Context of the Yuha Desert Faults San Jacinto Fault Zone Elsinore Fault Zone Imperial Fault Laguna Salada Flt. San Andreas Fault Yuha Desert 1

Known active faults Potentially active faults Elsinore Fault Laguna Salada Fault 2 Previously Mapped Faults in the Yuha Desert

Known active faults Potentially active faults Previously Mapped Faults in the Yuha Desert Elsinore Fault Laguna Salada Fault 3

Known active faults Potentially active faults Previously Mapped Faults in the Yuha Desert Elsinore Fault Laguna Salada Fault 4

Known active faults Potentially active faults Previously Mapped Faults in the Yuha Desert Elsinore Fault Laguna Salada Fault 5

mapping verified fault rupture on known faults rupture mapped on newly discovered faults Yuha Fault New Fault Rupture From El Mayor Earthquake 6 Early Mapping – pre-InSAR Laguna Salada Fault

Interferogram 10/21/2009 – 4/13/2010 field-verified surface faulting (April through May) 7 8 km

8 Detail of UAVSAR image 10/21/2009 – 4/13/2010 (un-annotated)

9 Detail of UAVSAR image 10/21/2009 – 4/13/2010 early fault mapping (pre-InSAR)

10 Detail of UAVSAR image 10/21/2009 – 4/13/2010 early mapping plus additional faults (post-InSAR)

interpretations from InSAR field-verified surface faulting 11 Interpreted Faults from UAVSAR Interferogram 10/21/2009 – 4/13/ km

interpretations from InSAR field-verified surface faulting 12 Interferogram 4/13/2010 – 7/01/2010 Highlighting Continuing Deformation 8 km

Elsinore Fault Ocotillo Fault Zone northwest extension of the Laguna Salada Fault 13 Detail of UAVSAR image 4/13/2010 – 7/01/2010 fault rupture from June 2010 aftershocks 4 kilometers

Previously Mapped Faults in the Yuha Desert Elsinore Fault Laguna Salada Fault 14

Faults from All Sources Presenting Risk from Surface Rupture Elsinore Fault Laguna Salada Fault Zone Ocotillo F.Z. Yuha Fault interpreted faults field-verified surface faulting 15

Context of the Yuha Desert Faults San Jacinto Fault Zone Elsinore Fault Zone Imperial Fault Laguna Salada Flt. San Andreas Fault San Diego 16 Superstition Hills Flt.