Pre-processed and modeled GNSS time-series after the 2011 Tohoku Earthquake

The raw, pre-processed, and modeled GNSS time-series of the 213 GEONET sites in the Tohoku region, Japan, from Mar. 12, 2011 to Nov. 20, 2021, relative to the Okhotsk plate (Argus et al., 2011, Geochemistry, Geophysics, Geosystems).

The original GNSS time-series are F5 solutions, which are distributed by Geospatial Information Authority of Japan (GSI, https://www.gsi.go.jp/). The details and availability of F5 solutions are written in Takamatsu et al. (2023, Earth, Planets, and Space) https://doi.org/10.1186/s40623-023-01787-7.

The GNSS time-series processing was performed by Tomita (submitted), and the following signals were excluded from the raw time-series: seasonal variation, coseismic step, antenna maintenance offset, and common mode errors. Then, the pre-processed time-series were modeled by a trajectory modeling method considering postseismic deformation of the 2011 Tohoku earthquake, the Boso SSEs, and postseismic deformations due to aftershocks and L-ASE (long-term aseismic slip event) since late 2019.

"sitelist.txt" - Site information file
column 1: Full site ID
column 2: 4digits site ID
column 3: Longitude [deg]
column 4: Latitude [deg]
column 5: Height [m] 

"pre-process/xxxx.txt" - Time-series at xxxx (4digits site ID) site
column 1: days from Mar. 12, 2011 (1 corresponds to Mar. 12, 2011)
column 2: raw East-West displacement [m]
column 3: raw North-South displacement [m]
column 4: raw Up-down displacement [m]
column 5: pre-processed East-West displacement [m]
column 6: pre-processed North-South displacement [m]
column 7: pre-processed Up-down displacement [m]

"model/xxxx/prediction_yy.txt" - Time-series for yy component (yy=EW, NS, UD) at xxxx (4digits site ID) site
column 1: days from Mar. 12, 2011 (1 corresponds to Mar. 12, 2011)
column 2: modeled displacement excluding the Boso SSEs [m]
column 3: modeled displacement excluding the Boso SSEs and postseismic deformation due to aftershocks caused one year after the 2011 Tohoku Eq. [m]
column 4: modeled displacement excluding the Boso SSEs, postseismic deformation due to aftershocks caused one year after the 2011 Tohoku Eq. and the 2019 L-ASE [m]

The displacement on Mar. 12, 2011 was initially set to be zero before the pre-processing, but the removal of the above factors provided some deviation from zero.

The raw time-series excluded outliers from the original F5 solutions, and the raw time-series were transformed into the Okhotsk plate reference.

Following the above trajectory modeling, the fully-relaxed postseismic displacement fields due to 2015 Feb. 17 Sanriku-oki earthquake ("Table_displacement1.xlsx"), the 2015 May 13 Miyagi-oki earthquake ("Table_displacement2.xlsx"), and summation of the 2021 Feb. 13 Fukushima-oki, the 2021 Mar. 20 Miyagi-oki, and the 2021 May 1 earthquakes ("Table_displacement2.xlsx") were calculated. Moreover, the cumulative displacement field due to the 2019 L-ASE since Nov. 25, 2019 was also calculated. In those files, the estimation errors are also shown as 1σ standard deviation obtained from diagonal components of the model covariance matrices. 

The details of these data are introduced in the corresponding paper (Tomita, submitted).