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The denominated lavina of the Central Valley, constituted by lava blocks floating in a volcanic mud matrix, had been interpreted genetically as a lahar or debris flow deposit. This work tries to discuss some characteristics that suggest that the deposit originated in a debris avalanche event, that transformed into a debris flow. Avalanche amphitheaters were identified in extinct stratovolcanoes in the western sector of the Irazú vol- cano, where the most probable source of origin is the sector of collapse in the west flank of the Cabeza de Vaca volcano. This event could have occurred around 150 ka -250 ka, possibly during or at the end of glacial periods in the northern hemisphere. Wells in most of the Metropolitan area allowed the morphometric definition of the stratigraphic surfaces, and determined a volume = 2.0 km 3 in an approximated area of 130 km2.

La <i>Lavina</i> del Valle Central (Costa Rica): ¿lahar o <i>Debris Avalanche</i>?