We report here on three 1997 deep earthquakes in Western Brazil, which extend the Northern end of the Peru–Brazil deep cluster and close the spatial gap with the deep shocks of 1921–1922, previously studied by Okal and Bina (1994) (hereafter Article I).

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Deep seismicity in South America has been described by many authors, most recently Kirby et al. (1995). It is characterized by significant lateral heterogeneity in the along-strike direction (generally north–south), with the activity arranged in clusters (see Figure 1). In particular, prior to the great 1994 Bolivian earthquake, no deep earthquakes were known...

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