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Modern Geomatics Technologies and Applications
Figure 2.The investigated FGM configurations, GRACE-reference (top-left), alternative GRACE Follow-
on (top-middle), Cartwheel (top-right), Pendulum (bottom-left), Helix (bottom-right) Elsaka et al. (2014).
In these scenarios, the distance between two satellites is always changing. However, the
changes vary depending on the type of satellites. For example, In GRACE, this changing is minimal and is
the main factor for calculating of gravity anomaly. But in Helix, this change takes place in three directions
and can reach far more than 100 km.
3.2.Maule earthquake
Therefore, the impact of the direction of the fault on detection of coseismic signals supposed that
another earthquake occurred in Maule position with exactly the same specifications but with hypothetical
strike angle of 90 degrees. The difference in degree obtained was as a result of satellite track almost along
the perpendicular fault direction. The characteristics of earthquakes used for simulation in this paper are
shown in Table 2 below.
7
