6/14/2023 0 Comments Vista seismicSome earthquakes, however, are not preceded by any appreciable premonitory gap (the second kind). Focal regions of the largest earthquakes in an active seismic belt are frequently seismic gaps of both the first and the second kind. This premonitory phenomenon is termed a seismic gap of the second kind. The other is a gap in seismicity of smaller-magnitude earthquakes before larger earthquakes. A seismic gap of the first kind could be identified not only for great shallow earthquakes along plate boundaries, but also probably for smaller intra-plate earthquakes. This is termed a seismic gap of the first kind. One is a gap in the spatial distribution of rupture zones of the largest earthquakes in a seismic belt. It is shown that there are two kinds of seismic gaps which are defined by two different features of seismic activity. The same term ‘seismic gaps’ has been used for different kinds of seismic gaps, resulting in some confusion.
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