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Proceedings of the Japan Academy, Ser. B, Physical and Biological Sciences

Vol. 86 No. 8 (2010)

  Vol. 86 No. 8 (2010)
Caption
 
Reviews
Gravity at sea —A memoir of a marine geophysicist—
Yoshibumi TOMODA
Proc. Jpn. Acad., Ser. B, Vol. 86, 769-787 (2010) [abstract] [PDF]
The selective elimination of messenger RNA underlies the mitosis–meiosis switch in fission yeast
Masayuki YAMAMOTO
Proc. Jpn. Acad., Ser. B, Vol. 86, 788-797 (2010) [abstract] [PDF]
Our trails and trials in the subsarcolemmal cytoskeleton network and muscular dystrophy researches in the dystrophin era
Eijiro OZAWA
Proc. Jpn. Acad., Ser. B, Vol. 86, 798-821 (2010) [abstract] [PDF]
Reflections on my career in analytical chemistry and biochemistry
Charles C. SWEELEY
Proc. Jpn. Acad., Ser. B, Vol. 86, 822-836 (2010) [abstract] [PDF]
Development of fluorescent probes for bioimaging applications
Tetsuo NAGANO
Proc. Jpn. Acad., Ser. B, Vol. 86, 837-847 (2010) [abstract] [PDF]
Molecular biology of histidine decarboxylase and prostaglandin receptors
Atsushi ICHIKAWA, Yukihiko SUGIMOTO and Satoshi TANAKA
Proc. Jpn. Acad., Ser. B, Vol. 86, 848-866 (2010) [abstract] [PDF]
Cover Illustration
Cover Illustration: Mapping of marine gravity anomalies

A map of free-air gravity anomalies in the northwestern Pacific compiled and painted in 1982 by the late Prof. Yoshibumi Tomoda, M.J.A. The gravity anomalies in the northwestern Pacific are critical to the understanding of how oceanic plates sink into the deep interior of the Earth, a key process of plate tectonics called “subduction”. Such a vertical motion of materials is associated with large anomalies in mass distribution that can be detected by gravity measurements. Prof. Tomoda developed a unique sea surface gravity-meter and operated it throughout this region (and beyond) to obtain high-resolution gravity anomaly maps such as shown here. Through these high-resolution measurements, Prof. Tomoda and his colleagues discovered that subtle features such as seamounts or faults (transform faults) have large influence on the way in which oceanic plate subducts. These results have important implications for our understanding of fundamental scientific questions such as how plate tectonics occurs but also for practical questions such as how and where submarine earthquakes may occur.
An arrow shows the location of Tomoda seamount named after Prof. Tomoda. It is located to the east of Minami Torishima (Marcus Island). They are part of the Marcus-Wake seamount chain formed during the Cretaceous. Prof. Tomoda investigated the interaction of seamounts and ocean trenches through high-resolution marine gravity measurements.

Hiromi Fujimoto
Research Center for Production of Earthquakes and Volcanic Eruptions, Tohoku University

Shun-ichiro Karato
Department of Geology and Geophysics, Yale University

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