There's a few articles that go into a loosely defined faulting area dubbed the Walker Lane[1][2][3] in which it's theorized that the East Pacific Rise (a rift), under the Gulf of California, may be expanding directly north. I know some geologists were surprised at first at the 7.4 Landers earthquake in 1994, and the article goes into that the Walker Lane seems to follow US 395, so I wonder if this is just a continuing extension of geologic activity associated with it.

[1] https://volcanohotspot.wordpress.com/2018/09/21/splitting-no...

[2] https://www.wired.com/story/walker-lane-move-over-san-andrea...

[3] http://www.bldgblog.com/2019/04/walker-lane/