HR: 0800h
AN: G21A-0119    [Abstracts]
TI: InSAR and the Hector Mine Earthquake
AU: * Calzia, J
EM: jcalzia@usgs.gov
AF: US Geological Survey, 345 Middlefield Rd, Menlo Park, CA 94025 United States
AU: Lu, Z
EM: lu@usgs.gov
AF: EROS Data Center, SAIC, Sioux Falls, SD 57198 United States
AU: Rykhus, R
EM: rykhus@usgs.gov
AF: EROS Data Center, SAIC, Sioux Falls, SD 57198 United States
AU: Sleeter, B
EM: sleeter@usgs.gov
AF: US Geological Survey, 345 Middlefield Rd, Menlo Park, CA 94025 United States
AB: A series of SAR interferograms of the southwestern Mojave Desert record the apparent development and collapse of a topographic anomaly near the epicenter of the Oct. 16, 1999 Mw7.1 Hector Mine Earthquake. Interferograms generated from Feb to Sept 1999 ERS-1 data show an elliptical uplift, centered about 20 km north-northeast of the epicenter. The uplift apparently developed between Aug 11 and Sept 15, 1999, as it is not observed in an interferogram generated from Feb 17, 1999 and Aug 11, 1999 data. The uplift covers approximately 2700 km2 and a regional amplitude of 2.8 cm; peak amplitude is nearly 7 cm. The uplift is partially obliterated on a Sept 15 and Oct 20, 1999 interferogram (the coseismic interferogram), and completely absent on three post-event interferograms. NOAA data record no rainfall in the area of the anomaly for October 1999, suggesting that the deformation may not be related to atmospheric anomalies. If this pattern of deformation can be documented for other seismic events, InSAR would be validated as a powerful new tool in earthquake prediction
DE: 1208 Crustal movements--intraplate (8110)
DE: 1242 Seismic deformations (7205)
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting