The proposed invention relates to a portable housingshelter unit assembled in a manufacturing building, loaded on a trailer truck and delivered to a site. 5 and 5%, and optionally annealing, wherein the quantity of refining agent is chosen such that the average casting grain size of the as-cast form is more than 500 \u03bcm. In one embodiment, identifying the cause of a call failure comprises determining signal characteristics, determining network resource availability, and determining cellular structure characteristics. As the result of which the supported object is efficiently isolated from the considerably higher frequent earthquake ground oscillations.