86 REPORT OF THE CALIFORNIA EARTHQUAKE COMMISSION. 
First SECOND 
PRELIMINARY | PRELIMINARY 
TREMORS. TREMORS. 
REGULAR 
WAVES. AMPLITUDE, 
min. min. min, 
mm, 
East component. . 25.1 35.3 48.5 or 53.7 cs. no u 
Interval ... 12.6 22.8 36.0 or 41.5 


The identification of the beginning of the regular waves is very doubtful. 
TORTOSA, SPAIN. 
Observatorio del Ebro. P. R. Cirera, S. J., director. 
Lat. 40° 49’ N.; long. 0° 30’ E.; altitude, 38 meters; distance, 85.65° or 9,522 km.; 
chord, 8,660 km.; direction, N. 39° E. 
Foundation, solid rock ; cretaceous strata. 
The instrument used was a Vicentini microseismograph, two horizontal components ; 
mechanical registration on smoked paper. T,, 1.8 seconds; V, 180; J, 1,450 meters; 
M, 100 kg.; LZ, 1.43 meters. 

























First SECOND 
REGULAR EartTuH’s 
PRELIMINARY|PRELIMINARY Max, AMPLITUDE. Prriop. 
TREMORS. TREMORS. WAVES. AMPLITUDE. 
‘Mm 8. m. iS: ie CE min, mm. sec. mm. 
AV Cra Gan an meen. 24 55 36 600 55 00 18.0 3 16.4 1.36 
Interval : TE eure 23 32 42,32 





Duration, 2.5 hours. If both components have the same maximum amplitude at the 
same time, the total earth-amplitude might be 1.82 mm. 
KREMSMUNSTER, AUSTRIA. 
Observatoire des Benedictines. P. Franz Schwab, director. 
Lat. 48° 03’ N.; long. 14° 08’ E.; altitude, 380 meters; distance, 85.77° or 9,535 km. ; 
chord, 8,670 km.; direction, N. 27° E. 
Foundation, about 20 meters of glacial till lying on Tertiary strata. 
Seismograms, sheet No. 2.7 
The instruments used were Ehlert horizontal pendulums (triple); photographic regis- 
tration. 
(1) N. 18° W. component: 75, 10 seconds; V, 81.4; J, 2,000 meters; ¢, 1.0; Z, 10cm. 
(2) N.47° E. component: 79,10 seconds; V, 76.7; J, 1,900 meters; e, 1.0; Z,10cm. 
(3) N. 73° W. component: 79, 10 seconds; V, 81.4; J, 2,000 meters; ¢, 1.0; LZ, 10 cm. 
First SECOND PrinciaL 
M 
pen AMPLITUDE, 

3 
S. 
min. min. 
(1) N. 18° W. component . 38.3? 01.9? 
(2) N. 47° E. component . 

(3) N. 73° W. component . 
ES NE 
oor OOwow 
SUS Sure SO 
CON WOODHAM’ 

Average 
Interval 



’ The middle record of the seismogram records the N. 47° E. component of the motion and not the 
N. 47° W. component as indicated. 
