There are a lot of ways of describing that chord and choosing the most appropriate name depends on the context. So much of the way harmony is taught emphasizes chords as structures in their own right, when that actually is not the most important factor in harmonic analysis. The two things that are most important are context and function, which go hand-in-hand. The chord you cite above has Bb-Eb-Ab with Eb in the bass. One might call it a "quartal chord", i.e., a chord built in fourths rather than thirds, but that might be a bit misleading and not really tell us anything about how the chord is used. The beginning of that same phrase alternates between I and IV chords, so with Eb again in the bass for this chord and having all but the G in common, it sounds a lot like IV, which of course has subdominant function. In fact, from all the IV chords at the start of the phrase, it sounds like the G has been replaced with the Ab. In that sense, the chord might best be described as an Eb chord with a 4th substituting for the 3rd. In other words, an Ebsus4 with subdominant function. That makes the most sense to me because of the chord's context. There are also other sus chords in this theme, like at the end of the first phrase, where we get Bb-F-Eb, or a Bbsus4 chord with tonic function. I talk more about this theme on my blog: http://www.filmmusicnotes.com/john-williams-themes-part-5-of-6-theme-from-jurassic-park/