Resistivity structure across Itoigawa-Shizuoka tectonic line and its implications for concentrated deformation

Details Resistivity structure across Itoigawa-Shizuoka tectonic line and its implications for concentrated deformation Resistivity structure across Itoigawa-Shizuoka tectonic line and its implications for concentrated deformation

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ep%26s...54.1115o&link_type=abstract

Earth, Planets and Space, Volume 54, p. 1115-1120.

Physics

4

Scientific paper

We investigated the deep crustal resistivity structure across Itoigawa-Shizuoka Tectonic Line (ISTL), one of the most dangerous active intraplate faults in Japan, by use of wide-band magnetotelluric (MT) method. The 28 MT stations were aligned perpendicular to the ISTL. A two-dimensional model was created in transverse magnetic (TM) mode where electric currents flow in N60°W-N120°E directions. The model showed good correlations with the surface geology. In particular, we found a thick (~6 km) surface conductor to the east of ISTL which corresponds to the heavily folded sedimentary layer. The Japan Alps to the west of the ISTL is characterized by the resistive upper crust, where the pre-Tertiary rocks crop out. The Japan Alps is underlain by a conductor below 15-20 km depth, which is consistent with the low seismic velocity anomaly. We also found a localized shallow conductor corresponding to the Mt. Tateyama volcano. The most important feature is the conductor in the mid-crust directly under the area of active folding to the east of the ISTL. This may imply a localized zone of fluids because of the enhanced porosity in a shear zone. The recent seismicity clusters in the resistive crust underlain by the conductor, and this suggests the fluid involvement in earthquake generation processes.

Affiliated with

Also associated with

No associations

Rating

Resistivity structure across Itoigawa-Shizuoka tectonic line and its implications for concentrated deformation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Resistivity structure across Itoigawa-Shizuoka tectonic line and its implications for concentrated deformation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Resistivity structure across Itoigawa-Shizuoka tectonic line and its implications for concentrated deformation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-737588