July 4, 1878] 



NATURE 



265 



EARTHQUAKES ON THE PHILIPPINES IN THE YEAR 1876, ACCORDING TO THE PUB- 

 LICATION OF THE ''ATENEO MUNICIPAL" IN MANILA. COMMUNICATED BY DR. 

 A. B. MEYER, DRESDEN 



Date. 



January 19 



February 7 



10 



March 18 



18 



21 



April 

 June 



July 



31 

 14 

 12 

 12 

 iS 

 13 

 13 

 13 

 13 



„ 26 



» 26 



» 27 



August 10 



„ 21 



„ 22 



» 23 



September 13 



.. IS 



November 15 



17 

 17 

 17 

 18 



M 19 



„ 22 



f> 26 



I, 27 



December 12 



„ 12 



13 

 13 

 18 



», 20 



M 25 



M 25 



Hour. 



I A.M. 



4-5 A.M. 



7 A.M. 

 12.15 A.M. 

 II-I2P.M. 



5-6 A.M. 



2.25 P.M. 



2-3 A.M. 



12.45 A-M. 



II-I2P.M. 



? A.M. 



10.30 P.M. 



j> 

 lO-II P.M. 

 10.34 P-M- 



? A.M. 



4 A.M. 

 10 A.M. 



5-45 A.M. 

 I2-I A.M. 



ro-ii P.M. 



12.30 A.M. 

 10 A.M. 

 11.30 P.M. 

 7-8 A.M. 

 11.30 P.M. 

 night. 



4-5 A.M. 



8 P.M. 



noon. 



II. 5 P.M. 

 4.5 P.M. 



9-4S P-M- 



4 P.M. 

 11.45 P'M. 

 ? P.M. 

 4-5 A.M. 

 3 A.M. 

 9.23 A.M. 



Place. 



Vigan . . 



Iba . . . 



Laoag . . 



Vigan . . 



Benguet . . 

 Batangas 



Laoag . . 



Iba . . . 

 Nueva-Caceres 



Albay . . 



Laoag . . 



Iba . . . 



Cavite . . 



Bulacan . . 



Manila . . 



Tacloban 



Surigao . . 



Baler . . . 

 Nueva-Caceres 



Iba . . . 



j> . • • 



Vigan . . 

 Nueva-Cacerei 



Surigao . . 



Iba . . . 



Vigan . . 



Benguet . . 



Cayan . . 



Iba . . . 



Mobo . . . 



>» • • • 



Albay . . 



Manila . . 



Zamboanga 

 Baler . . 

 Zamboanga 

 Iba . . 

 Batangas 

 Calapan . 

 Manila . 



Province or District. 



Ilocos sur. 

 Zambales . 

 Ilocos norte 

 Ilocos sur. 

 Benguet . 

 Batangas . 

 Ilocos norte 

 Zambales . 

 Camarines, S 

 Albay . . 

 Ilocos norte 

 Zambales . 

 Cavite . . 

 Bulacan . 

 Manila 



Com. P. M. d. Principe 

 Camarines, S. • . . 

 Zambales 



>> 



Ilocos, S 



Camarines, S. . . . 



Zambales 



Ilocos, S 



Benguet 



Lepanto 



Zambales 



Albay 



Manila 



Com. P. M. d. Principe 



Zambales 



Batangas 



Manila 



Island. 



Luzon 



Leyte 



Mindanao 



Luzon 



Mindanao 

 Luzon 



Masbate 



>> 

 Luzon 



Mindanao 

 Luzon 

 Mindanao 

 Luzon 



>» • 

 Mindoro . 

 Luzon 



Direction. 



N.-S. 



N.-S. 



N.-S. 



N.N.E.-S.S.W. 



E.-W. 

 N.-S. 

 W.-E. 



V^.-E. 



N.E.-S.W. 



N.-S. 



N.-S. 

 S.E.-N.W. 



Remarks. 



Intensity 3°, sismometei 



2 mm. 

 Strong. 



Great eruption of Mount 



Tacbacon. 

 One shock, intensity 3 



mm. 

 Intensity i°, sismometer 



I mm. 



Intensity l°. 



If we take, with Dr. von Drasche (" Fragmente zu einer Geologic der Insel Luzon," Vienna, 1878), North Luzon to a little 

 north from 16° N., Central Luzon from there to about 14° 30' N., and South Luzon on the south of this line, we have 11 earth- 

 quakes in North Luzon, 15 in Central Luzon, 8 in South Luzon ; and on the islands mentioned — I on Mindoro, 2 on Masbate, 

 I on Leyte, and 4 on Mindanao. 



There were recorded in the year 1876, altogether 41 earthquakes on the Philippine Islands. 



SOME RESULTS OF THE SUPPOSITION OF 

 THE VISCOSITY OF THE EARTH^ 



CIR W. THOMSON'S investigation of the bodily tides of an 

 •^ elastic sphere has gone far to overthrow the idea of a semi- 

 fluid interior to the earth, yet geologists are so strongly impressed 

 by the fact that enormous masses of rock have been poured out 

 of volcanic vents in the earth's surface, that the belief is not yet 

 extinct that we live on a thin shell over a sea of molten lava. It 

 appeared to the author, therefore, to be of interest to investigate 

 the consequences which would arise from the supposition that 

 the matter constituting the earth is of a viscous or imperfectly 

 elastic nature. In this paper these hypotheses were followed 

 out, and the results were fully as hostile to the idea of any great 

 mobility of the interior of the earth as are those of Sir W. 

 Thomson. 



* Abstract of a paper on the bodily tides of viscous spheroids, by G. H. 

 Datwin. Read before the Royal Society, May 23. 



It is first shown that every problem about the strains of an 

 incompressible elastic solid has its analogue touching the flow of 

 an incompressible viscous fluid, and that the solution of Sir W. 

 Thomson s problem of the bodily tides of an elastic sphere may 

 thus be adapted to give the bodily tides of a viscous spheroid. 

 The state of internal flow of a viscous spheroid is then found, 

 under the joint influence of any external disturbing force and of 

 the mutual gravitation of the parts of the spheroid. 



When there is no disturbing force this gives the law of the 

 subsidence of inequalities on the surface of a viscous globe under 

 the influence of simple gravitation; and it is suggested that 

 some light may possibly be throvra thereby on the laws of geo- 

 logical subsidence and upheaval. It appears that inequalities of 

 wide extent will subside much more quickly than wrinkles, as 

 might have been expected from general considerations. 



The rate is found at which a rotating spheroid would adjust 

 itself to a new form of equilibrium, when its axis of figure is not 

 coincident with that of rotation ; and the law is established which 



