. La rivista trimestrale della Geological Society di Londra. A nord-ovest e 3 * 0 e 5 * 0 miglia a sud-eastside. Tenendo conto di un possibile errore nella tracciatura di thesecurves, ne segue che il guasto originario deve, in neigh bourhood-del fuoco, eseguire circa N. 25° E. e S. 25° W., hade 230 DK. CHAELES DAVISON SUL [maggio 1904, verso nord-ovest e si intersecano la superficie lungo un linepassing vicino, o ad una breve distanza a sud-est di Hognaston.epicentro, o il capo di una parte di esso, evidentemente si trova hetween idue epicenters dei principali terremoto (Marzo 24th)

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. The Quarterly journal of the Geological Society of London. north-west side, and 3*0 and 5*0 miles on the south-eastside. Taking account of possible error in the tracing of thesecurves, it follows that the originating fault must, in the neigh-bourhood of the focus, run about N. 25° E. and S. 25° W., hade 230 DK. CHAELES DAVISON ON THE [May 1904, towards the north-west, and intersect the surface along a linepassing near, or a short distance to the south-east of Hognaston.The epicentre, or the chief part of it, evidently lies hetween thetwo epicentres of the principal earthquake (of March 24th) ; whilethe displacement towards the east or south-east of the isoseismal lineswith respect to those of the principal shock shows that, if connectedwith the same fault, the focus must have been situated much nearerto the surface. The latter inference is also supported by thecloseness of the isoseismals, which is indicative of a rapid decline inintensity from the epicentre outwards. Fig. 2. -Map of the Derby earthquake of May 3rd, 1903. p.*-- I Alfre°tLn. Derby Scale of 3Iiles0 -J 4 6 8 Kature of the Shock. In most places, the shock is described as a sudden shiver or shorttremor, its average duration being about 3^ seconds. Of the 36observers who refer to the nature of the shock, 29 distinctly statethat it consisted of only one part, and the remainder do not enterinto details. The shock was, therefore, not a twin, but due to adisturbance within a single continuous focus. Vol. 60.] DERBY EARTHQUAKES OF 1903. 231 Sound-Phenomena. The boundary of the sound-area is shown by the dotted curve infig. 2. Towards the south, its course is somewhat uncertain, butit probably does not deviate by more than a fraction of a mile fromthe position there laid down. The boundary, as drawn, is 24 mileslong, 17 miles wide, and contains about 320 square miles. Thesound was heard by 92 per cent, of all the observers. It wascompared to passing traction-engines, etc., in 45 per cent, of therecords, to

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1840
• booksubjectgeology
• bookyear1845