Strong-motion’s baseline shift error is very difficult to process precisely; it is mainly caused by the tilting, rotation of the ground and
environment noises during the co-seismic period. In the study, we first studied how to effectively extract the strong-motion’s baseline shift
error with GPS observation; this also provides a new way of correcting the baseline shift errors. Then we studied how to retrieve the
ground tilting information of the station point with the collocated GPS and strong-motion observations, the information is an important
input parameter of rotational seismology. In addition, both experimental result and seismic data show that the baseline shift error is
mainly caused by the ground tiling and rotation during the co-seismic period. Also, there is a strong directly proportional relationship
between the baseline shift error and ground tilting, of which the proportionality constant is approximately equal to the value of gravitational acceleration of the station.
2016 COSPAR. Published by Elsevier Ltd. All rights reserved.