Masaaki Kimura (木村政昭, November 6, 1940, Yokohama - ) is a Professor Emeritus from the Faculty of Science of the University of the Ryukyus, Okinawa, Japan. Some of his theories, such as the location of the ancient Yamatai Kingdom, the theory for earthquake prediction and the interpretation of the Yonaguni Monument, are controversial.
Masaaki Kimura graduated in science at the Faculty of Fisheries of the University of Tokyo (1963) and obtained a Doctorate in marine geology (1968). He has worked for the University of Tokyo's Ocean Research Institute, the Geological Survey of Japan, the Agency of Industrial Science and Technology of the Ministry of International Trade and Industry of Japan, and Columbia University's Lamont-Doherty Earth Observatory. He taught at the University of the Ryukus from 1977 to 2002. He has since retired from that University and is now general director of Marine Science and Culture Heritage Research Association.
His specialties are marine geology, geophysics, seismology, volcanology, and marine archaeology. He has extensively researched the formation of the Okinawa Trough, and claimed to have predicted the volcanic eruptions in Miyake Island (1983), Izu Ōshima (1986), and Mount Unzen (1991).
Apart from his geological research, Kimura is best known to the world for his exploration of underwater structures which he claims are ruins of an ancient civilization. These structures were identified by local divers in 1988. In 1992 he studied the so-called Yonaguni Monument and other formations off the coast of Yonaguni, the westernmost of the Ryukyus, on which he has become the leading expert. In a report given to the 21st Pacific Science Congress in 2007 he suggested that it had been built 2,000 to 3,000 years ago as the sea level then was close to current levels.
- Kimura, Masaaki (1976). "Major Magmatic Activity as a Key to Predicing Large Earthquakes Along the Sagami Trough, Japan". Nature 260 (5547): 131. Bibcode:1976Natur.260..131K. doi:10.1038/260131b0.
- Geological Structure of the Izu Ogasawara Arc and Trench. 1976.
- Significant Eruptive Activities Related to Large Interplate Earthquakes in the Northwestern Pacific Margin. 1978.
- Volcanism and Seismicity in the Kyushu and Ryukyu Islands Areas. 1978.
- Submarine Geology around the Southern Ryukyu Islands, with Special Reference to the Okinawa Trough. 1979.
- Submarine Tectonics Around the Japanese Islands, with Special Reference to Tectonics of the Sagami Trough. 1979.
- "Backarc Volcanism and rifting in the Okinawa trough". Marine and Petroleum Geology. 1981.
- Formation of the Okinawa Trough. 1985.
- Okinawa Trough genesis: structure and evolution of a backarc basin developed in a continent. 1985.
- Back Arc Rifting in the Okinawa Trough. 1986.
- Okinawa Trough Genesis: Structure and Evolution of a Backarc Basin Developed in a Continent. 1986.
- Origin of the Okinawa Trough. 1986.
- The Okinawa Trough : Genesis of a Back arc Basin Developing Continental Margin. 1986.
- Sibuet, Jean-Claude; Masaaki Kimura et al. (1987). "Back arc extension in the Okinawa Trough". Journal of Geophysical Research 92 (B13): 14041–14063. Bibcode:1987JGR....9214041S. doi:10.1029/JB092iB13p14041.
- Geostructure of the Okinawa Trough. 1988.
- "Submarine Geology of the Nansei Islands". Modern Geology. 1988.
- Major and trace element chemistry and D/H, 18O/16O, 87Sr/86Sr and 143Nd/144Nd ratios of rocks from the spreading center of the Okinawa Trough, a marginal back arc basin. 1991.
- Morphology and Geology of the Magellan Trough Area in the Central Pacific. 1992.
- Origin of the Magnetic Anomalies in the Southern Okinawa Trough. 1992.
- Relationship between the West Pacific Rift System and mid oceanic ridges. 1992.
- Tectonic Evolution of the East China Sea and the Okinawa Trough. 1992.
- Science on Eruptions and Earthquakes. Ronso-sha. 1993.
- Volcanic Belts and Volcano-Tectonic Structure of the East Asia. Geological Committee for Mineral Resources of the Russian Federation Government Far Eastern Research Institute of Raw Materials. 1993.
- Prediction of the shock. Seishun-shuppan. 1994.
- Active Rift System in the Okinawa Trough and Its Northeastern Continuation. 1995.
- "Quaternary Paleo-Geography of the Ryukyu Arc". Journal of Geography 105 (3). 1996.
- Construction and breakup of the Ryukyu Landbridge and their tectonic implications as derived from precise bottom topography and regional gravity anomaly in the southwestern part of the Japanese islands. 1996.
- Neotectonic development of the Okinawa Trough and the Ryukyu Arc. 1996.
- Kimura, Masaaki (1996). "Ryukyu in the Late Quaternary". Journal of Geography 105 (3): 261–268. Unknown parameter
- Seismicity and Crustal Movement of Ryukyu Arc. 1997.
- Surface Deformation and Origin of Large Scale Tsunami in the Southwesternmost Part of the Ryukyu Arc. 1997.
- A Continent Lost in the Pacific Ocean - Riddle of the Submarine Ruins in the Ryukyu Islands - Tokyo 1998
- Geochemical and Sr Nd isotopic characteristics of volcanic rocks from the Okinawa Trough and Ryukyu Arc: Implications for the evolution of a young, intracontinental back arc basin. 1999.
- Ancient Megalithic Construction Beneath the Sea off Ryukyu Islands in Japan, Submerged by Post Glacial Sea level Change. 2004.
- Statistical analysis of time distance relationship between volcanic eruptions and great earthquakes in Japan. 2004.
- Frequency Attribute Study of Seismic Data. 2005.
- The Mid Niigata Prefecture Earthquake in 2004: A view from Statistical Analysis. 2005.
- "New topographic map of the southwestern Okinawa Trough". Shinkai Shinpojiumu Yokoshu 21: 115–116. 2005.
- Submarine, across arc normal fault system in the southwest Ryukyu Arc: trigger of the 1771 tsunami hazard?. 2006.
- Diving Survey Report for Submarine Ruins Off Yonaguni, Japan
- Masaaki Kimura. "Sunken Citadel off Yonaguni Island". Ancient American 6 (39).
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