1915-16.] The Ochil Earthquakes of the Years 1900-1914. 269 
the observers within the isoseismal 6, by 87 per cent, of those outside that 
isoseismal, and by 92 per cent, of those in the whole disturbed area. It is 
compared to passing waggons, etc., in 47 per cent, of the records, to thunder 
in 27, to the fall of a heavy body in 17, and to explosions in 10 per cent. 
(62) 1908, October 20, 4.13 p.m. 
Intensity, 5 ; centre of disturbed area in lat. 56° 1T*3 N., long. 3° 48'‘0 W. ; 
number of records, 18, from 13 places (fig. 5). 
The boundary of the disturbed area (represented by the broken line in 
fig. 5) coincides nearly with the isoseismal 6 of the preceding earthquake, 
except that it is displaced about half a mile to the west-south-west. It is 
15 miles long, 10 \ miles wide, and contains about 123 square miles. Its 
centre is 3 miles E. 50° N. of Menstrie, and half a mile west-south-west of 
that of the isoseismal 6 of the preceding earthquake. Its longer axis is 
directed E. 25° N. The intensity of the shock was 5 at Tillicoultry. The 
shock was merely a brief tremor, lasting about 1J seconds, without any 
prominent vibration or “ thud.” The sound was compared to thunder or 
an explosion. 
(63) 1908, October 20, 9.26 p.m. 
A very slight shock, felt at Airthrey and Menstrie. At Airthrey the 
sound and vibration began together and terminated simultaneously in a thud. 
(64) 1908, November 6, 4.45 p.m. 
A noise, heard at Menstrie. 
(65) 1909, January 19, 5.28 a.m. 
A shock (intensity 4), accompanied by a loud sound, felt at Airthrey, 
Alva, and Menstrie. 
(66) 1909, January 19, 5.29 a.m. 
A shock, felt at Menstrie. Two other tremors were also felt at Alva 
after 5.28 a.m., but the times were not recorded. 
(67) 1909, January 23, 12.15 p.m. 
A slight shock (intensity 3), accompanied by a noise like that of an 
underground explosion, felt at Airthrey and Menstrie. 
(68) 1909, January 24, 12.15 p.m. 
A shock (intensity 3), felt at Menstrie. 
