ON SEISMO LOGICAL INVESTIGATIONS. 



43 



List of Strong Shocks — continued. 



Date 



1868 Oct. 21, 



7.50 A.M. 



1869 Oct. 22, 



6 A.M. 



1869 Dec. 27, 

 2.10 A.M. 



1872 March 26 



1872 Dec. 10, 

 4.30 p.m. 



1875 Dec, 



8-9 p.m. 



1877 Oct. 12, 



1.53 p.m. 



1878 Aug. 29 



1881 April 10, 

 2.05 to 

 2.10 a.m. 



Place 



1882 Sept. 7 



1886 



Aug. 31, 



E.S.T., 



9.51.06 



p.m. 



1889 July 19 . 



1894 July 18, 

 M.S.T., 

 3.50 p.m. 



1896 May 



1898 March 30, 

 P.S.T. 

 11.42.15 



F.M. 



San Francisco 

 and neighbour- 

 hood, California 



Intensity 



III 



Remarks 



All over New 

 England States 



Sacramento, Cali- 

 fornia 



Marysville, Cal. 



Inyo County, 

 California 



Helena and Deer 

 Lodge, Mont. 



Porto Rico 



Portland, Ore- 

 gon 

 Makuslin, Alaska 



Santa Clara Val- 

 ley and Valley 

 of California 



Panama, C.A. . 



Charlestown and 

 Summerville, 

 S.C. 



Memphis, Tenn. 

 Ogden, Utah 



Orca, Alaska . 

 Mare Island, Cal. 



II 



I 

 HI 



III 



I-II 

 III 



I 



K?) 



IK?) 

 I 



Due to movement oil the Haywards 

 fault, east of San Francisco Bay. 

 At the corner of Market and First 

 Streets, San Francisco, the ground 

 opened several inches wide for a 

 distance of forty to fifty feet. 

 The earthquake was severe in the 

 interior. Felt at Sacremento and 

 Stockton ; at Redwood City, 

 where the court-house was wrecked; 

 Marysville, Grass Valley, and 

 Sonora also felt the shock. (See 

 Rep. Cal. Eq. Com., vol. i., pt. 2, 

 pp. 434^48. ) (R. , xlvi. , p. 428. ) 



With an intensity of III. at Frederick- 

 town, New Brunswick. (B., p. 22.) 



(H., p. 84.) 



Movement on fault. (See Holt's 

 book.) (H., pp. 88-92.) 



Two shocks of five seconds' duration, 

 direction West to East. (R., v., 

 p. 262.) 



Town of Arecibo nearly destroved. 

 (N.W. Porto Rico). (R., xii., 

 p. 29.) 



Two shocks. (R., xv., p. 25 ; H., 

 p. 100.) 



Town reported destroyed. (R., 

 xvii., p. 16.) 



The centre seems to be in San Joaquin 

 County ; VII- VIII at Modesto ; 

 VI-VII at Stockton; VI at 

 Merced ; VI at lone City ; III-IV 

 at Visalia. In the Santa Clara 

 Valley, VI; at Hollister, VI; 

 V at Salinas, Centerville, San 

 Jose ; IV at San Francisco. There 

 may have been two centres of 

 disturbance, one near Modesto and 

 one near Hollister. Felt probably 

 over an area of 15,000 square 

 miles. (S.) 



Shocks continued for three or four 

 weeks. (S.) 



See Ninth Annual Report U.S. 

 Geol. Survey. (Dutton.) 



(H, p. 228.) 



Very severe. (M.) 

 (McA., pp. 11-12.) 



