OBSERVATORIES AND THE DATA OBTAINED. 93 
FLORENCE (XIMENIANO), ITALY. 
Osservatorio Ximeniano. P. G. Alfani, 8. J., director. 
Lat. 438° 47’ N.; long. 11° 15’ E.; distance, 88.23° or 9,808 km.; chord, 8,868 km.; 
direction, N. 31° E. 
Foundation, alluvium. 
Seismograms, sheet No. 6. 
The instruments used were: 
Stiattesi horizontal pendulums. (1) North and (2) east components: T,,, 40 seconds ; 
V, 30; J, 12,000 meters; M, 500 kg.; L, 1.50 meters. 
Vicentini microseismograph. (3) North and east components: T,, 2.4 seconds; 
V,100; J, 148 meters; M, 450 ke.; L, 1.43 meters. 
Omori tromometrograph. (4) Northeast and (5) northwest components: 7',, 36 sec- 
onds; V, 25; J, 8,100 meters; M, 250 kg.; L, 50 cm. 
All have mechanical registration on smoked paper. 













First SECOND 
PRELIMINARY|PRELIMINARY 
TREMORS. TREMORS. 




INCIPAL 
Princ Max. 
ian PrrRIop. 





m. a: m 8. m. s. | min. 
26) 20 of 8S 49 20 10.0 
26. 25 of 420 45 10 07.0 




(1) North component . 
(2) East component 







96 25 | 37 05 | 56 00 | 59° 50 
26 25 | 36 56 | 48 15 | 10 55 
26 25 | 36 45 | 47 25108 05 
26.25 | 37 04 
13 57 | 24 36 
(3) North and east components 
(4) Northeast components 
(5) Northwest component 
Average 
Interval 















There are no time marks on the record of the Omori instruments, (4) and (5). Assum- 
ing the time of beginning to be the same as that given by the other instruments, the times 
of the later phases are obtained from the rate of rotation of the recording drum. 
ZAGREB (AGRAM), HUNGARY, 
Seismological Observatory. Prof. Dr. Mohorovicsics. 
Lat. 45° 49’ N.; long. 15° 59’ E.; distance, 88.33° or 9,820 km.; chord, 8,877 km.; 
direction, N. 27° E. 
The instrument used was a Vicentini-Konkoly vertical pendulum, two horizontal com- 
ponents; mechanical registration on smoked paper. (1) North and (2) east compo- 
nents. The constants are assumed to be about the same as those for O’Gyalla, namely: 
T,, 2.5 seconds; V, 40; J, 62 meters; M, 105 kg.; L, 1.55 meters. 
EartTH’s 
First SECOND 
PrRIopD. AMPLI- 
PRELIMINARY|PRELIMINARY 
TREMORS. TREMORS. 
PRINCIPAL 
Part. 

& ™m, 8. ™m. 8. 
33 | 35 21 | 53 16 
™ 
(1) North component. . .| 25 
(2) East component . . .| 25 17 35 42 | 53 16 
AVeTageiie ev at). ode 25-—25 35. 31 53. 16 
luntrralg 9G 6 oe ie | UA Ge 23 038 | 40 48 








The earth-amplitudes are quite uncertain on account of the uncertainties of the 
constants of the instrument. 
The times, periods, and amplitudes are taken from the “Bulletin hebdomadaire des 
observatoires sismiques de la Hongrie et de la Croatie.”’ 
