Document Type : Research Paper

Author

• Majid Mokhtarani

Master of Surveying Engineering (Remote Sensing)

Abstract

More than 25 years have passed from the date of development and implementation of the spatial method called “the base-lengths measurement using the Very Long Baseline Interferometry (VLBI)”. This method allows measurement of the motion of the Earth's Crust in an unusual way. The VLBI provides a unique ability to determine the format of inertial basis and to measure ground justification. Changes in ground justification in the inertial space are due to the following two issues:
A. The gravity force of the Moon and the Sun
B- The reaction of the sum of angular movements between the Earth's Crust, the oceans, and the atmosphere. The VLBI provides a direct measurement of ground justification in space, by which the Earth scientists examine cases including phenomena such as atmospheric angular torques, tidal currents of the oceans and reflections of solid (rigid) ground.