THE PROPAGATION OF THE DISTURBANCE, 
THE HODOGRAPHS 
All the available data which has been obtained bearing on the velocity of transmission 
has been collected in table 7 and exhibited graphically in plate 2. It will be seen that 
by far the larger number of observations occurred at distances between 70° and 100° from 
the origin. Many of the stations are at so nearly equal distances that they have been 
grouped together and entered as a single observation in the plate; therefore the number 
of observations marked on the plate is considerably less than the number actually repre- 
sented. All the seismograms have not the same degree of accuracy, and different sym- 
bols have been used to indicate these differences; the observations from some stations 
are less reliable on account of the difficulty in reading the seismogram; in some cases, 
less confidence can be given to the record because the seismogram was not at hand to 
confirm it; this applies with special force to the observations of the regular waves, for 
there is no general consensus of opinion as to the particular point of the seismogram that 
indicates their beginning. The curves drawn in the plate show the times taken for the 
three phases to travel from the origin to the distance of the observing station, these dis- 
tances being indicated in degrees and kilometers. The stations are marked at the bottom, 
singly or in groups; occasionally some stations of a group fail to yield satisfactory deter- 
minations of the time of arrival of a phase of the disturbance; this phase is then marked 
with the initials of the stations which recorded it. 



























TABLE 7. — Times of Transmission of the Various Phases. 
tt P. T. = First preliminary tremors. ] be P. T. = Second preliminary tremors.] 
R. W. = Regular waves.] . P.= Principal part.] 
Time INTERVAL, IN MINUTES AND SECONDS. 
STATION. Arc. CHORD. 
ila Ws Pal es he R. W. P. P, 
L km. km. m. Be m. 8. ms 8. m, 8. 
Mountelamilton 2). . 4 os 1.16 128 129 OF L7 0 26 
DVIGLOPIQMM ONCE’ 6 Umit Gen G 6 10.41 1157 1156 Zu 14 rae 
RILKi ee eer tee eS 20.72 2303 2291 4 34 8 38 | 10 04 
PU RCIDRW ee sane ey sr Bost? Se 27.70 3081 3050 eeoO el Om 245) toe O8Fmls 37 
PLOPOUUG) aw cas 1 Pane meee + es 32.93 3571 3610 6 48 | 12 00) 15 24 
Honolulu a Tew Es) bee oe 34.60 3846 3790 (ee OORT 5407 
CHAGWET Ae so ho yee! eee 35.38 3932 3871 Carolee 1222 Bes 18 30 
Wiaening tomes tae. ee 35.44 3939 3878 Gr oZe AZ 328 L622: 1°18 00 
@hoartenham < © bee kk bs 35.64 3962 3899 Gebon ele watt.) 48:1°20) 00 
PAUOLeMes te Teme over ah ee Pe 35.74 3973 3909 6 64) 127 42 Nate 19 06 
AVETADGU Myo se ee 35.55 3952 3889 6° 53 |} 12 33 |)17 20] 18 54 
IDA yes 8 a ee kl 37.13 4128 4056 OP OZ iG O40 205 17°) 21 12 
L2titatenikatcey ee a 6 co a 53.45 5942 5729 Oe 22a Liaaroe Rios 
Hu Shartetivol ace SR Gee ee 60.94. 6774 6460 areca scagante 29 30 
ADDIS Ome Sheers (RY 69.20 7694 é2008 L078 5419 256 eee 
NETZUSS WH, we el 70.46 7834 71349 | 11 39 | 20 46 Pere i Aare 
Ponta Delgaday j..0 ew ke 72.53 8064 7536 | 11 06 hes Pre 38 00 
PaISlCy Pee <1 as ee ce 72.54 8065 Woot LON 422-20 248: | 34. 54538. 30 
Darcerree 2.0 Pere We Ls 72.79 8092 7560 | 10 23} 19 47 eens 39 16 
itehialenbedal ba mee re aye uo kee 72.99 8115 Loon LL 00) 205730) 10.35 _30)) 39.30 
AAVEIAQC, Oa | .aRs gk eo yer All 8079 (ooe WLON 480) 20) (227) 354 12.) 38s 148 
Tokyo 5+ an Roe 0 ae ee 73.92 8217 TOOUME Ame OiealenoG lose, Sof No. 4é 
Bidston! ee se OSPR ee Oe 74.81 8317 Wdooume bln 145) 20s oo, 42 | 3599 06 
AVerage Min. Taek: see cme 74.37 8267 “cOORH LE oS |-2b 43-1 34° 47 | 38. 28 
Upsala se he ee a wee Ne 76.80 8538 DOTA EZ 2388) 22) 1637 @ 52 | 40 e134 
DHidGoes Wea es y ae Kn ts 77.08 8569 7938 | 11 48 | 21 44] 38 08 rere 
OSS Kane een of sche > fe. tee Mores 77.30 8594 Toot Lin oo | 2k 45 isp 28 
KOUGEVERCE PS cfs oe eaten & 17.54 8619 FOCGal Lieewoo | 2h) ok 7 37 —52 
IKOWAE I sg elie eR es 77.63 8630 7986 ee 21 30) 37 30 
Average 


