Which fault was primarily impacted by the earthquake with a magnitude of 7.3?

The San Andreas Fault is known for its significant seismic activity and has been the site of many large earthquakes, including those with magnitudes over 7.0. The 7.3 magnitude earthquake referenced in the question is consistent with the historical activity along the San Andreas Fault, which runs approximately 800 miles through California and is considered one of the most studied fault systems in the world.

This particular fault is notorious for its capacity to produce large quakes that can have widespread impacts across the state. Understanding the behavior of the San Andreas Fault is crucial for geologists, as it plays a central role in the tectonic framework of California. The other options represent other noteworthy fault systems, but they have not been specifically identified as the primary impact site for a 7.3 magnitude earthquake in the same way the San Andreas Fault has been. Thus, the identification of the San Andreas Fault aligns well with known seismic risks and patterns in California.