Abstract
Observations of surface deformation within 1–2 km of a surface rupture contain invaluable information about the coseismic behavior of the shallow crust. We investigate the oblique strike-slip 2016 M7 Kumamoto, Japan, earthquake, which ruptured the Futagawa-Hinagu Fault. We solve for variable fault slip in an inversion of differential lidar topography, satellite optical image correlation, and Interferometric Synthetic Aperture Radar (InSAR)-derived surface displacements. The near-fault differential lidar pose several challenges. The model fault geometry must follow the surface trace at the sub-kilometer scale. Integration of displacement datasets with different sensitivities to the 3D deformation field and varying spatial distribution permits additional complexity in the inferred slip but introduces ambiguity that requires careful selection of the regularization. We infer a Mw (Formula presented.) earthquake. The maximum slip of 6.9 m occurred at 4.5-km depth, suggesting an on-fault slip deficit in the upper several kilometers of the crust that likely reflects distributed and inelastic deformation within the shallow fault zone.
Original language | English (US) |
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Pages (from-to) | 6341-6351 |
Number of pages | 11 |
Journal | Geophysical Research Letters |
Volume | 46 |
Issue number | 12 |
DOIs | |
State | Published - Jun 28 2019 |
Keywords
- InSAR
- earthquake deformation
- earthquake source inversion
- lidar
- optical correlation
- shallow slip
ASJC Scopus subject areas
- Geophysics
- General Earth and Planetary Sciences