Multiple damage zone structure of an exhumed seismogenic megasplay fault in a subduction zone - a study from the Nobeoka Thrust Drilling Project

Earth, Planets and Space

Table 1 Values of fracture density and physical properties for each interval in the hanging wall

Interval hanging wall	Depth (mbgs)	Fracture density (number per 1 m)	Porosity (%)	Resistivity (Ω m)	Density (g cm − ³ )	P -wave velocity (km s − ¹ )	Gamma ray (API)	Cementation exponent m
Shale-dominant (sh1)	0 to 18.6	13	5.6	361	2.72	3.7	126	1.31
Shale-dominant (sh2)	24.1 to 26.4	12	4.0	568	2.73	4.4	125	1.31
Shale-dominant (sh3)	29.1 to 38.1	15	4.7	452	2.73	4.3	124	1.31
Sandstone-dominant (sd1)	18.6 to 24.1	18	5.2	393	2.71	4.0	127	0.56
Sandstone-dominant (sd2)	26.4 to 29.1	18	5.7	396	2.72	4.1	121	0.56
Damage zone (hdz)	38.1 to 41.3	14	3.7	263	2.74	4.6	111	0.89

Depth, fracture density (number of fractures per 1 m), neutron porosity, resistivity, density, P-wave velocity, natural gamma ray values, and Archie’s cementation exponent m for the shale-dominant intervals, sandstone-dominant intervals, and the damage zone above the fault core in the hanging wall are presented.