The Quarterly journal of the Geological Society of London . oa Journal August 10th, 1872. 5 Nature vol. xxiii (1881) p. 275 ; & Alloa Advertiser January 22nd, 1881. Yol. 6^.] OCHIL EARTHQUAKES OF 1900 TO 1907. 363 II. Description oe the Earthquakes. (1) 1900, September 17th, A slight shock was felt by several persons at Menstrie. (2) 1900, September 17th, slight shock was felt by several persons at Alva. (3) 1900, September 17th, Intensity, 4; centre of isoseismal 4, in lat. 56° 11-6 IS., long. 3° 505 of records, 56, from 26 places, and 13 negative reco
The Quarterly journal of the Geological Society of London . oa Journal August 10th, 1872. 5 Nature vol. xxiii (1881) p. 275 ; & Alloa Advertiser January 22nd, 1881. Yol. 6^.] OCHIL EARTHQUAKES OF 1900 TO 1907. 363 II. Description oe the Earthquakes. (1) 1900, September 17th, A slight shock was felt by several persons at Menstrie. (2) 1900, September 17th, slight shock was felt by several persons at Alva. (3) 1900, September 17th, Intensity, 4; centre of isoseismal 4, in lat. 56° 11-6 IS., long. 3° 505 of records, 56, from 26 places, and 13 negative records from 11 places(fig- 1). The boundary of the disturbed area (fig. 1, below) is an isoseismalline of intensity a little less than 4 (Rossi-Eorel scale). It is 15miles long, 9| miles wide, and 117 square miles in area. Thelonger axis runs from E. 13° K. to W. 13° S., and the centre ofthe area is 3 miles N. 8° E. of Menstrie. ° 0 I3°50long.^. 3°4l/ ^D Sept. 22^1900, Scale of 12 3 4 5 S%ggJ£. 56°10K ©Clackmannan All over the disturbed area, the shock consisted of a single pro-minent vibration, followed by a tremor, such as would be causedby a heavy weight falling on the floor and making the buildingshake. The duration of the shock was not more than 3 seconds. The sound was heard by 94 per cent, of the observers, and wascompared in 29 per cent, of the records with traction-engines, ; in 10 per cent., with thunder ; in 5, with wind; in 12, withthe fall of a load of stones, etc.; in 17, with the fall of a heavybody ; in 12, with blasting or explosions ; and in 15 per cent., withmiscellaneous sounds. The beginning of the sound preceded thatof the shock in 34 per cent., and coincided with it in 66 per cent., ofthe records ; while the end of the sound preceded that of the shockin 9 per cent, of the records, coincided with it in 77 per cent., and 364 BR. CHARLES DAVISON ON THE [Aug. I907, followed it in 14 per c
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