THE PROPAGATION OF THE DISTURBANCE, 129 
San Fernando. — The strong group at 15" 43™ is due to major arc waves corresponding 
to the strongest part of the motion. 
Kew. — Major arc waves arrive at 16°08". Upsala and Kobe show nothing. 
Paisley. — Major are waves would be expected at 16" 05". There are many beads in 
this part of the seismogram, but none especially strong. The very strong swelling, 16" 
13™ to 16" 22™, corresponds to minor arc waves arriving 4 minutes after the end of the 
strongest motion. 
Edinburgh. — Major are waves at 16" 08™ and 165 11”. 
Bidston. — Major are waves from 15° 40™ to 16 00"; but the earlier and equally 
strong beads would correspond to much smaller direct waves. 
Tokyo. — Professor Omori places the arrival of the major are waves at f, 155 31™. 
They would correspond to the direct waves arriving at 135 48.5™. 
Coimbra. — Major are waves arrive at 15°40™. The swelling at 155 21™ corresponds to 
the beginning of the long waves which are apparently not so strong. There is a slight 
increase in intensity at Gottingen at 15" 40™ and 15° 48™. The latter is also apparent 
at Coimbra. There is no evidence of major are waves at Jena. 
Irkutsk. — The major are waves would be expected at a point on the seismogram oppo- 
site the last hour mark, but nothing appears. 
Vienna. — Major arc waves are due at 15° 32.5™, but the seismogram at this point 
does not differ from the previous part of the record. 
Wellington. — The large swellings before x and after e’ are the major are waves corre- 
sponding to the two large swellings on each side of e, but the major are waves due to the 
large movement at 14" 25™ are not evident. 
Bombay. — Major arc waves should appear at the gap in the seismogram. The strong 
swelling at 15° 10™ corresponds to the beginning of the long waves, but it is so much 
stronger than the record of the direct waves that we can not correlate them. 
Batavia. — Nothing definite appears at 15° 14.5" and 15" 39™, when the major arc 
waves would be expected. 
Perth. — There are so many swellings that it is not possible to identify positively the 
major are waves. The large swelling at 15° 05.5™ corresponds to the beginning of the 
long waves at 14" 18.3™, but it is so much stronger than the direct waves that we can not 
consider it related to them. 
If we attempt to find the major arc waves corresponding to the direct waves which 
produce the largest earth-amplitudes, as they are given in table 19, page 138, we find the 
evidence of their existence entirely negative. The times of arrival of the direct waves and 
the major arc waves at several stations are contained in the following table: 
TaBLE 15,— Times of Arrival of Corresponding Minor and Major Arc Waves. 


Suani0x, Seg meiees 
8. . 8. 
RGIS hee on Deceyaatal oe 51 36. 
Gottingen . .. . 53.5 38 
Leipgigay i a. 2 : 
ANS) St \pet ae cee Gg we ade 55.5 37.5 
VaGniN Meme rey tl.” «4, 59 59.5 
Batavia’ eles: ae ; “a 


There are three stations situated practically on the same great circle passing thru the 
origin: Coimbra (81.4°), San Fernando (85.3°), and Wellington (262.4°), and they all 
have Milne pendulums. The major arc waves which arrive at Wellington at 155 36™ 
cause the latter part of the strong motion at Coimbra at 13" 57™. They should appear at 
K 
