The purpose of this paper is to highlight the outstanding studies George Emory Goodfellow (1855–1910) and José Guadalupe Aguilera Serrano (1857–1941) made of the devastating 3 May 1887 Mw 7.5 Sonora earthquake (Figure 1). Goodfellow's observational study, based on his fieldwork in 1887 and partly published in Science in 1887 and 1888 (Goodfellow, 1887a, 1887b, 1888), includes the first surface rupture map of an earthquake in North America and photographs of the rupture scarp by Camillus Sidney Fly (1849–1901). Aguilera's 1888 publication (in Spanish), which is based on his expedition to the epicentral region...

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