We present ice thickness changes at Aparejo Glacier after its catastrophic slide in the Yeso River valley, central Chile (S 33 degrees 33,62'/W 70 degrees 00,11'), which took place on March 1st, 1980. The glacier has subsequently recovered partially by natural regeneration. Using available ALOS PALSAR and SRTM data, an estimation of thickness changes on the glacier has been computed, comparing the satellite information with a ground GNSS dataset. An average glacier thinning of -0.6 m/y was obtained when comparing the ALOS PALSAR-SRTM dataset for the period 2008-2000, while an average of -0,3 m/y resulted for the GNSS-ALOS comparison for the period 2015-2000. The ice thickness loss obtained for the entire glacier allows us to estimate as very unlikely the risk associated to a new catastrophic slide. The use of open-access interferometric satellite data is a robust means for understanding the present state of mountain glaciers.