HR: 1340h
AN: S53B-0220    [Abstracts]
TI: Teleseismic P-wave Velocity Tomography Beneath The Arabian Peninsula
AU: * Park, Y
EM: ypark@geosc.psu.edu
AF: Department of Geosciences, Pennsylvania State University, University Park, PA 16802 United States
AU: Nyblade, A A
EM: andy@geosc.psu.edu
AF: Department of Geosciences, Pennsylvania State University, University Park, PA 16802 United States
AU: Rodgers, A
EM: rodgers7@llnl.gov
AF: Earth Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94551 United States
AU: Al-Amri, A
EM: amri444@yahoo.com
AF: Seismic Studies Center and Geology Department, King Saud University, Riyadh, 11451 Saudi Arabia
AB: We have imaged tomographically the three-dimensional velocity structure of the upper mantle beneath the Arabian Peninsula using teleseismic P-waves. The data came from the Saudi Arabian National Digital Seismic Network (SANDSN) operated by King Abdulaziz City for Science and Technology (KACST) and three permanent stations (RAYN, EIL and MRNI). The KACST network consists of 38 stations (27 broadband and 11 short-period) spread throughout most of western Saudi Arabia. P wave travel time residuals were obtained for 131 earthquakes in the distance range from 30\deg to 90\deg, resulting in 1716 rays paths. We find a pronounced low velocity anomaly beneath the southeastern Arabian Shield and southern Red Sea that likely represents a northward continuation of the Afar hotspot. We also image smaller low velocity anomalies beneath the Dead Sea Transform, the Gulf of Aqaba, and the northeastern corner of the Arabian Shield. The origin of these low velocity anomalies is uncertain.
DE: 9305 Africa
DE: 6982 Tomography and imaging
DE: 7203 Body wave propagation
DE: 1734 Seismology
SC: Seismology [S]
MN: 2004 AGU Fall Meeting