7 Questions
What was the magnitude of the 1887 Sonoran earthquake?
7.4-7.5
Which area is mentioned as one of the most dangerous in terms of earthquake risk?
Northwestern Arizona (Western Grand Canyon)
What caused the formation of fault scarps after the 1887 Sonoran earthquake?
Valley drops due to faulting
Which province did the 1887 Sonoran earthquake occur in?
Basin and Range province
What is the likelihood of another 1887-scale earthquake occurring on the fault discussed in the video?
Very low
What is the role of Phil Pearthree in the Arizona Geological Survey?
Chief of Environmental Geology Section
What was the impact of the 1887 Sonoran earthquake on Sonora, Mexico?
Collapse of buildings with fatalities
Study Notes
- Research geologist Phil Pr3, chief of environmental geology section at Arizona Geological Survey
- Discussed the 1887 Sonoran earthquake, largest in Arizona history
- Ruptured about 60 miles of Earth's crust near Arizona-Mexico border
- Caused damage in Arizona, Mexico, including church collapses in Sonora with fatalities
- Estimated magnitude 7.4-7.5
- Occurred in Basin and Range province, where valleys formed by faulting
- Valley dropped up to 15 feet after earthquake, forming fault scarp
- Likelihood of another 1887-scale earthquake on that fault infinitesimally low
- Many other active faults in Arizona and surrounding areas pose potential earthquake risk
- Most dangerous areas: northwestern Arizona (Western Grand Canyon), Flagstaff
- Yuma also at risk due to proximity to San Andreas System
- Central and southwestern Arizona have lower seismic hazard, fewer identified faults.
Explore the details of the 1887 Sonoran earthquake, the largest in Arizona's history, and its impact on the region. Learn about the geological aspects of the earthquake, the formation of fault scarps, and the potential earthquake risks in Arizona and surrounding areas.
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