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Abstract: We have studied the propagation efficiencies of the Sn and Lg phases throughout China and produced summary maps.
In addition, estimates of coda Q, Q for the Pn phase, and Q for the Lg phase for Tibet have been made.
Sn has difficulty propagating across extended terrains in eastern China, the northern Tibetan plateau, and Mongolia. This makes it a difficult phase to use for nuclear monitoring purposes. Analysis of the Pn and Lg Q for northern Tibet show that partial melt both in the uppermost mantle and middle crust quickly attenuate these phases. Lg does propagate well over most of the rest of China, especially when it does not traverse major changes in crustal structure
Originally posted by frozen_snowman
This document is linked with the Vela incident:
Vela Network Evaluation and Automatic Processing Research - seismology
In the meantime a race of human-looking aliens contacted the U.S. Government. This alien group warned us against the aliens that were orbiting the Equator and offered to help us with our spiritual development. They demanded that we dismantle and destroy our nuclear weapons as the major condition. They refused to exchange technology citing that we were spiritually unable to handle the technology which we then possessed. They believed that we would use any new technology to destroy each other. This race stated that we were on a path of self-destruction and we must stop killing each other, stop polluting the earth, stop raping the Earth's natural resources, and learn to live in harmony. These terms were met with extreme suspicion especially the major condition of nuclear disarmament. It was believed that meeting that condition would leave us helpless in the face of an obvious alien threat. We also had nothing in history to help with the decision. Nuclear disarmament was not considered to be within the best interest of the United States. The overtures were rejected.