April 27th, 15 h. 56 m.—A shock at San Francisco.
May 24th, 3 h. 21 m.—A smart shock at San Francisco, consisting of a single wave. At San Juan (south) the earthquake consisted of two sharp shocks, and at Santa Cruz of one only. At the latter localities it was three and four minutes later than at this city.
September 22d (no hour).—A smart shock occurred at Yreka.
October 1st, 9 h. 15 m.—A very smart shock was felt at Fort Humboldt, and throughout the district of Humboldt Bay.
October 8th, 12 h. 46 m.—A severe shock at San Francisco. This earthquake was the most violent of any occurring on this peninsula since the American occupancy, but was not sufficiently heavy to do serious damage; all the injuries sustained to property were of a trivial nature, the principal being the demolition of parts of the parapet walls erected above the roofs, to shield the latter in cases of fire in adjoining buildings; the fracture of walls in every instance occurred in insecure buildings, and heavy buildings erected on the made lands of the city front.
At San José, Santa Clara, and Santa Cruz, the earthquake appears to have been equally severe as in this city. At Petaluma, on the north, it was also quite severe. At Sacramento the shock was not marked by the same severity as at the other localities mentioned. At Stockton the shock was heavy, but no damage done, nor was there any damage at Sacramento. The shock was severe at Grass Valley.
The direction of the wave in this earthquake was north fifty degrees west; the limited area over which it extended has not furnished sufficient data to calculate its velocity.
This earthquake differs from all others that have occurred in this locality in this particular: the earth continued to vibrate with increasing and again decreasing degrees of force for ten hours, at no time entirely ceasing during this period.
22 h. 1 m., another light shock, consisting of a single vibration.