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Studying stars that are located off the Galactic plane is important forunderstanding the formation history of the Milky Way. We searched for SiOmasers toward off-plane O-rich asymptotic giant branch (AGB) stars from thecatalog presented by Mauron et al. (2019) in order to shed light on the originof these objects. A total of 102 stars were observed in the SiO $J$=1-0, $v=1$and 2 transitions with the Effelsberg-100 m and Tianma-65 m telescopes. SiOmasers were discovered in eight stars, all first detections. The measured maservelocities allow the first estimates of the host AGB stars' radial velocities.We find that the radial velocities of three stars (namely G068.881-24.615,G070.384-24.886, and G084.453-21.863) significantly deviate from the valuesexpected from Galactic circular motion. The updated distances and 3D motionsindicate that G068.881$-$24.615 is likely located in the Galactic halo, whileG160.648-08.846 is probably located in the Galactic thin disk, and the othersix stars are probably part of the Galactic thick disk.

Maser Investigation toward Off-Plane Stars (MIOPS): detection of SiO masers in the Galactic thick disk and halo