This is a set of positions of triggered shallow slips caused by 2016 Kumamoto earthquake using L-band SAR interferometry.
Discription
Various displacements due to horizontal and vertical ground
motion occurred in response to fault activity during the 2016
Kumamoto earthquake. By extensively and meticulously detecting
these surface displacements using radar observations from
satellites, it was found that there were not only widespread
surface displacements caused by seismic fault motion but also
numerous fine linear displacements. These displacements
resemble those caused by small-scale fault movements near the
surface, and the number of such surface faults reached
approximately 230. While some of these align in location and
displacement direction with known active faults, a notable
characteristic is that the number of newly detected surface
faults is significantly greater than that of the known active
faults. Surface faults with similar strike and displacement
directions are concentrated in each area, allowing them to be
classified into regional groups. Their strike and displacement
directions match those of known active faults or their
conjugate faults, indicating a close relationship with the
regional stress field in which they exist. The causes of the
detected surface faults can be classified as either the main
fault that caused the Kumamoto earthquake or its branch
faults, or as secondary faults triggered by the mainshock or
aftershocks.