R. R. Hopkins, San Bernardino, January 1857 journal:
"Friday [Jan] 9 At 25 minutes past 8 o'clock this morning our city was visited with a violent Earthquake which crack the walls of most of the Houses in the place the water in the stream was violently agitated and thrown several feet high. The trees swayed to and fro as if in a strong gale, though the air was calm. There was two shocks the first lasted two minutes and in about ten minutes there was a second shock not so violent which lasted about one minute."