Earthquakes in the Light of the New Seismology |
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acceleration after-shocks alluvia amplitude Arica axis cause centre centrum CHAPITRE Charleston earthquake Charleston Quake coast cracks curves degree density depth dislocation displacement distance district disturbance downthrow earth earth-mass earthquakes elastic energy epicentre epicentrum epifocal eruption felt force frequency g sh sl greater ground Hooke's law Horizontal Pendulum hundred increases indicate instruments intensity investigation Isostasy Japan kilometres kilometres per second Krakatoa less lever means measure miles Milne's minutes Montessus movement normal wave number of quakes observed occur ocean Omori origin oscillation particle period phase portion preliminary tremor Professor Milne proportional ratio records Robert Mallet rocks Rossi-Forel scale sea-waves seaquakes Seismes generaux seismic seismic regions seismograph Seismological seismometer sh sl sg shaken shock speed of propagation square square kilometres steady-point surface syzygies tectonic tilting tion Tokio Totaux trace transverse wave vertical motion vibrations Vicentini volcanic volcanic action
Popular passages
Page 172 - ... their dwellings. VII. Strong shock. — Overthrow of movable objects; fall of plaster; ringing of church bells; general panic; without damage to buildings. VIII. Very strong shock. Fall of chimneys; cracks in the walls of buildings. IX. Extremely strong shock. — Partial or total destruction of some buildings. X. Shock of extreme intensity. — Great disaster; ruins; disturbance of the strata, fissures in the ground; rock falls from mountains.
Page 171 - Microseismic shock. — Recorded by a single seismograph or by seismographs of the same model, but not by several seismographs of different kinds; the shock felt by an experienced observer.
Page 41 - Lines 120 geographical miles in extent in running in an easterly or southeasterly direction from the highlands of Japan into the Pacific Ocean, like similar lines drawn from the Andes westwards into the same ocean, have a slope of 1 in 20, or 1 in 30, and in both of these districts earthquakes are frequent.
Page 171 - Recorded by a single seismograph or by seismographs of the same dole, but not by several seismographs of different kinds; the shock felt by an experienced observer. II. Extremely feeble shock. — Recorded by several seismographs of different kinds; felt by a small number of persons at rest. III. Very feeble shock. — Felt by several persons at rest; strong enough for the direction or duration to be appreciable. IV.
Page 173 - Rather strong, felt generally indoors, but by few outside, with waking of those asleep, with alarm of some persons, rattling of doors, ringing of bells, rather large oscillation of suspended objects, stopping of clocks.
Page 150 - While engaged in his usual duties, on the second floor of The News and Courier building, at the time of the first shock, the writer's attention was vaguely attracted by a sound that seemed to come from the office below and was supposed for a moment to be caused by the rapid rolling of a heavy body, as an iron safe or a heavily laden truck, over the floor. Accompanying the sound, there was a perceptible tremor of the building, not more marked, however, than would be caused by the passage of a car...
Page 150 - The long roll deepened and spread into an awful roar, that seemed to pervade at once the troubled earth and the still air above and around. The tremor was now a rude, rapid quiver, that agitated the whole lofty, strong-walled building as though it were being shaken — shaken by the hand of an immeasurable power, with intent to tear its joints asunder and scatter its stones and bricks abroad, as a tree casts its over-ripened fruit before the breath of the gale.
Page 41 - Andes westwards into the same ocean, have a slope of 1 in 20, or 1 in 30, and in both of these districts earthquakes are frequent. On the contrary, along the faces of flexures which are comparatively gentle, being less than half...
Page 171 - Fairly strong shock: general awakening of those asleep, general ringing of bells; oscillation of chandeliers; stopping of clocks; visible agitation of trees and shrubs; some startled persons leave their dwellings.
Page 172 - Slight, felt by several persons, but by few relatively to the number of inhabitants in a given place; said by them to have been hardly felt, without causing any alarm, and in general without their recognising it was an earthquake...