. After earthquake and fire . Custom House was badly was poorly constructed. As in 1865, a small crevasse wasopened on Howard street, beyond Sixth. The greatest dam-age was done in a belt several hundred feet wide, runningnorthwest and southeast, commencing at the Custom Houseand ending at the Folsom street wharf. The tall chimney ofthe United States Mint was damaged. The ferry steamerContra Costa was near Angel Island and felt the shockstrongly. Shocks were noted at 7:53; 8:10; 8:15; 8:45; 9:20;9 ^30; 9135; 10; 10130; 11105 a. m., and 2 158 p. m. Waves came15 to 20 ft. further inla
. After earthquake and fire . Custom House was badly was poorly constructed. As in 1865, a small crevasse wasopened on Howard street, beyond Sixth. The greatest dam-age was done in a belt several hundred feet wide, runningnorthwest and southeast, commencing at the Custom Houseand ending at the Folsom street wharf. The tall chimney ofthe United States Mint was damaged. The ferry steamerContra Costa was near Angel Island and felt the shockstrongly. Shocks were noted at 7:53; 8:10; 8:15; 8:45; 9:20;9 ^30; 9135; 10; 10130; 11105 a. m., and 2 158 p. m. Waves came15 to 20 ft. further inland than usual. There were about thirtycasualties in the 150,000 inhabitants. Five deaths occurredfrom falling walls, etc. Not a single well-built house on thesolid land suffered materially, whether of brick, stone, orwood. Wooden houses suffered least. By following the trace of the pen on the record, it can beseen that the first large motion of the earth was due westiIt measures two inches. As the instrument multiplies CO. 44 AFTER EARTHQUAKE AND FIRE. times, the actual displacement of the earths crust or ampli-tude of the wave, was about one-half inch. This also cor-responds to the average amplitude of the resultants in thedirection SSE and NNW. Taking the average period as onesecond, the velocity of the earth-wave during the heavyshocks is found to be roughly two inches per second, by farthe greatest ever observed on the Coast. Heavy masses onfairly smooth surfaces were observed to move as much as threeinches. The times of the several shocks were carefully notedby Mr. Albrecht, Fellow in the Lick Observatory, now at theUniversity as a graduate student of astronomy, until 9 m. a. m. After that records were taken by Dr. Crawfordand Mr. Einarson with the Ewing seismograph. The lastshocks recorded are mainly from east to west. Observersthroughout California are requested to send their records tothe Students Observatory. The vertical component of theshocks was also of gr
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