Craterlets formed during the Calabrian earthquake of 1783.

Craterlets

Craterlets formed during the Calabrian earthquake of 1783.

On August 31, 1886, Charleston was nearly destroyed by an earthquake measuring 7.5 on the Richter scale that was felt as far away as Boston and Bermuda.

Results of the Earthquake in Charleston S.C., Aug. 31, 1886

On August 31, 1886, Charleston was nearly destroyed by an earthquake measuring 7.5 on the Richter scale…

Model of a part of the path traveled by a particle on the earth's surface during the earthquake of Tokyo, January 15, 1887.

Earthquake Path

Model of a part of the path traveled by a particle on the earth's surface during the earthquake of Tokyo,…

The Lisbon earthquake of 1755. It destroyed a great part of the city and its 60,000 inhabitants.

Lisbon Earthquake

The Lisbon earthquake of 1755. It destroyed a great part of the city and its 60,000 inhabitants.

Shifts in the two obelisks in the convent of St. Bruno, Calabrian earthquake of 1783.

Obelisk Shifts

Shifts in the two obelisks in the convent of St. Bruno, Calabrian earthquake of 1783.

One of the seismograms of the Messina earthquake of December 28, 1908, as registered at Gottingen, Germany.

Seismogram

One of the seismograms of the Messina earthquake of December 28, 1908, as registered at Gottingen, Germany.

Diagrammatic view, from above, of a seismograph.

Seismograph

Diagrammatic view, from above, of a seismograph.

The Ewing seismograph, constructed to record all three movements. Three pendulums are arranged to swing in the manner of a bracket or a gate, in three planes, at right angles to one another. Two of them are placed vertically and oscillate in a horizontal manner.

The Ewing Seismograph

The Ewing seismograph, constructed to record all three movements. Three pendulums are arranged to swing…

"Seismoscope. a, heavy mass supported by loop at point near center of gravity; b, point on which upper side of loop rests; c, long needle projecting from upper side of loop; d, conducting-wire; e, binding-post; f, long arm of lever pivoted at k; g, point where end of lever rests on end of needle; h, mercury-cup." -Whitney, 1911

Seismoscope

"Seismoscope. a, heavy mass supported by loop at point near center of gravity; b, point on which upper…