Propagation of the Charleston Earthquake. 5 



plainly be a phase at which the shocks had very great power, 

 sufficient to make themselves felt hundreds of miles away. 

 This phase should obviously be that which has been called the 

 beginning of the first maximum. It still remains to find the 

 corresponding time at the centrum. As the speed of propaga- 

 tion is now known to have been in the neighborhood of three 

 miles a second and as the distance of Charleston from the 

 theoretic centrum is 20 miles, the subtraction for the time at 

 the centrum is taken to be six seconds, making the time of be- 

 ginuing at that point 9:51:06 standard time of the 75th 

 meridian. 



The full catalogue was next examined in order to ascertain 

 what reports should be finally rejected. In the final report 

 this catalogue will be published, together with a list of the 

 rejected observations showing the grounds of rejection. For 

 present purposes a summary view of these reports is given, 

 showing the number of observations corresponding to specific 

 minutes or falling betweeen consecutive minutes. 



Table shoioing the numbers of reports corresponding to specified 

 minutes or falling betioeen consecutive minutes. 



9:4*7 and seconds J * 



9:48.... ....... 3 



9:50 32 



9:51 6 



9:5] and seconds 6 



9:52. 25 



9:52 and seconds 9 



9:53 28 



9:53 and seconds 16 



v:54 31 



9:54 and seconds 9 



9:55 86 



9:55 and seconds ... 8 



9:55 ' 21 



9:56 and seconds 2 



9:57 8 



9:58 _L_ • 5 



9:58 and seconds .. 1 



9:59 ' 3 



10:00 13 



10:0 1 2 



10:02 1 



Total 316- 



There are thus four reports giving times earlier than 9:50 and 

 three later than 10 o'clock. The synopsis illustrates well the 

 tendency of people to give time in terms which are multiples 



