• journal_title：Bulletin of the Seismological Society of America
• Contributor：Tousson R. Toppozada ; Allan R. Sanford
• Publisher：Seismological Society of America
• Date：1976-
• Format：text/html
• Language：en
• journal_abbrev：Bulletin of the Seismological Society of America
• issn：0037-1106
• volume：66
• issue：3
• firstpage：877
• section：Articles

Interpretation of a seismic profile extending 548 km southward from the GASBUGGY nuclear test of December 10, 1967 resulted in a crustal model for central New Mexico. The crust is 39.9 km thick below the Paleozoic “basement”. It consists of an upper crust 18.6 km thick having P velocity 6.15 km/sec, and a lower crust 21.3 km thick having P velocity 6.5 km/sec. The apparent upper mantle velocity is 8.12 km/sec. This model applies near the crossover distance, 50 km west of Albuquerque. Additional information from earthquakes and explosions suggests that the upper crustal velocity drops to 5.8 km/sec in the Rio Grande rift, and that the true upper mantle velocity is 7.9 km/sec. The low upper crustal velocity in the Rio Grande rift can be detected on the record section of the GASBUGGY profile.