Magnetotelluric transect across the Niigata-Kobe Tectonic Zone, central Japan: A clear correlation between strain accumulation and resistivity structure

R. Yoshimura, N. Oshiman, M. Uyeshima, H. Toh, T. Uto, H. Kanezaki, Y. Mochido, K. Aizawa, Y. Ogawa, T. Nishitani, S. Sakanaka, M. Mishina, H. Satoh, T. Goto, T. Kasaya, S. Yamaguchi, H. Murakami, T. Mogi, Y. Yamaya, M. HaradaI. Shiozaki, Y. Honkura, S. Koyama, S. Nakao, Y. Wada, Y. Fujita

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We obtained an electrical transect image of the Niigata-Kobe Tectonic Zone (NKTZ). Several major active faults are located in this zone of concentrated deformation. The main features of the final two-dimensional model are a thick resistive block in the upper crust, with a thinned-out portion beneath the Atotsugawa Fault, and a strong conductor in the lower crust that intrudes upward into the upper resistor. The upper crustal resistive zone corresponds well to the spatiality of the NKTZ, and relatively conductive zones sandwiching this resistor may contribute to observed changes in displacement rates. The overlapping locations of the conductor and the low-velocity body in the lower crust indicate that the conductor represents a zone that was weakened by fluids. Given that microearthquakes are localized in the regions between the resistive and conductive zones, we suggest that the distribution of earthquakes is influenced by intrusions of fluid derived from the conductor.

Original languageEnglish
Article numberL20311
JournalGeophysical Research Letters
Volume36
Issue number20
DOIs
Publication statusPublished - Oct 1 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint Dive into the research topics of 'Magnetotelluric transect across the Niigata-Kobe Tectonic Zone, central Japan: A clear correlation between strain accumulation and resistivity structure'. Together they form a unique fingerprint.

  • Cite this

    Yoshimura, R., Oshiman, N., Uyeshima, M., Toh, H., Uto, T., Kanezaki, H., Mochido, Y., Aizawa, K., Ogawa, Y., Nishitani, T., Sakanaka, S., Mishina, M., Satoh, H., Goto, T., Kasaya, T., Yamaguchi, S., Murakami, H., Mogi, T., Yamaya, Y., ... Fujita, Y. (2009). Magnetotelluric transect across the Niigata-Kobe Tectonic Zone, central Japan: A clear correlation between strain accumulation and resistivity structure. Geophysical Research Letters, 36(20), [L20311]. https://doi.org/10.1029/2009GL040016