( 41() ) 



Year 



Entire 

 number 

 of earth- 

 quakes 



Distribution over the year 



Volcanic phenomena 



1899 



1900 



1901 



1902 

 1903 



1904 



1905 

 1906 



1907 

 1908 



12 



morethan 

 20 



11 



212) 



14 



25 



10 



On 21 May ; and on 30 Sept. 

 Oh 17'" Bat. t. 'Heavy 

 shock of rather long dura- 

 tion vert, and horizont. 

 W/E" (Goedbloed). Possi- 

 bly connected with the 

 great earth-quake of Ce- 

 ram on 29/30 Sept. 



Jan. 2; Febr. 2; April 2'); 

 May 2'); June 2; Sept. 2'). 



Swarms from 2 u.a.i. 8 Febr.; 

 Since still 17 or more; viz. 

 6 from 9 u. a. i. 24 Febr.; 

 2 on 1 and 16 March; 4 from 

 6 u. a. i. 7 April ; 3 from 10 

 u.a.i. 21 Sept.; 2 in Oct. 

 and Nov. 



Febr. 4; March 2 ; May, July, 

 •Sept. Oct. and Dec. each 1. 



Jan. 4 ; July 1 ; Aug. 3; Sept. 

 1; 8 from 28 Oct. u. a. i. 26 

 Nov.; Dec. 1. 



1 on 24 Febr.; 5 from 1 1 u.a. 

 i. 2') March; 1 on 19 May; 

 1 on 31 July; 10 from 18 

 Aug. u. a. i. 27. Sept.; Nov. 

 I and Dec. 2. 



3 from 22 u.a.i. 26 Jan.; on 

 16 Febr.; on 5 and 23 May ; 

 on 21 June and on 17 Aug. 



On 13 Jan.; 5 from 24 Jan. 

 u.a.i. 7 Febr.; on 25 Febr.; 

 on 22 March; 25 and 29 

 April; 17 June; 22 Aug.; 

 5 Sept. and 18 Dec. 



6 from 26 Jan. u.a.i. 1 1 Febr.; 

 5 from 19 u.a.i. 30 March; 

 12 from 10 June u a.i. 23 

 July; on 3 Oct. and 26 Dec. 



In Jan. 2; in April 2; in 

 May 2; in Aug. 2; Sept. 1 

 and Oct. I. 



Eruption Siaoe on 21 Dec. 



Formation of the new solfatare on 

 Sopoetan, beginning February. 



Submarine volcanic phenomena near 

 Mahengetan on 17 and 18 April 

 and 27 Aug. Roeang since 23 April 

 especially on 1 16 Sept. Mahawoe 

 beginning Oct. 



Siaoe 21 and 22 May ash-shower. 



Roeang 21 29 May sounds and vibra- 

 tions and on 23/24 May eruption? 

 and stream of water. 



Sopoetan-mounlains: Middle (17) 

 June beginning of the out-break 

 from the new crater. 



Sopoetan-mountains. Resuming of 

 the activity of the new crater since 

 5 June (and on 7 June and 25 June). 



1) One of which recorded by the seismograph at Batavia ; the one of April perhaps 

 originating in the neighbourhood of Karakelang, (Sangi- and Talaoet-islands). 



2) On 20/21 Sept. midnight, on 21 Sept. ± 12'' and on 22 Sept. 13'' 30>" and 16'' 

 repeatedly dull sounds observed by me. 



Utrecht, Mei 1911. 



