1

National Aeronautics and National Aeronautics and Space AdministrationSpace Administration Satellite Radar Images Quake

Interferograms from Japanese radar satellite show up to 3 meters (10 feet) of fault slip along full length of fault system (dashed white line)

Gray areas show wide-spread surface disruption in Colorado River Delta due to liquefaction, flooding and other effects

Epicenter

2

National Aeronautics and National Aeronautics and Space AdministrationSpace AdministrationNASA Gulfstream Flies UAVSAR

3

National Aeronautics and National Aeronautics and Space AdministrationSpace Administration UAVSAR Images Motion

5 cm(2 inch)contours

of ground motion

Ground moved as much as

80 cm (30 inches)southand

down

• First earthquake deformation captured by the UAVSAR system using data acquired on October 21, 2009 and April 13, 2010.

4

National Aeronautics and National Aeronautics and Space AdministrationSpace Administration Fault Slip Continued After April

•Numerous small fault offsets of 0.5–4.5 cm on faults trending northwest and northeast in Yuha desert

•Yuha Fault slipped at time of main earthquake and afterwards, but motion mostly stopped after July.

image resolution ~7 m, 5 cm contours

Newly mapped Yuha Fault

5

National Aeronautics and National Aeronautics and Space AdministrationSpace AdministrationDeep Fault Slipped June-August

• UAVSAR and satellite radar shows deep fault slip from June to August 2010 in western Yuha desert

• Northwest extension of Laguna Salada Fault Zone was cause of June 14 M5.7 and its aftershocks

• Motion stopped by September

6

National Aeronautics and National Aeronautics and Space AdministrationSpace Administration Radar Monitors Surface Motion

• Radar image differencing (interferometry) measures ground motion to few mm or small fraction of inch

• Large motions near main earthquake reveal complex fault system

• Smaller motions in Yuha Desert show triggered slip on faults that transfer strain from Mexico to Elsinore and San Jacinto Faults

• Late fault slip in June and July ended by September 2010