Abstract
The Northern Fossa Magna is a Miocene failed rift and due to subsequent shortening, its basin-fill forms a fold-belt associated with active faults. Seismic reflection data across the middle part of the northern Fossa Magna acquired in late 1990s were reprocessed to reveal the deep geometry of active faults. The reprocessed seismic sections portray the folded and faulted structure of the Neogene basin-fill. The deeper extension of the Western Nagano Basin active Fault (WNBF), which has been revealed for the first time, can be traced down to 4 km, as a reverse fault dipping 40° westward. In the western part, the Itoigawa-Shizuoka Tectonic Line (ISTL) active fault is presented as an emergent thrust dipping 30–35° eastward. Based on the seismic profiles, surface geology and well data, the balanced geologic cross section was constructed. Using simple-shear model of the basin formation, the total amount of Miocene extension is calculated to be ca. 27 km and the total amount of late Neogene to Quaternary shortening is ca. 11 km. The basin formation and shortening deformation are well explained by the tectonic inversion model and fault reactivation.
Article PDF
Similar content being viewed by others
References
Asano, S., K. Ichikawa, H. Okada, S. Kubota, H. Suzuki, M. Nogoshi, H. Watanabe, K. Seya, K. Noritomi, and K. Tazime, Explosion seismic observations in the Matsushiro Earthquake Swarm Area, Spec. Rep. Geol. Survey of Japan, 5, Part I, 1–162, 1969.
Ikami, A., T. Yoshii, S. Kubota, Y. Sasaki, A. Hasemi, T. Moriya, H. Miyamachi, R. Matsu’ura, and K. Wada, A seismic refraction profile in and around Nagano Prefecture, Central Japan, J. Phys. Earth, 34, 457–474, 1986.
Ikeda, Y., T. Imaizumi, M. Togo, K. Hirakawa, T. Miyauchi, and H. Sato (eds.), Atlas of Quaternary Thrust Faults in Japan, Univ. of Tokyo Press, Tokyo, 254 pp., 2002 (in Japanese).
Kato, H., Fossa Magna—A masked border region separating southwest and northeast Japan, Bull. Geol. Surv. Japan, 43, 1–30, 1992.
Kato, H. and S. Akahane, Geology of the Nagano District. Quadrangle Series Scale 1:50000, Geol. Surv. Japan, 122 pp., 1986 (in Japanese with English Abstract).
Kato, H., K. Mimura, T. Sato, and F. Takizawa, Geology of the Omachi District Quadrangle Series, Scale 1:50000, Geol. Surv. Japan, 111 pp., 1989 (in Japanese with English Abstract).
Matsuta, N., Y. Ikeda, and H. Sato, The slip-rate along the northern Itoigawa-Shizuoka tectonic line active fault system, central Japan, Earth Planets Space, 56, this issue, 1325–1332, 2004.
McClay, K. R., Glossary of thrust tectonics terms, in Thrust Tectonics, edited by K. R. McClay, 447 pp., Chapman & Hall, London, 1992.
Morishita, A., J. Oguro, K. Sawai, K. Tanaka, S. Tanaka, and M. Uji, Geology of the southern part of Hijiri-yama, Nagano PrefectureOn the stratigraphy of the so-called ‘Tochiku Facies’ in the Ogawa Formation, Jour. Geol. Soc. Japan, 63, 159–166. 1957 (in Japanese with English abstract).
Oishi, K., A. Okada, and T. Nohara, Late Holocene faulting of the active faults along the western margin of the Nagano Basin based on the drilling survey at Nakano city, Nagano Prefecture, central Japan, Active Fault Research, 20, 52–58, 2001 (in Japanese with English abstract).
Saito, Y., A preliminary note on the structure-system of the Tertiary Formations in the northern part of the Fossa Magna, Bull. Fac. Educ. Shinshu Univ., 12, 99–108, 1961 (in Japanese with English abstract).
Sakai, S., T. Iwasaki, T. Iidaka, T. Yoshii, F. Yamazaki, and T. Kuwayama, The structure of the crust of Chubu region from the explosion observation, Earth Monthly, 18, 104–108, 1996 (in Japanese).
Sato, H., The relationship between late Cenozoic tectonic events and stress field and basin development in northeast Japan, J. Geophys. Res., 99, 22261–22274, 1994.
Sato, H. and N. Hirata, Deep geometry of active faults and the evolution of Japanese islands, Kagaku (Science), 68, 63–71, 1998 (in Japanese).
Sato, H. and Y. Ikeda, Major fault systems in northern Honshu, Japan, Earth Monthly, 21, 569–575, 1999a (in Japanese).
Sato, H., T. Iwasaki, S. Kawasaki, Y. Ikeda, N. Matsuta, T. Takeda, N. Hirata, and T. Kawanaka, Formation and shortening deformation of a back-arc rift basin revealed by deep seismic profiling, central Japan, Tectonophysics, 388, 47–58, 2004a.
Sato, H., T. Yoshida, T. Iwasaki, T. Sato, Y. Ikeda, and N. Umino, Late Cenozoic tectonic development of the back arc region of central northern Honshu, Japan, revealed by recent deep seismic profiling, J. Jpn. Assoc. Petrol. Tech., 69, 145–154, 2004b (in Japanese with English abstract).
Takano, O., Changes in depositional systems and sequences in response to basin evolution in a rifted and inverted basin: An example from the Neogene Niigata-Shin’etsu basin, Northern Fossa Magna, central Japan, Sedimentary Geology, 152, 79–97, 2002.
Takeda, T., H. Sato, T. Iwasaki, N. Matsuta, S. Sakai, T. Iidaka, and A. Kato, Crustal structure in the northern Fossa Magna region, central Japan, modeled from refraction/wide-angle reflection data, Earth Planets Space, 56, this issue, 1295–1301, 2004.
Tanaka, K., Geology in the upper stream of Aida River in the middle part of Nagano Prefecture, Bull. Fac. Educ. Shinshu Univ., 12, 267–276, 1958 (in Japanese with English abstract).
Tearpock, D. J. and R. E. Bischke, Applied Subsurface Geological Mapping, Prentice-Hall, Inc, 811 pp., 1991.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Elouai, D., Sato, H., Hirata, N. et al. Deep seismic reflection profiling across the Northern Fossa Magna: The ERI 1997 and the JNOC 1996 seismic lines, active faults and geological structures. Earth Planet Sp 56, 1331–1338 (2004). https://doi.org/10.1186/BF03353358
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1186/BF03353358