What tectonic setting produces earthquakes such as the San Francisco earthquake, but is unlikely to produce mountains except where bent?

Question

BlackTom AI · Accepted Answer

Strike-slip (slide-past) plate boundaries produce the type of earthquakes exemplified by the 1906 San Francisco event on the San Andreas Fault.

1. Relevant knowledge points and concepts
- Plate boundaries: convergent (push-together), divergent (pull-apart), transform (slide-past), and intraplate hotspots.  
- Strike-slip/transform boundaries accommodate lateral, horizontal motion between plates and commonly produce strong shallow earthquakes.  
- Mountain building requires sustained compression and crustal shortening; transform motion produces little net shortening except at geometric irregularities (bends) that convert lateral motion into local compression (transpression) and uplift.

2. Step-by-step reasoning
- The San Francisco (1906) earthquake occurred on the San Andreas Fault, a classic transform/strike-slip fault where the Pacific Plate moves northwest relative to the North American Plate.  
- Transform faults primarily generate shear stress and lateral displacement, leading to earthquakes along the fault plane. Because the plates slide past each other, there is no long-term large-scale crustal thickening to build mountain ranges.  
- Where a transform fault has a bend or step-over, that local geometry produces compression or extension. Compression at a bend causes uplift and localized mountains (e.g., the Transverse Ranges near the Big Bend of the San Andreas). Without such bends, transform boundaries do not form mountain belts.

3. Calculations
- Not applicable (no numerical calculation required).

4. Why the correct answer is correct
- “Slide-past” (transform/strike-slip) matches the earthquake mechanism and the statement that mountains are unlikely except where the fault is bent, consistent with known behavior of the San Andreas system.

5. Why other options are incorrect
- Push-together subduction: produces major mountain chains and volcanic arcs (e.g., Andes), not primarily slide-past earthquakes.  
- Push-together obduction (continental collision/obduction): builds large mountain belts (e.g., Himalaya) via compression.  
- Pull-apart (divergent): produces rift valleys and seafloor spreading, not the lateral strike-slip earthquakes like San Francisco.  
- Hot-spot: produces volcanic islands and intraplate volcanism (e.g., Hawaii), not transform-style lateral earthquakes.

6. Conclusion
The correct choice is Slide-past, which matches the provided answer.

What tectonic setting produces earthquakes such as the San Francisco earthquake, but is unlikely to produce mountains except where bent? 单项选择题

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