 Complete the following phrase:  The tower gained notoriety when it withstood the magnitude 7.9 1957 earthquake, thanks to its outstanding design and strength. This feat garnered it recognition in the form of the American Institute of Steel Construction Award of Merit for the tallest building ever exposed to a huge seismic force as is attested by plaques in the buildings lobby and observation deck. However, an even greater test came, by far, with the magnitude 8.1 