KaVA consists of 7 antenna sites in VERA-Mizusawa, VERA-Iriki, VERA-Ogasawara, VERA-Ishigakijima, KVN-Yonsei, KVN-Ulsan and KVN-Tamna with 21 baselines(see Figure 1). The maximum baseline length is 2270 km between Mizusawa and Ishigakijima, and the minimum baseline length is 305 km between Yonsei and Ulsan. The maximum angular resolution expected from the baseline length is about 1.2 mas for K bandand about 0.6 mas for Q band. The geographic locations and coordinate of each KaVA antenna in the coordinate system of epoch 2009.0 are summarized in table 1. figure 3 shows examples of uv plane coverage.
The average velocities of VERA stations in table 2 are predicted value at the epoch of 01/Oct/2011. Reference frame of these coordinates is ITRF2008. The rates of the coordinates of Mizusawa are the average value of change of the coordinates in September, 2011. The rates of the coordinates of Iriki, Ogasawara and Ishigakijima are obtained from averaging of change of the coordinates from December, 2004 to February, 2011. The 2011 off the Pacific coast of Tohoku Earthquake (Mj=9.0) brought the co-seismic large step and non-linear post-seismic movement to the coordinates of Mizusawa. Co-seismic steps of the coordinates of Mizusawa are dX=-2.0136 m, dY=-1.3795 m and dZ=-1.0721 m. The creeping continues still now, though decreased. The changes of coordinates by the post-seismic creeping are dX=-0.7269 m, dY=-0.5020 m and dZ=-0.2017 m in total from March 12, 2011 to October 1, 2013. Post seismic movements of Mizusawa are very complex. Internal error of coordinates of Mizusawa by polynomial fitting is 5-6mm. But, in a solution, a several centimeter differences arise for every fitting with the increase in geodetic observation data. It is judged that these differences are the uncertainly of the coordinates of Mizusawa.
|East Longitude||North Latitude||Ellipsoidal Height||X||Y||Z|
|Mizusawa||141 07 57.3||39 08 00.7||116.4||-3857244.4029||3108783.1553||4003899.2638|
|Iriki||130 26 23.6||31 44 52.4||573.6||-3521719.7674||4132174.6548||3336994.1511|
|Ogasawara||142 12 59.8||27 05 30.5||273.1||-4491068.6055||3481545.0506||2887399.6815|
|Ishigakijima||124 10 15.6||24 24 43.8||65.1||-3263994.0413||4808056.3278||2619948.8728|
|Yonsei||126 56 27.4||37 33 54.9||139||-3042280.9035||4045902.6564||3867374.3087|
|Ulsan||129 14 59.3||35 32 44.2||170||-3287268.5430||4023450.1448||3687379.9675|
|Tamna||126 27 34.4||33 17 20.9||452||-3171731.5532||4292678.5258||3481038.7679|
|Positions are obtained by KaVA K-band geodesy measured on 28 Jan 2014 (MJD: 56685)|
|site||ivs2||ivs8||cdp||x [m/yr]||y [m/yr]||z [m/yr]|
|IVS 2-characters code|
|IVS 8-characters code|
|CDP (NASA Crustal Dynamics Project) code|
|The epoch of the coordinates is January 01, 2013. Average speed was obtained|
|from the VLBI data from September 27, 2012 to August 11, 2013.|
In the case of KVN, all antenna locations are measured with GPS system. The antenna positions of KVN are regularly monitored both with GPS system and geodetic VLBI observations in collaboration with VERA. No velocity information is available for KVN stations.