NEHRP Clearinghouse

Title
Permeability and Strength of Core Samples from the Nojima Fault of the 1995 Kobe Earthquake.
File
PB2006113763.pdf
Author(s)
Lockner, D.; Naka, H.; Tanaka, H.; Ito, H.; Ikeda, R.
Source
January 2006, 10 p.
Abstract
The 1995 Hyogoken-Nanbu (Kobe) earthquake, M=7.2, ruptured the Nojima fault. We have studied core samples taken from two scientific drillholes which crossed the fault zone in the epicentral region on Awagi island. The shallower hole, drilled by the Geological Survey of Japan (GSJ), was started 75m to the SE of the surface trace of the Nojima fault and crossed the fault at a depth of 624m. A deeper hole, drilled by the National Research Institute for Earth Science and Disaster Prevention (NIED) was started 302m to the SE of the fault and crossed fault strands below a depth of 1140m. We have measured strength and matrix permeability of core samples taken from these two drillholes.
Keywords
; Permeability; Drillholes; Core samples; Nojima fault; Fault zones; Seismic effects; Strength; Kobe earthquake; Epicentral region; Awagi island