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Article analysis:

The article “Anisotropy of the Pacific Upper Mantle” by Russell W. Raitt et al., published in 1969, presents research findings on seismic refraction measurements taken in the northeast Pacific Ocean between California and Hawaii which suggest that there is anisotropy present in the upper mantle with a maximum of 8.6 km/sec in a roughly easterly direction and a minimum of 8.9 km/sec. The authors then conducted special anisotropy experiments to test whether or not these observations represent true anisotropy, rather than geographical variation of velocity, and concluded that it was indeed due to true anisotropy in the upper mantle, rather than geographical variation of velocity.

The article appears to be reliable as it provides evidence for its claims through detailed descriptions of experiments conducted as well as results obtained from them. Furthermore, it is written by experts in their field who are well-versed with this topic and have provided sufficient information for readers to understand their findings clearly. However, one potential bias could be that since this article was published over 50 years ago, some newer research may have been overlooked or ignored which could provide different results or insights into this topic which would need to be considered when evaluating its trustworthiness and reliability today.