The Quarterly journal of the Geological Society of London . trie. (25) 1906, October 20th, A slight tremor and sound were observed at Airthrey. (26) 1906, October 24th, A report, like that of a distant cannon, was heard generally atMenstrie. (27) 1906, October 26th, A slight shock was felt at Airthrey and Menstrie : at the latterplace it consisted of two vibrations, at the former it was accompaniedby sound. (28) 1906, October 30th, A slight shock and sound were observed by a few persons atMenstrie. (29) 1906, December 28th, Intensity, 6; centr
The Quarterly journal of the Geological Society of London . trie. (25) 1906, October 20th, A slight tremor and sound were observed at Airthrey. (26) 1906, October 24th, A report, like that of a distant cannon, was heard generally atMenstrie. (27) 1906, October 26th, A slight shock was felt at Airthrey and Menstrie : at the latterplace it consisted of two vibrations, at the former it was accompaniedby sound. (28) 1906, October 30th, A slight shock and sound were observed by a few persons atMenstrie. (29) 1906, December 28th, Intensity, 6; centre of isoseismal 4, in lat. 56° 113 N., long. 3° 51*0 of records, 10, from 7 places, and 5 negative records from 5 places(fig. 3, below). The average of 7 estimates of the time is The shock,which consisted of two prominent vibrations followed by a tremor,was felt at Airthrey, Alva, Burnside Farm (Braco), Dunblane, upo7 13050long, w: ~~ 13040 Fig. 3. Earthquakes op ;,A2TDDec, 30™1906. oBIackford Scale of 12 3 4. cClackmannan Menstrie, Bed Carr, and Tillicoultry; its intensity was 4 at Airthrey,Dunblane, Eed Carr and Tillicoultry, and 6 (according to threeobservers) at Menstrie. The disturbed area was probably about11 miles long, 8| miles wide, and contained about 74square miles;Q. J. G. S. No. 251. 2 c 370 DR. CHARLES DAVISON 01* THE [Aug. 1907,. its centre being 2| miles north of Menstrie. The sound was heardby 78 per cent, of the observers, and was generally compared withthe fall of a heavy body or with an explosion. From the rapiddecline in intensity of the shock outwards from Menstrie, it followsthat the focus was situated at a slight depth and that the epicentrewas close to Menstrie. (30) 1906, December 29th, A slight shock, accompanied by a noise like the fall of a heavjrbody, was felt at Airthrey. (31) 1906, December 30th, about 1 shock, which woke several people, was felt at Menstrie. (32) 1906, December 30th,
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