle. The colors of the symbols and the dotted curves represent Qs values.

Published
2019
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11. The OJP array: seismological and electromagnetic observation on seafloor and islands in the Ontong Java Plateau

Author

Suetsugu, Daisuke, primary, Shiobara, Hajime, additional, Sugioka, Hiroko, additional, Tada, Noriko, additional, Ito, Aki, additional, Isse, Takehi, additional, Baba, Kiyoshi, additional, Ichihara, Hiroshi, additional, Ota, Toyonobu, additional, Ishihara, Yasushi, additional, Tanaka, Satoru, additional, Obayashi, Masayuki, additional, Tonegawa, Takashi, additional, Yoshimitsu, Junko, additional, Kobayashi, Takumi, additional, and Utada, Hisashi, additional

Published
2018
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13. High QScSbeneath the Ontong Java Plateau

Author

Suetsugu, Daisuke, Shiobara, Hajime, Sugioka, Hiroko, Ito, Aki, Isse, Takehi, Ishihara, Yasushi, Tanaka, Satoru, Obayashi, Masayuki, Tonegawa, Takashi, Yoshimitsu, Junko, and Kobayashi, Takumi

Abstract

The Ontong Java Plateau (OJP) in the southwest Pacific is the largest oceanic large igneous provinces (LIP) on Earth. Detailed seismic structure of the plateau has not been understood well because of sparse seismic stations. We investigated seismic attenuation of the mantle beneath the plateau by analyzing data from temporary seismic stations on the seafloor and islands in and around the plateau. We analyzed the spectra of multiple ScS waves to determine the average attenuation of the mantle (QScS) beneath the plateau. We estimated the average QScSvalues for the paths with bounce points located in the plateau to be 309, which is significantly higher than the average (i.e., weaker attenuation than average) estimated in the western Pacific and is close to that of stable continents. We obtained positive residuals of 6 s for travel times of multiple ScS waves, which indicate that the average S velocity in the entire mantle beneath the OJP is low. While the positive residuals are at least partially attributable to the Pacific Large Low Shear Velocity Province (Pacific LLSVP), it is difficult to conclude whether low-velocity anomalies are required in the OJP upper mantle to explain the residuals from the multiple ScS analysis.

Published
2019
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18. High QScS beneath the Ontong Java Plateau.

Author

Suetsugu, Daisuke, Shiobara, Hajime, Sugioka, Hiroko, Ito, Aki, Isse, Takehi, Ishihara, Yasushi, Tanaka, Satoru, Obayashi, Masayuki, Tonegawa, Takashi, Yoshimitsu, Junko, and Kobayashi, Takumi

Subjects
PLATEAUS, ATTENUATION (Physics), FRICTION velocity, IGNEOUS provinces, SEISMIC anisotropy, TIME travel, ROSSBY waves
Abstract

The Ontong Java Plateau (OJP) in the southwest Pacific is the largest oceanic large igneous provinces (LIP) on Earth. Detailed seismic structure of the plateau has not been understood well because of sparse seismic stations. We investigated seismic attenuation of the mantle beneath the plateau by analyzing data from temporary seismic stations on the seafloor and islands in and around the plateau. We analyzed the spectra of multiple ScS waves to determine the average attenuation of the mantle (QScS) beneath the plateau. We estimated the average QScS values for the paths with bounce points located in the plateau to be 309, which is significantly higher than the average (i.e., weaker attenuation than average) estimated in the western Pacific and is close to that of stable continents. We obtained positive residuals of 6 s for travel times of multiple ScS waves, which indicate that the average S velocity in the entire mantle beneath the OJP is low. While the positive residuals are at least partially attributable to the Pacific Large Low Shear Velocity Province (Pacific LLSVP), it is difficult to conclude whether low-velocity anomalies are required in the OJP upper mantle to explain the residuals from the multiple ScS analysis. [ABSTRACT FROM AUTHOR]

Published
2019
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