Nogués, A.F., 101 Oddone, E., 175 Offret, A., 76, 158, 159, 175 Oglialoro, A., 73 Oldham, R.D., 262-320, 337, 340 Omori, F., 19, 20, 177, 183-186, 188, 197-199, 207, 214, 262, 325, 327, 329, 331 Origin of earthquakes, 2, 5, 345; of Neapolitan earthquake, 41; of Ischian earthquakes, 70; of Andalusian earthquake, 101; of Charleston earthquake, 134; of Riviera earthquakes, 174; of Japanese earthquake, 211; of Hereford earthquake, 240; of Inverness earthquake, 255; of Indian earthquake, 317 Overturned bodies, maximum acceleration deduced from, 184, 272 Palmieri, L., 57, 72, 73 Periodicity of Japanese after-shocks, 199 Perrey, A., 7 Potenza, evidence of damaged church at, 15, 26 Prediction of earthquakes, possible, 322 Preparation for earthquakes, 40, 57, 76, 107, 142, 201, 238, 246, 321 Rails, flexure of, by Charleston earthquake, 112; by Japanese earthquake, 182; by Indian earthquake, 288 Railway-tunnels, observations of Riviera earthquake in, 166 Rebeur-Paschwitz, E. von, 281 River-beds, rise of, caused by Indian earthquake, 290 Riviera earthquake, investigation, 138; damage caused by, 139; preparation for, 142; isoseismal lines and disturbed area, 143; position of epicentre, 146; depth of principal focus, 149; nature of shock, 150; sound-phenomena, 156; the unfelt earthquake, 157; effects of earthquake at sea, 162; destruction of fishes, 162; seismic sea-waves, 163; connection between geological structure and intensity of shock, 164; observations in railway-tunnels, 166; after-shocks, 167; recent movements in the Riviera, 170; seismic history of the Riviera, 171; origin of, 171; bibliography, 175 Rocca di Papa, record of Indian earthquake at, 281, 282, 285 Rossi, M.S. de, 57, 74, 82, 101, 175 Rossi-Forel scale of seismic intensity, 104, 216, 247 Rotation of pillars, caused by Hereford earthquake, 294; by Indian earthquake, 293; explanation of, 295 Rudzki, P., 336 Rumi, Prof., 169 Samin, fault-scarp at, 308 Sand-craters caused by Charleston earthquake, 130; by Indian earthquake, 288 Schmidt, A., 336 Seismic sea-waves of Riviera earthquake, 142, 163 Seismic vertical, 12, 29, 62 Seismographic records of Riviera earthquake, 154; of Japanese earthquake of 1894, 329 Sekiya, S., 18, 19 Serpieri, A., 74 Shillong, nature of Indian earthquake at, 266 Sloan, E., 103, 117-119, 134, 135 Sound-area, definition of, 3; of Neapolitan earthquake, 38; of Andalusian earthquake, 92; of Hereford earthquake, 234; of Inverness earthquake, 252; of Indian earthquake, 275