Fine-Scale Strain-Rate Mapping of Japan from Integrated PublicPrivate GNSS Stations

TAKAHASHI Hiroaki OHZONO Mako

Institute of Seismology and Volcanology

Sep. 25, 2026

図1. (a)超稠密GNSS観測網の観測点分布。丸がGEONET、四角がソフトバン ク独自基準点を示す。塗りつぶしたシンボルを地殻ひずみ速度場の推定に用い た。（b）超稠密GNSS観測網から推定された超高解像度地殻ひずみ速度分布。 面積ひずみ速度と主ひずみ速度を示す。（c）超高解像度地殻ひずみ速度場（最 大せん断ひずみ速度）と震央分布の比較。灰色の線が活断層、1923/01/14 2023/12/31の期間に発生した、水色の点が深さ20km以浅、青の丸が深さ20km 以浅マグニチュード5.5以上の地震の震央分布を示す。

Joint press release (in Japanese) by Tohoku University and Hokkaido University

Abstract
We integrated observational data from the Global Navigation Satellite System (GNSS) Earth Observation NETwork System (GEONET) in Japan, operated by the Geospatial Information Authority of Japan, with over 3,300 proprietary reference stations operated by SoftBank Corp., and, using observations from November 2019 to December 2023, estimated a nationwide interseismic strain-rate field (with postseismic contributions in some regions). We adopted an established framework that fits locally linear horizontal-velocity models with roughness-controlled spatial regularization. The degree of spatial locality (i.e., the roughness control parameter) was optimized using an L-curve. After quality control, 3,606 stations remained. In the analysis that jointly used GEONET and SoftBank data, the mean (grid-averaged) locality scale, expressed by the distance-decay constant D,….

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Article Information:
Miku Ohtate, Yusaku Ohta, Mako Ohzono & Hiroaki Takahashi, Fine-scale strain-rate mapping of Japan from integrated public–private GNSS stations, Earth, Planets and Space, 78, 210 (2026)
DOI：10.1186/s40623-026-02475-y