Interferogram model for a simple expanding spherical magma chamber from an ascending and descending orbital perspective

Panels A and B show what an interferogram would look like for a simple expanding spherical magma chamber from an ascending and descending orbital perspective. The star shows the true center of the inflating magma source. The arrow and bar denote satellite flight direction and look direction respectively. Each fringe represents approximately 1.55 cm. Panels C and D show the same event in a cross-section view. The black lines and arrows show the displacement as viewed by the SAR satellite in its line-of-sight (LOS), while the grey lines and arrows show the ground displacement physically occurring. The key in panel C gives the scale of the arrows. Notice in the ascending case, the deformation pattern is shifted and skewed west while the descending case shows the opposite.