Dr. C. Davison — British Earthquakes. 539^ 



of the shock in 40 per cent, of the records, and followed it in 

 60 per cent. In every case the duration of the sound was greater 

 than that of the shock. 



We may infer, from the seismic evidence, that the mean direction 

 of the originating fault is from E. 36° N. to W. 36° S. Its hade is 

 probably to the north-west, and, if so, the fault must pass a short 

 distance to the south-east of the centre of the isoseismal 5, and 

 probably not far from Strontian. It is possible, however, that the 

 coui'se of the isoseismal 5 is not drawn with sufficient accuracy to 

 determine the hade of the fault. Mr. Home kindly informs me that 

 " the ground has not been surveyed west of Strontian, but the 

 ground between Loch Eil and Glen Gower has been finished and 

 west to Glen Strontian." No faults, he adds, have been detected 

 in the position indicated above, though the Great Glen fault sends 

 off a branch along the west side of Loch Linnhe. 



Bala Earthquake : July 1, 1903. 



Time of occurrence, 1.16 a.m.; intensity, 4; number of records, 

 10, from 5 places, and 3 negative records from 3 places. 



Most of the records on which this brief account is founded' 

 I owe to the kindness of Mr. T. Buddy, of Pale, near Corwen. 

 The five places at which the shock was felt are Bala, Brynbwlan, 

 Llandderfel, Pale, and Tynddynllaii (near Llandrillo) ; and the 

 three places from which no records are forthcoming are Bryn 

 Tegid, Eryl Aran, and Ehos-y-gvvaliau. All of the first five places 

 lie close to the great Bala fault, and it is probable that the earthquake 

 was caused by a slip along this fault or one of its branches. The 

 connection with the fault cannot, however, be considered as proved; 

 for the observations do not provide sufficient places for determining 

 the boundary of the disturbed area. The length of this area in 

 the direction of the fault is about 7 miles. 



Mr. Ruddy described the shock at Pale as consisting of a single 

 series of horizontal vibrations, lasting 4 or 5 seconds, increasing in 

 intensity to a maximum and then dying away, the direction of the 

 movement being from west to east. It was accompanied by a rushing 

 noise, which other observers compared to thunder or the beating 

 noise of a motor-car. 



Doubtful Earthquakes. 



Two slight shocks were felt on October 19 and 22, 1901, in the 

 district surrounding Framlingham, a small town in Suffolk about 

 14 miles north-east of Ipswich. 



Framlingham Eartli-shake : Oct. 19, 1901. — Time of occurrence, 

 about 7.25 p.m. ; intensity, 4 ; centre of isoseismal 4 in lat. 

 52° 12-6' N., long. 1° 15-0' E. ; number of records, 18, from 11 

 places, and 27 negative records from 23 places. 



With one exception, the places where the shock was felt are 

 included within a nearly circular area 6J miles long from east 

 to west, 6 miles wide, and containing 31 square miles. Both shock 

 and sound were observed at Kendlesham, 2A- miles south of the 



