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May 24, 2026Zisin (Journal of the Seismological Society of Japan 2nd ser )

Relocation of Earthquake Hypocenters off Southeastern Okinawa Island, Japan, Using Interstation Corrections Based on CMT Solutions

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Authors

MKMasanao KomatsuOkayama Gakuin UniversityMKMei KITAMURAOkayama UniversityHTHiroshi TAKENAKAOkayama University

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Implication

Randomized trial analyzed earthquake locations in offshore Japan, suggesting improved accuracy with interstation corrections.

Key Points

  • The aim is to improve the accuracy of earthquake hypocenter locations off Okinawa Island using interstation corrections based on CMT solutions.
  • Relocated earthquakes from 2000 to 2024 using interstation correction time data based on CMT solutions from ten events.
  • Utilized the FAMT method with synthetic Green’s functions and a three-dimensional seismic velocity model for CMT calculations.
  • Analyzed the distribution of relocated hypocenters in relation to the subduction zone and aftershock activity.
  • Relocated hypocenters showed a distribution consistent with the subduction of the Philippine Sea Plate.
  • A notable cluster of relocated hypocenters included the mainshock and aftershocks of the 27 February 2010 MJMA 7.2 earthquake.
  • The analysis indicated spatial correlation with strong slip regions along the plate interface and identified recurring slow slip events in nearby areas.

Cite This Study

Komatsu et al. (2026) studied this question.

synapsesocial.com/papers/6a12950b48a0ea166567147chttps://doi.org/10.4294/zisin.2025-7
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