the town's 700 residents; Dr. George E. Goodfellow in Tombstone, Arizona Territory, loaded his wagon with medical supplies and rode to aid survivors. The townspeople named him El Doctor Santo (The Holy Doctor), and in recognition of his humanitarian contributions, Mexican President Porfirio Diaz presented him with a silver medal that had belonged to Emperor Maximilian and a horse named El Rosillo. Goodfellow noted that it was very difficult to pin down the time of the earthquake due to the absence of time pieces or a nearby railroad, and the primitive living standards of the area's residents. Goodfellow returned twice, the second time in July with Tombstone photographer Camillus Sidney Fly to study and record the effects of the earthquake. He covered over on horseback but mostly on foot through the Sierra Madre Oriental mountains recording his observations. His report included the first surface rupture map of an earthquake in North America and photographs of the rupture scarp by C.S. Fly. The United States Geological Service praised his "remarkable and creditable" report, describing it as "systematic, conscientious, and thorough." The earthquake was at the time the “longest recorded normal-fault surface rupture in historic time.” His report was later described as an “outstanding study” and a “pioneering achievement”. See also List of earthquakes in Mexico List of earthquakes in the United States List of historical earthquakes References Sonora Earthquake, 1887 Sonora Earthquake, 1887 Sonora Earthquake, 1887 Natural disasters in the Southwestern United States Earthquakes in Arizona Earthquakes in Mexico May 1887 events Sonora Earthquake, 1887 Sonora Earthquake, 1887