Michael C Carpenter

• Earth-fissure movements associated with fluctuations in ground-water levels near the Picacho Mountains, south-central Arizona, 1980-84
• Hydrogeology and deformation of sandbars in response to fluctuations in flow of the Colorado River in the Grand Canyon, Arizona
• Water-level declines, land subsidence, and specific compaction near Apache Junction, south-central Arizona
• Water-level fluctuations, water temperatures, and tilts in sandbars-6.5R, 43.1L, and 172.3L, Grand Canyon, Arizona, 1990-93