The centennial of the 1906 San Francisco earthquake is a natural time to reflect on the past, present, and future of seismology. We've come far in little more than the hundred years since the first seismometers were developed in the late 1800's. We've learned a lot about Earth structure and are making progress in using that knowledge to understand the Earth's composition and dynamics. Similarly, we've learned much about the phenomenon of earthquakes and a reasonable amount about the tectonic processes that cause them, and are starting to learn about the physics of the earthquake process.

Still, it's useful to...

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