82 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
(2) North component: 7’), 14.07 seconds; V, 152; J, 7,500 meters; ¢, 3.9; r, 1.5 mm.; 
M, 1,200 kg.; L’, 49 meters. 
(3) East component: 7’, 12.6 seconds; V, 172; J, 6,700 meters; ¢, 3.4; r, 0.9 mm. ; 
M. 1,200 kg; L’, 39.7 meters. “ 
(4) Wiechert Vertical Motion Seismograph. 7’), 4.8 seconds; V, 170; J, 970 meters; 
e, 2.8; 7, 0.1 mm.; M, 1,300 kg; L’, 5.7 meters. 











First SECOND R P aH = 
Peggaeniasy PReTTeAST| Waves. |i) Pant-l ote Me |hoeuoe ileus 
: m. 8. Mm. (8. PME m 8. BO ics WE mm, sec. 
(1) North component .| 24 55 35 15 51 10 |57 55 to 07.0) 59 20 18 20 
(2) North component .| 24 44 34 52 Ol eee OOn. O01t0,06:0| ar amr 48+ | iF 
(3) East component. .| 24 46 34 46 OL Miana | |\OomeoaabOsLO.0| emer 40+ a 
(4) Vertical component.| 24 31 35 31 SLSSLO. ices 05 15 15 16 
Average /,.« « «=| 24144 35 606 51 05 |56 36 
Intervaly ee edi) eel O 22 38 38 37 |44 08 






During the long waves, at 13" 54-54.5™, we find the following earth-amplitudes indi- 
cated: (1) North, 0.8mm. ; (2) North, 0.97mm.; (3) East, 1.31mm.; (4) Vertical, 1.64 mm. 
at 135 52-53™; probably the total would be about 2mm. During the principal part: 
(1) North, 1.5mm. at 13" 59™ 20°; (2) North, 0.53 mm.; (3) East, 0.52 mm.; (4) Vertical, 
0.7 mm., at 14” 06.5". (2) and (3) give too small values for the pendulum struck against 
the stops during the large part of the principal part. It is to be noticed, however, that 
(1) gives a larger and (4) a smaller amplitude than during the long waves. Probably 
the maximum during the principal part was a little greater than 2 mm. 
COIMBRA, PORTUGAL. 
Observatorio Magnetico-Meteorologico. Prof. A. 8. Viegas, director. 
Lat. 40° 12’ N.; long. 8° 25’ W.; altitude, 140.3 meters; distance, 81.39° or 9,049 km.; 
chord, 8,307 km.; direction, N. 45° E. 
Foundation, Triassic sandstone. 
Seismograms, sheet No. 1. 
The instrument used was a Milne horizontal pendulum, east component; photo- 
graphic registration; V, 6.1; M, 255 gm. 
First PRELIMINARY | SECOND PRELIMINARY REGULAR 
TREMORS. TREMORS, WAVEs. Max. AMPLITUDE, 


min. min. min. 
™m. 8. mm, 
East component . . 25.4 39.0 50.5 55 58 16 
Interval . . . 12.9 22.5 38.0 

Duration, 3 hours. During the strong motion the period of the waves was about 24 
seconds; the proper period of the pendulum is not known and the actual magnification 
can not be determined. 
LEIPZIG, GERMANY. 
Kel. Geologisches Bureau. Prof. Dr. Hermann Credner, director; Dr. F. Etzwold, 
assistant. , 
Lat. 51° 20’ N.; long. 12° 23.5’ E.; distance, 82.40° or 9,161 km.; chord, 8,392 km.; 
direction, N. 26° E. 
Foundation, alluvium and sands. 
The instrument used was a Wiechert inverted pendulum, two components; mechanical 
registration on smoked paper. 
