Maybe The Earthquake had a far reaching influence all over the USA.
Maybe it's a coincidence.
I do know I have seen the streets' pressed into the cement in many cities--so many that it is normal to me.
(Here, where I live, in an unincorporated area just north of the City of Vancouver (USA) Washington, sidewalks have been added recently, and I have noticed the street names are absent. (I'll have to contact Clark County Roads Department about this!) In the downtown area of Vancouver, the names are there in the cement, as well as some metal rings. The City and/or County certainly received more than the minimum necessary from the lowest bidder back then. Those rings were to secure horses, and have lasted for, in some cases, over 100 years!)
Fairly recently, we commented on misspellings in the cement: "fourty" instead of "forty" for example, out in The Avenues, as well as transposed letters, reversed letters, and other fatigued City and County workers' errors.
It *is* interesting to consider if The Earthquake influenced the stamped into cement street names.