Two earth tremors caused topsoil and turf overturning, cracks in the ash mantle, and probably also cracks in soil profiles. In seismically active regions such episodic events may substantially influence soil profile development. © 1992.
Previtali, F. (1992). Seismipedoturbations in volcanic soils in north-eastern Ecuador. Catena, 19(5), 441–450. https://doi.org/10.1016/0341-8162(92)90043-B