Masato Koyama's recent papers

• Koyama, M. (1999): Pre-20th century of earthquake swarms and volcanic activity in the Higashi Izu monogenetic volcano field, based on historical documents. The Quaternary Res., 38, 435-446 (in Japanese with English abstract).
• Koyama, M. (1999): A review of historical seismology in Japan: analyses and proposals for next stage of study of historical documents. J. Geogr., 108, 346-369 (in Japanese with English abstract).
• Koyama, M., and Hayakawa, Y. (1999): A beginner's guide to "shiryo" (historical documents) seismology and volcanology. J. Geogr., 108, 489-494 (in Japanese with English abstract).
• Nagasawa, C., Sasaki, S., and Koyama, M. (1998): Change of stress field in Beta-Atla-Themis region on Venus, estimated from surface geometry of dike swarms, lava stratigraphy, and crater density. Geophysical Research Letters , 25, 4429-4432.
• Koyama, M. (1998): Reevaluation of the eruptive history of Fuji Volcano, Japan, mainly based on historical documents. Bull. Volcanol. Soc. Japan, 43, 323-347. (in Japanese with English abstract).
• Koyama, M. (1998): Reevaluation of the 800-802 A.D. eruption of Fuji Volcano, Japan, and its influence on the ancient traffic network around the volcano, base on eruptive deposits and historical records. Bull. Volcanol. Soc. Japan, 43, 349-371. (in Japanese with English abstract).
• Hayakawa, Y., and Koyama, M. (1998): Dates of two major eruptions from Towada and Baitoushan in the 10th century. Bull. Volcanol. Soc. Japan, 43, 403-407. (in Japanese with English abstract).
• Hayakawa, Y. and Koyama, Masato (1997): Which calendar shall we adopt to describe dates of volcanic eruptions older than 1582 AD, the Gregorian or the Julian? J. Geogr., 107, 102-104 (in Japanese).
  
• Nagasawa, C., Koyama, M., and Sasaki, S. (1996): Mapping of crustal stress field on Venus from surface geometry of dike swarms: temporal change of stress field in Beta-Atla-Themis Regio. Proceedings of the 29th ISAS Lunar and planetary symposium (ed. Mizutani, H.), Institute of Space and Astronautical Science, Sagamihara, pp. 71-74.
  
• Koyama, Masato, and Hayakawa, Y. (1996): Syn- and post-caldera eruptive history of Izu Oshima Volcano based on tephra and loess stratigraphy. J. Geogr., 105, 133-162 (in Japanese with English abstract).
  
• Kobayashi, M., and Koyama, M. (1996): Tephrochronology on the western and southern foots of Hakone Volcano, Japan. J. Geogr., 105, 431-447 (in Japanese with English abstract).
  
• Koyama, Masato (1995): Reevaluation of the West Sagami Bay Fracture and seismotectonics in and around the northwestern Sagami Bay, Japan. J. Geogr., 104, 45-68. (in Japanese with English abstract).
  
• Koyama, Masato, Hayakawa, Y., and Arai, F. (1995): Eruptive history of the Higashi-Izu monogenetic volcano field 2: mainly on volcanoes older than 32,000 years ago. Bull. Volcanol. Soc. Japan, 40, 191-209. (in Japanese with English abstract).
  
• Kotake, N., Koyama, Masato, and Kameo, K. (1995): Magnetostratigraphy and biostratigraphy of the Plio-Pleistocene Chikura and Toyofusa Groups, southernmost part of the Boso Peninsula, central Japan. J. Geol. Soc. Japan, 101, 515-531 (in Japanese with English abstract).
  
• Koyama, Masato (1994): A rule-based expert system for geological study and education: A prototype for estimating emplacement mechanisms of volcaniclastic rocks. Geoinformatics, 5, 85-92 (in Japanese with English abstract).
  
• Koyama, Masato, Kogita, S., Oishi, Y., Shoji, H., and Ishido, A. (1994): Knowledge structure and estimate method of formative processes of geologic terrane and its bearing mineral resources: An example of uranium resources and their mother terranes. Geoinformatics, 5, 55-69 (in Japanese with English abstract).
  
• Niitsuma, N., and Koyama, Masato (1994): Paleomagnetic processor: A fully automatic portable spinner magnetometer combined with an AF-demagnetizer and magnetic susceptibility anisotropy meter. Geosci. Repts. Shizuoka Univ., no.21, 11-19 (in Japanese with English abstract).
  
• Koyama, Masato, and Yohida, Y. (1994): Relationship between eruptive history and crustal stress field based on cumulative changes in magma discharge from volcanoes. Bull. Volcanol. Soc. Japan, 39, 177-190 (in Japanese with English abstract).
  
• Koyama, Masato (1994): Late Quaternary-present tectonics in the northernmost area of the Izu-Bonin volcanic arc. J. Geogr., 103, 576-590 (in Japanese with English abstract).
  
• Takagi, K., Aoike, K., and Koyama, Masato (1993): What happened on the northern tip of the Izu-Bonin arc during 15-10 Ma? J. Geogr., 102, 252-263 (in Japanese with English abstract).
  
• Koyama, Masato (1993): Volcanism and tectonics of the Izu Peninsula, Japan. Kagaku (Science), 63, 312-321 (in Japanese).
  
• Koyama, Masato (1993): Preliminary eruptive history of the 800-802 eruption of Fuji Volcano based on eruptive deposits and historical documents: Did the ancient Tokaido pass across the northern foot of Mt. Fuji? Historical Earthquakes, no.9, 9-34 (in Japanese).
  
