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Figure S1. Top: Unwrapped coseismic interferograms (left: ENVISAT 091201--100105; centre: ENVISAT 091217--100121; and right: ALOS 090923--091224). Bottom: Deformation along profile B-B′ in the three interferograms, topography, and the location of the new fault trace and the Karonga fault.

Figure S2. Post-seismic ALOS interferogram (091224--100511) showing the locations of the profiles used for calculating the average subsidence with time (Fig. 4).

Figure S3. Checkerboard tests with patch size of (a) 2 × 2, (b) 1 × 1, and (c) 0.5 × 0.5 km2. (d) Checkerboard test with patches sequentially growing with depth by a factor of 1.6. Left: Initial slip model used to generate synthetic interferogram. Centre: The inverted slip model. Right: The difference between the initial and inverted models.

Figure S4. (a) Observations, (b) model and (c) residual of LOS surface deformation of ENVISAT interferogram that captures the last days of the coseismic deformation and 1 month post-seismic deformation (091217--100121) (d) Best-fitting fault slip model for this period.

Figure S5. Observed LOS deformation (left), modelled LOS dip-slip deformation (centre) and residuals (observed minus modelled; right), obtained by inversion of the ALOS data and assuming dip-slip only. (a) 4.5 months post-seismic interferogram (091224--100511). (b) 7.5 months post-seismic interferogram (091224--100811).

Figure S6. Best-fitting inverted dip-slip models. (a) First 4.5 months of post-seismic deformation (091224--100511). (b) 7.5 months of post-seismic deformation (091224--100811). These models assume dip-slip only.

Figure S7. (a) Poroelastic relaxation model and the related residual (data minus model). (b) A combination of afterslip and poroelastic relaxation models and the related residual. Data and afterslip model refer to the post-seismic interferogram of 091224--100811.

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