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GNSS-A time series data
The time series data of the seafloor positions measured using the GNSS-A technique is available at this page.
For details of the observation method, please see Yokota et al. (2018, Sci. Data).
When using the time series data
Notes on the data
| 地点名 | 地点名 | 地点名 | |||
| (1) | KAMN | (10) | TOK2 | (19) | MRT1 |
| (2) | KAMS | (11) | TOK3 | (20) | MRT2 |
| (3) | MYGI | (12) | ZENW | (21) | MRT3 |
| (4) | MYGW | (13) | KUM1 | (22) | TOS1 |
| (5) | FUKU | (14) | KUM2 | (23) | TOS2 |
| (6) | CHOS | (15) | KUM3 | (24) | ASZ1 |
| (7) | BOSN | (16) | KUM4 | (25) | ASZ2 |
| (8) | SAGA | (17) | SIOW | (26) | HYG1 |
| (9) | TOK1 | (18) | SIO2 | (27) | HYG2 |
| DATA | UPDATE |
| Latest data | Sep. 9, 2022 *ITRF2014 |
| (1)-(6) before Tohoku Earthquake | Mar. 31, 2017 *ITRF2005 (F3-solution-based) |
| coseismic movements at (1)-(6) | Mar. 31, 2017 *ITRF2005 (F3-solution-based) |
Format of the xyz data
The positions are written in ECEF coordinates (X, Y, Z).
| Line 1 | data version (updated date) |
| Line 2 | site name; reference coordinate system |
| Line 3 | description of each column |
| Line 4- | observation start date; absolute positions [XYZ coordinates (m)]; equipment code (A:-2002/07, B:-2008/04, C:2008/04-); vessel code (K:Kaiyo, M:Meiyo, S:Shoyo, T:Takuyo); observation end date |
Format of the ENU data
| Line 1 | data version (updated date) |
| Line 2 | site name; reference coordinate system |
| Line 3 | origin of the plane E-N-U coordinate system (latitude, longitude, ellipsoidal height) |
| Line 4 | position of reference epoch with (E, N, U = 0.0, 0.0, 0.0) from origin point described in Line 3 |
| Line 5- | observation start date; absolute positions [ENU coordinates (m)]; equipment code; vessel code; observation end date |
Format of coseismic movements due to the Tohoku Earthquake
Movements in xyz-data & enu-data are calculated based on the above formats.
| Lines 1-3 | headers |
| Line 4 | sites; observation date before Mar. 11, 2011; vessel code; observation date after Mar. 11, 2011; vessel code; movements [m] |
GNSS-A observation dataset used in our research paper
The datasets provided below are used in our research paper.
For the details of the data, please see Watanabe et al. (2020, Front. Earth Sci.).
When using the observation data
| data range | data file | citation | paper in which the data is used |
| Sites TOS2 and MYGI, from 2011 to 2019 | zip （129 MB） |
doi:10.5281/zenodo.3993912 | doi:10.3389/feart.2020.597532 |
| Sites along the Japan Trench, before the 2011 Tohoku Earthquake | zip （102 MB） |
doi:10.5281/zenodo.4528990 | doi:10.1186/s40623-021-01487-0 |
| Sites along the Japan Trench, after the 2011 Tohoku Earthquake to 2020 | zip （465 MB） |
doi:10.5281/zenodo.4529008 | doi:10.1186/s40623-021-01487-0 |
GNSS-A data analysis software "GARPOS"
The GNSS-A observation data listed above can be analyzed using the software GARPOS.
The released version is available at doi:10.5281/zenodo.4522027.
Please see Watanabe et al. (2020, Front. Earth Sci.) for the details of the methodology.