[MIS02-P11] ICDP DSeis 8: the M5.5 fault structure and reflective intrusives in legacy 3D seismic reflection data
Keywords:ICDP DSeis, The M5.5 seismogenic zone, Seismic reflection
Aftershocks located by in-mine 46 geophones are dense at the southern upper fringe, with a sharp cut-off dipping about 20 degrees to the south; some clear stripes of aftershocks are also seen, in parallel to the upper fringe (Tadokoro et al., JpGU2019, ICDP DSeis 9). It is interesting to note that the reflector (sills) are also in parallel to the upper fringe of the aftershock zone and the aftershock stripes. It is also notable that stress concentration is reported at the intrusives by Sugimura et al. (JpGU2019; ICDP DSeis 5) and Kanematsu et al. (JpGU2019; ICDP DSeis 6). Some mechanism that controls the extent of the aftershocks should exist.
This paper is one of nine papers (ICDP DSeis 1-9). Refer other papers for other topics, e.g. on drilling, logging, stress measurements and evaluation, fault materials, and relocated aftershocks.
Acknowledgement: The DSeis team includes co-authors of the papers ICDP DSeis 2-9 and members shown at https://www.icdp-online.org/projects/world/africa/orkney-s-africa/details/. We thank Harmony Gold, Anglogold Ashanthi, Lesedi, Digital Surveying, OHMS, Seismogen, 3D Geoscience. ICDP, JSPS, SA NRF, MEXT Japan, US NSF, German DRF, and Ritsumeikan Univ. financially support the project.