Crustal structure in the northern Fossa Magna region, central Japan, modeled from refraction/wide-angle r reflection data

Details Crustal structure in the northern Fossa Magna region, central Japan, modeled from refraction/wide-angle r reflection data Crustal structure in the northern Fossa Magna region, central Japan, modeled from refraction/wide-angle r reflection data

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ep%26s...56.1293t&link_type=abstract

Earth, Planets and Space, Volume 56, p. 1293-1299.

Mathematics

Logic

5

Scientific paper

The northern Fossa Magna (NFM) is a back-arc rift basin °lled with thick Tertiary sediments, which show strong NW-SE shortening deformation. In the NFM, there exist two major active fault systems, the Itoigawa- Shizuoka Tectonic Line active fault system (ISTL) and the Western Nagano Basin active fault system (WNB), both of which have great potentials to cause destructive earthquakes. By reanalyzing °ve sets of refraction/wideangle re°ection data, we successfully obtained detailed and consistent models of the crustal structure in the NFM region. It was a very effective modeling procedure to incorporate vicinal seismic re°ection data and geologic information. The geometries of the active faults in the NFM region were revealed. The ISTL is east dipping, and the WNB is northwest dipping. The Tertiary sedimentary layer (<4.0 km/sec) west and adjacent to the ISTL extends to a depth of 4-5 km. The basement rocks below the Central Uplift Belt (CUB) form a wedge structure, which suggests the westward movement of the CUB basement rocks.

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