> There was also a 5.3Ml quake on 10/30/1998 and was centered at 39.30N/119.98W. It’s rather doubtful that this quake is an aftershock of the 1857 quake.

Did you add that line just to see if anyone was reading your report? I read them all, and often the information you post causes me to look up more about the subject! Thanks for taking time to keep us informed.

Mary C.