Dissipative Intraplate Faulting During the 2016 Mw6.2 Tottori, Japan Earthquake

Zachary E. Ross; Hiroo Kanamori; Egill Hauksson; Naofumi Aso

doi:10.1002/2017jb015077

journal article Feb 01, 2018

Dissipative Intraplate Faulting During the 2016 Mw6.2 Tottori, Japan Earthquake

Zachary E. Ross

Hiroo Kanamori

Egill Hauksson

Naofumi Aso

Journal of Geophysical Research: Solid Earth Vol. 123 No. 2 pp. 1631-1642 · American Geophysical Union (AGU)

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Abstract

AbstractThe 2016 Mw6.2 Tottori earthquake occurred on 21 October 2016 and produced thousands of aftershocks. Here we analyze high‐resolution‐relocated seismicity together with source properties of the mainshock to better understand the rupture process and energy budget. We use a matched‐filter algorithm to detect and precisely locate >10,000 previously unidentified aftershocks, which delineate a network of sharp subparallel lineations exhibiting significant branching and segmentation. Seismicity below 8 km depth forms highly localized fault structures subparallel to the mainshock strike. Shallow seismicity near the main rupture plane forms more diffuse clusters and lineations that often are at a high angle (in map view) to the mainshock strike. An empirical Green's function technique is used to derive apparent source time functions for the mainshock, which show a large amplitude pulse 2–4 s long. We invert the apparent source time functions for a slip distribution and observe a ~16 km2patch with average slip ~3.2 m. 93% of the seismic moment is below 8 km depth, which is approximately the depth below which the seismicity becomes very localized. These observations suggest that the mainshock rupture area was entirely within the lower half of the seismogenic zone. The radiated seismic energy is estimated to be 5.7 × 1013J, while the static stress drop is estimated to be 18–27 MPa. These values yield a radiation efficiency of 5–7%, which indicates that the Tottori mainshock was extremely dissipative. We conclude that this inefficiency in energy radiation is likely a product of the immature intraplate environment and the underlying geometric complexity.

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Details

Published: Feb 01, 2018
Vol/Issue: 123(2)
Pages: 1631-1642
License: View

Authors

Z

Zachary E. Ross

Seismological Laboratory California Institute of Technology Pasadena CA USA

H

Hiroo Kanamori

Seismological Laboratory California Institute of Technology Pasadena CA USA

E

Egill Hauksson

Seismological Laboratory California Institute of Technology Pasadena CA USA

N

Naofumi Aso

Department of Earth and Planetary Science University of Tokyo Tokyo Japan

Funding

National Science Foundation Award: EAR‐1550704

Gordon and Betty Moore Foundation

Cite This Article

Zachary E. Ross, Hiroo Kanamori, Egill Hauksson, et al. (2018). Dissipative Intraplate Faulting During the 2016 Mw6.2 Tottori, Japan Earthquake. Journal of Geophysical Research: Solid Earth, 123(2), 1631-1642. https://doi.org/10.1002/2017jb015077

Dissipative Intraplate Faulting During the 2016 Mw6.2 Tottori, Japan Earthquake

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