• Koyama, Masato, Cisowski, S.M., and Pezard, P. (1992): Paleomagnetic evidence for northward drift and clockwise rotation of the Izu-Bonin arc since the early Oligocene. Proc. ODP, Scientific Results, 126, College Station, Texas (Ocean Drilling Program), pp.353-370.
  
• Koyama, Masato, Cisowski, S.M., and Gill, J.B. (1992): Paleomagnetic estimate of emplacement mechanisms of deep basaltic volcaniclastic rocks in the Sumisu Rift, Izu-Bonin arc. Proc. ODP, Scientific Results, 126, College Station, Texas (Ocean Drilling Program), pp.371-379.
  
• Cisowski, S.M., and Koyama, Masato (1992): Detailed record of the Brunhes/Matuyama polarity reversal in high sedimentation rate marine sediments from the Izu-Bonin arc. Proc. ODP, Scientific Results, 126, College Station, Texas (Ocean Drilling Program), pp.341-352.
  
• Fujioka, K., Matsuo, Y., Nishimura, A., Koyama, Masato, and Rodolfo, K. (1992): Tephras of the Izu-Bonin forearc (Sites 787, 792, and 793). Proc. ODP, Scientific Results, 126, College Station, Texas (Ocean Drilling Program), pp.47-74.
  
• Hayakawa, Y., and Koyama, Masato (1992): Eruptive history of the Higashi Izu monogenetic volcano field 1: 0-32 ka. Bull. Volcanol. Soc. Japan, 37, 167-181 (in Japanese with English abstract).
  
• Koyama, Masato (1992): Possibility of simultaneous occurrence of eruptions and great earthquakes around the northern edge of the Philippine Sea plate. The Earth Monthly, extra no. 5, 137-144 (in Japanese).
  
• Koyama, Masato (1992): Discovery of explosive lava fountaining in the deep bathyal basin of the Izu-Bonin backarc rift: A paleomagnetic result of ODP Leg 126. The Earth Monthly, extra no. 6, 201-205 (in Japanese).
  
• Fujioka, K., Nishimura, A., Koyama, Masato, Kaiho, K., and Tazaki, K. (1992): Drilling across the Izu-Bonin arc 2. The Earth Monthly, extra no. 6, 195-200 (in Japanese).
  
• Koyama, M., Niitsuma, N., Kano, K., Takagi, K., Uchimura, R., Yoshida, T., Karasawa, Y., and Tanabe, H. (1992): Geology and tectonics of the eastern cliff along the Suruga trough axis: Results from Dive 579 of the submersible "Shinkai 2000". Proc. JAMSTEC symp. Deep Sea Res., 145-161 (in Japanese with English abstract).
  
• Koyama, Masato, and Umino, S. (1991): Why does the Higashi-Izu monogenetic volcano group exist in the Izu Peninsula? Relationships between late Quaternary volcanism and tectonics in the northern tip of the Izu-Bonin arc. J. Phys. Earth, 39, 391-420.
  
• Umino, S., Kato, M., and Koyama, Masato (1991): Diversity of parent magmas of Higashi-Izu monogenetic volcano group. J. Phys. Earth, 39, 371-389.
  
• Tamura, Y., Koyama, Masato, and Fiske, R.S. (1991): Paleomagnetic evidence for hot pyroclastic debris flow in the shallow submarine Shirahama Group (upper Miocene-Pliocene), Japan. J. Geophys. Res., 96, 21779-21787.
  
• Koyama, Masato (1990): Tectonic evolution of the Philippine Sea plate based on paleomagnetic results. J. Geogr., 100, 628-641 (in Japanese with English abstract).
  
• Taylor, B., Fujioka, K., and ODP Leg 126 Shipboard Scientific Party (1990): Proc. ODP, Init. Repts., 126, College Station, Texas (Ocean Drilling Program).
  
• Gill, J., Torssander, P., Lapierre, H., Taylor, R., Kaiho, K., Koyama, Masato, Kusakabe, M., Aitchison, J., Cisowski, S., Dadey, K., Fujioka, K., Klaus, A., Lovell, M., Marsaglia, K., Pezard, P., Taylor, B., and Tazaki, K. (1990): Explosive deep water basalt in the Sumisu backarc rift. Science, 248, 1214-1217.
  
• Kikawa, E., Koyama, Masato, and Kinoshita, H. (1989): Paleomagnetism of Quaternary volcanics in the Izu Peninsula and adjacent areas, Japan, and its tectonic significance. J. Geomag. Geoelectr., 41, 175-201.
  
• Koyama, Masato, and Kitazato, H. (1989): Paleomagnetic evidence for Pleistocene clockwise rotation in the Oiso Hills: A possible record of interaction between the Philippine Sea plate and northeast Japan, In Deep Structure and Past Kinematics of Accreted Terranes, (ed. J. W. Hillhouse), Geophys. Monogr., 50, American Geophysical Union, Washington, pp.249-265.
  
• Koyama, Masato (1989): Paleomagnetic studies in the South Fossa Magna and adjacent areas. Modern Geol., 14, 69-86.
  
• ODP Leg 126 Shipboard Scientific Party (1989): Arc volcanism and rifting. Nature, 342, 18-20.
  
• Fujioka, K., Taylor, B., Nishimura, A., Koyama, Masato, Kaiho, K., Tazaki, K., Janecek, T., and scientific party of Leg 126 (1989): Drilling across the Izu-Bonin arc -results of ODP Leg 126 cruise-. J. Geogr., 98, 886-910 (in Japanese with English abstract).