The Maule River estuary outfalls at Constitución, one of the hardest hit communities following the tsunami in 2010. Extreme pulses of inundation are common to these environments where marine sand meets river silt. At present, many estuaries along the Chilean coast are infilled by coastal concretization that intervenes between marine and terrestrial realms. The wave action following an earthquake brought silty inundation, erosion, and deposition to the estuarine coast, a disturbance that is neither unprecedented nor particularly unique. The lineage of estuary formation across time is described by early mapping efforts that creatively articulate the watery southwest coast of Chile.

A rupture twenty-five kilometers deep beneath the Nazca plate, produced the earthquake, triggering a tsunami that traveled along the fault at tectonic junctions. The magnitudinous waves spread beneath the coast until making landfall along the shores between Constitución and Concepción. Magnitude is relative power, and its measurement takes into account the energy released at the source. By comparison, intensity is the strength of the shaking produced by the magnitude.