Discussion
The stress regime at the mid-ocean ridges is tensional in character. This is supported by earthquakes due to :
Answer: B
The tension is shown by earthquakes due to Normal faulting.
Focal mechanisms of earthquakes under the crests of mid-ocean ridges show normal faulting, with the tension axis perpendicular to the ridge. Normal faults form when the crust is pulled apart, which confirms the tensional stress regime of sea-floor spreading.
Strike-slip earthquakes occur on the transform faults that offset ridge segments, not on the spreading crest itself. Reverse faulting indicates compression. 'Opening of rift' describes the process, not a type of faulting that earthquakes reveal.
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