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Figure 1: The small Rivera tectonic plate is shown relative to the larger surrounding plates. The Rivera subduction zone, which accommodates downward thrusting of the Rivera plate beneath the Jalisco region, was ruptured by a M = 8.2 earthquake in 1932 (Eisler and McNally, 1984). This may have been the same source of the October 9, 1995 Manzanillo earthquake.