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- W2479220836 abstract "The characteristics of a strong mid-crustal reflector in the Rio Grande rift southwest of Socorro, New Mexico, were studied using high-quality digital seismograms of microearthquakes. The data are from a tight cluster of hypocenters located almost directly beneath the recording station (Δ ∼ 2 km). Cross-correlation of the direct and reflected microearthquake S phases yields coefficients which are positive and large in absolute value (average = 0.79). Because these two phases leave the focal region 180° out of phase for this swarm, reflection must occur at a discontinuity where a 180° phase shift occurs. Waveforms for the P -wave reflections are not identical from event to event within the swarm. The character of the P reflection indicates a magma body with rapid lateral changes in internal structure. The spectral characteristics of the reflected P phase are suggestive of constructive interference. The near-normal incidence geometry of both the reflected and direct P phase implies an essentially common path through the upper crust and near surface Phanerozoic rocks for these two phases. The earthquakes examined in this study are quite small ( ML < 0); hence, the initial portion of the direct P phase may be used as the response function for the path through the upper crust during modeling of the reflected P phase. Synthetic seismograms, which include attenuation effects and interbed multiples, were calculated and compared to the observed waveforms. The results of modeling the stacked spectra of the PzP phase indicate a thin (∼70 m) layer of nonrigid, low-velocity material underlain by a second, thin (∼60 m) layer of slightly higher velocity material. This second layer may be an earlier, partially solidified intrusion or a crystalline mush at the base of a single magma chamber. The total thickness of the magma body is estimated to be < 150 m." @default.
- W2479220836 created "2016-08-23" @default.
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- W2479220836 date "1988-06-01" @default.
- W2479220836 modified "2023-09-23" @default.
- W2479220836 title "New evidence for the existence and internal structure of a thin layer of magma at mid-crustal depths near Socorro, New Mexico" @default.
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- W2479220836 doi "https://doi.org/10.1785/bssa0780031335" @default.
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