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The 2016 Kumamoto earthquake sequence.

Aitaro Kato¹, Kouji Nakamura, Yohei Hiyama

¹Earthquake Research Institute, University of Tokyo.

Proceedings of the Japan Academy. Series B, Physical and Biological Sciences

|October 12, 2016

Summary

The 2016 Kumamoto earthquake sequence involved a major Mj 7.3 earthquake and foreshocks, releasing significant energy through right-lateral strike-slip faulting. This event caused widespread seismic activity and ongoing deformation in Kyushu, Japan.

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Area of Science:

Geophysics
Seismology
Tectonics

Background:

The Kumamoto area of Kyushu, SW Japan, experienced a series of significant earthquakes starting in April 2016.
A major Mj 7.3 earthquake on April 16, 2016, was preceded by an Mj 6.5 foreshock approximately 28 hours earlier.

Purpose of the Study:

To analyze the seismicity patterns and faulting mechanisms of the 2016 Kumamoto earthquake sequence.
To investigate the relationship between the mainshock rupture, regional deformation, and stress fields.

Main Methods:

Analysis of seismic data to determine earthquake locations, magnitudes, and faulting styles.
Comparison of seismic observations with geological deformation and stress field estimations.

Main Results:

The earthquake sequence was characterized by right-lateral strike-slip faulting along two active faults.
The mainshock rupture involved multiple fault segments with varying geometries.
Intense seismic activity, including dynamically triggered earthquakes, and significant postseismic deformation were observed.

Conclusions:

The faulting style is consistent with long-term regional deformation and estimated stress fields.
The Kumamoto earthquake sequence highlights complex rupture propagation and dynamic triggering phenomena.
Postseismic deformation and expanding seismicity indicate ongoing tectonic adjustments.