Result of Analysis of Integrated GNSS Observing Stations of SoftBank, Universities and GSI (1)

Fig.1. Result of Analysis of Integrated GNSS Observing Stations of SoftBank, Universities and GSI. Red circles are hypocenters of JMA unified catalogue (M >= 2, depth <= 20 km).
(a) IDs of GNSS observing stations used for analysis. IDs beginning with BR are stations of SoftBank. SZOT and SZMS are stations of DPRI, Kyoto Univ. SZHK and NTYD are stations of Kanazawa Univ. P111 and 4-digit IDs are GEONET stations.
(b) Variation vector diagrams for 1 year from February 23, 2021. Squares in red/blue denote vertical up/down variations. Based on the daily coordinate values compliant with ITRF2014 using the precise ephemeris, displacements for each period are shown after removing the extrapolated linear trend, exponential, logarithmic, annual, and semi-annual components estimated for the GSI stations for the period from 2017 to 2019 (before the earthquake swarm period). For observing stations of SoftBank and universities, only the linear trend component interpolated from estimates for surrounding GEONET stations by the method of Okazaki et al. (2022) was removed. In addition to these, the common error component is also removed by the spatial filter.
(c) Variation vector diagrams for the period from November 16-25, 2020 to June 6-15, 2022. Squares in red/blue denote up/down variations.

Kyoto University, Kanazawa University, and Tohoku University
[Evaluation of Seismic Activity in the Noto Region, Ishikawa Prefecture (July 11, 2022)]