6-7. Study on Crustal Resistivity Structure
The crustal resistivity structure is investigated in areas of high seismic
and volcanic activities. The
results from seismically active areas indicate a relation between distribution
of microearthquakes
and/or deap seated active faults and crustal resistivity. In volcanic
areas, investigations aim to clarify
the relations between ground water distribution and precursory signal
generation, depth to magma
source and features of volcanic eruption.
Fig.1. Sites of resistivity structure investigations performed by research
group for resistivity structure.
図２．奥羽脊Fig.2. 2-D resistivity cross section determined by analysis
of wide-band MT survey performed at Ou Backbone Range and Dewa Hills.
Also shown are seismicity data after Umino et al.(2000) (circles), S-wave
reflectors (squares) & P-wave scatterers (stars)determined by Asano(1998),
seismic relection result after Hirata et al.(1999), and seismic refraction
result after Iwasaki et al.(1999).
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