1915-16.] The Ochil Earthquakes of the Years 1900-1914. 263 
(20) 1906, September 28, 12.25 p.m. 
A slight shock, with sound, observed at Blairlogie, Menstrie, and Red 
Carr. 
(21) 1906, October 3, 4.32 a.m. 
A shock, strong enough to awaken several observers, felt at Blairlogie 
and Menstrie. The accompanying sound was like a cannon-shot. 
(22) 1906, October 8, 7.24 a.m. 
Intensity, 5 ; centre offisoseismal 4 in lat. 56° 10'-9 N., long. 3° 5T’3 W. ; 
number of records, 23, from 14 places, and 8 negative records from 6 places 
(fig. 4). 
The disturbed area is bounded by an isoseismal of intensity 4, which 
is 12 miles long, 9J miles wide, and 90 square miles in area. Its centre is 
2 miles north of Menstrie. At Logie, Menstrie, and Tillicoultry the shock 
consisted as a rule of one prominent vibration, its intensity being 5. The 
sound was heard by 86 per cent, of the observers, and in 57 per cent, of 
the records was compared to the dull concussion caused by the fall of a 
heavy body. 
