Abstract
standing the dynamics, physical properties, and structure of ing the dynamics, physical properties, and structure of the dynamics, physical properties, and structure of an active fault. We drilled into the four major active faults in four major active faults in major active faults in central and western Japan to directly access mechanics, physical properties, and fault rock distributions in and around the fault zones—the Nojima fault (which appeared by the Nojima fault (which appeared by Nojima fault (which appeared by (which appeared by which appeared by the 1995 Hyogo-ken Nanbu Earthquake, M7.2, also called , also called also called also called
Highlights
Fault zone drilling provides valuable insights in to u n d e r stand in g t h e d y n a m i c s, p h y s i c a l p r o p e r t i e s, a n d s t r u c t u r e o f an active fault
By the in s it u stress measurements, we found the differential stress magnitude decreases in the depth close to fracture zones in the Neodani fault (1300 - m - d e e p w e l l ; I k e d a et al, 1996) and the Nojima fault (1800 - m - d e e p w e l l ; I k e d a e t al., 2001a)
We found the orientations of the maximum horizontal compressive stress were nearly perpendicular to the fault strikes of th e N o ji m a F a u lt ( I k e d a e t a l ., 2 0 0 1 a )
Summary
Fault zone drilling provides valuable insights in to u n d e r stand in g t h e d y n a m i c s , p h y s i c a l p r o p e r t i e s , a n d s t r u c t u r e o f an active fault. We measured in s i t u stress magnitude and direction in and around a fault zone by hydraulic fracturing and borehole breakout method.
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