AI Article Synopsis
- Large interplate earthquakes can result in postseismic slip that occurs in regions surrounding the initial rupture due to differences in friction and material properties of the faults.
- The 2011 Tohoku Earthquake presents challenges in estimating high-resolution slip because of limited seafloor geodetic data.
- By utilizing seafloor and terrestrial data in a finite-element model, researchers verified that the co- and postseismic slip distributions were spatially separated, supporting the validity of the conventional frictional property model for massive earthquake source regions.
Article Abstract
Large interplate earthquakes are often followed by postseismic slip that is considered to occur in areas surrounding the coseismic ruptures. Such spatial separation is expected from the difference in frictional and material properties in and around the faults. However, even though the 2011 Tohoku Earthquake ruptured a vast area on the plate interface, the estimation of high-resolution slip is usually difficult because of the lack of seafloor geodetic data. Here using the seafloor and terrestrial geodetic data, we investigated the postseismic slip to examine whether it was spatially separated with the coseismic slip by applying a comprehensive finite-element method model to subtract the viscoelastic components from the observed postseismic displacements. The high-resolution co- and postseismic slip distributions clarified the spatial separation, which also agreed with the activities of interplate and repeating earthquakes. These findings suggest that the conventional frictional property model is valid for the source region of gigantic earthquakes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5118554 | PMC |
| http://dx.doi.org/10.1038/ncomms13506 | DOI Listing |
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