One of the most interesting things to me about the Virginia earthquake is how wide-spread its waves were. Though I didn’t feel it here in Ithaca (NY), others in town did, and we’re hundreds of miles away from the epicenter. In contrast, during the four years we lived in Southern California, there were events relatively close that I never felt. Thinking about how the bedrock and faults affect wave diffusion was a new idea to me.
I like this visualization of the spread of the waves.