The 1928 Chachapoyas earthquake occurred on May 14 at ."Historia de los Sismos mas Notables Occurridos en El Peru (1513–1974)" (PDF). p. 51. It had a magnitude of Mw 7.2, Ms 7.3,Hurtado, Jorge; Chang, Luis (2005). “Vulnerabilidad Sismica Estructural Y Efectos de Sitio" (PDF). XVII Simposio. CISMID. or ML 7.3. Chachapoyas, Peru was almost completely destroyed. A landslide in Pinpincos caused the death of 25 people.Hurtado, Jorge; Change, Luis (2005). "Mapa de Areas de Deslizamientos por Sismos en El Peru" (PDF). Universidad Nacional de Ingeniería, Lima – Perú. "II. Estudio de Caso de los Desastres del Alto Mayo, Peru, de 1990 y 1991" (PDF). p. 7–19. Many houses were damaged in Machala, Ecuador. The maximum intensity was X (Extreme) on the Mercalli intensity scale."Banco de Datos de Mapas de Isosistas en El Peru" (PDF). FIC-University National de Ingenieria. The earthquake could be felt in Lima. It could also be felt in Ecuador, Brazil, and Colombia.
Aftershock A strong aftershock occurred on July 18, 1928, at 14:05 local time (19:05 UTC)."Historia de los Sismos mas Notables Occurridos en El Peru (1513–1974)" (PDF). Some houses which had already been damaged in the main shock collapsed.
See also List of earthquakes in 1928 List of earthquakes in Peru
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