EAKTHQUAKES ON THE PACIFIC COAST 141 



quite slight, lasting- only about three seconds. The correction of 

 my watch was determined by transit observations by Mr. Blinn, 

 shortly after the shocks occurred. — Wm. Ireland. 



Berkeley: at the University observatory a diagram was obtained 

 showing the effect of both shocks. The greatest oscillations are 

 in an east and west direction. (About 13 millimeters, magnified, 

 but the pen did not return to the starting point, stopping about 

 midwajr on the diagram. The greatest motion is perhaps 6 milli- 

 meters.) Time 4.47 a. m. " It seemed to me the sharpest shock 

 since 186S. It was followed by three slight tremors, and another 

 at 6.20 p. m." — Prof. Soule. 



San Francisco: time 4.46.38. — Prof. Davidson. 4h. 46m. a. m. Shock 

 in 3 distinct waves; the first lasting 58., N. E. and S. W. for the 

 middle wave, followed by light waves. Total duration 30 seconds. 

 — T. T. 



Carson City, Nevada. — The earthquake of July 31 was not felt here. 

 The seismograph did not show a trace. — C. W. Friend. 



Reports sent to the San Francisco papers follow, all dated July 31: 



San Jose: there was a heavy shock at 4.45 this morning, the heaviest 

 in seven years. No damage w^as done, and there was no excite- 

 ment. The oscillations appeared to be north and south. 



Oakland: the earthquake was quite severely felt in Oakland. The 

 shock was very sharp, but little damage was done. 



At the students' observatory at Berkeley the shock was registered 

 as occurring at 4.47 o'clock in the morning and lasting fifteen 

 seconds. The vibration was from north of west to south of east. 

 It was followed by three slight ones at short intervals. Prof. 

 Soule says that this was the most severe earthquake that he has 

 experienced since he came to California, in 1869. 



Sacramento: there was no earthquake here. 



Napa: an earthquake at 4.45 this morning, preceded by tremors 

 which continued about six seconds. The shock which followed 

 viras qiiite heavy, lasting four seconds. The vibrations were north 

 and south. No damage. 



Petaluma: two heavj^ shocks at 4.45 o'clock a. m. The vibrations 

 w^ere from east to west. 



Martinez: there was a severe shock at 4.50 o'clock this morning, 

 lasting several seconds. No damage. 



Gilroy: there was a slight shock at 5 o'clock this morning. 



Santa Cruz: an earthquake was felt here at 4.50 o'clock this morn- 

 ing, lasting several seconds. The vibrations were west to east. 



Centerville: two heavy shocks at 4.47 o'clock of about twenty-five 

 seconds' duration. The vibrations were east and west. No dam- 

 age has been reported as yet. 



