Summary of interpetations of six years of tiltmeter motions above the flanks of the Socorro Magma Body, central Rio Grande Rift
D. W. Love, B. D. Allen, R. M. Chamberlin, and W. C. Haneberg
Tiltmeters installed on the flanks of the uplift above the Socorro magma body (February 2002 through February 2008) show 1) twice-daily earth-tide cycles of 10ths of μrad; 2) effects of seasonal changes in temperature at 3-4 m depths; 3) 10-14-month variations perhaps related to seasonal lags in temperatures at depth; 4) effects of surface waves from distant earthquakes; 5) effects of large amounts of rainfall; 6) a few abrupt excursions of uncertain origin; and 7) multi-year, long-term changes in average tilts, both in direction and magnitude. Several of these effects create an intractable problem of resolving tilts at less than 12-month averages. We have yet to determine whether the overall trends in tilt are real or whether they might be due to instrument drift. Data so far do not show consistent tilts away from surface uplift above the magma body.
- Love, D. W.; Allen, B. D.; Chamberlin, R. M.; Haneberg, W. C., 2009, Summary of interpetations of six years of tiltmeter motions above the flanks of the Socorro Magma Body, central Rio Grande Rift, in: Geology of the Chupadera Mesa, Lueth, Virgil W.; Lucas, Spencer G.; Chamberlin, Richard M., New Mexico Geological Society, Guidebook, 60th Field Conference, pp. 145-152.