The Carlisle Earthquakes of July 9th and 11th, 1901

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Abstract
The chief title to interest possessed by the Carlisle earthquakes of 1901 is the light which they throw upon the structure of the region underlying the Lake District and the North of Cumberland —a structure which must clearly be very different from that manifested by the surface-rocks. The shocks were at least four in number. The first and strongest occurred on July 9th, at 4.23 p.m.; the second about three minutes later; the third on the same day at 4.45 p.m.; and the fourth on July 11th at about 11.10 p.m. In addition, there are records of four other shocks, depending on the authority of single observers. These are as follows:— July 9th, about 3 p.m.: Loweswater. A slight shock. July 10th, about 1.30 a.m.: Crosthwaite (near Keswick). A slight shock without sound. July 12th, about 2 a.m.: Crosthwaite. The same. July 14th, about 11 p.m.: Crosthwaite. The same. a. July 9th , 4.23 P.M. Intensity, 5 centre of isoseismal 5, 1at. 54° 47·8' N., long. 3° 0·4' W. Number of records 267, from 155 places; and negative records fi'om 50 places. Isoseismallines and disturbed area.—The two continuous curves in the map (p.372) refer to this earthquake. The isoseismal 5 is very nearly a circle, 29 miles in diameter, and 660 square miles in area. Its centre is situated at a point 7 miles south-south-west of Carlisle. The isoseismal 4 is an

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