Occasionally, the likeness was still closer, in the succession of sound, subsultory motion and concluding horizontal undulations.    From Wordnik.com.  [A Study of Recent Earthquakes] Reference

Outside the ruinous zone, the first phase rapidly lost what remained of its subsultory form, and the pause between the two parts was noticeably longer than near the epicentre.    From Wordnik.com.  [A Study of Recent Earthquakes] Reference

In the second zone (Fig. 19), the same two phases were universally observed, but the subsultory movement was less pronounced or the movement was partly subsultory and partly undulatory, and occasionally both phases are described as undulatory.    From Wordnik.com.  [A Study of Recent Earthquakes] Reference

Zafarraya, a loud sound like thunder was first heard, and before it ceased there came a violent subsultory movement preceded by a very brief oscillation, then a pause of one or two seconds, and lastly a more intense and longer series of undulations, the whole movement lasting 12 seconds.    From Wordnik.com.  [A Study of Recent Earthquakes] Reference

At Polla, for instance, which lies close to the north-west epicentre, the first warning was given by a rushing sound; almost instantly, and while it was yet heard, came a strong subsultory or up-and-down movement, succeeded after a few seconds, but without any interval, by an undulatory motion.    From Wordnik.com.  [A Study of Recent Earthquakes] Reference

I felt hardly any, if any, subsultory movement, but as I leant upon the balcony rails, I was alternately pressed against them and then drawn away. ".    From Wordnik.com.  [A Study of Recent Earthquakes] Reference

Pennella, and Lower Lacco, the subsultory movement was still the more prominent; but, farther away, as at Panza, Testacchio, Barano, Ischia, and Bagno, the subsultory motion was followed by distinctly horizontal undulations, while outside the island of Ischia only slow undulatory movements were perceptible.    From Wordnik.com.  [A Study of Recent Earthquakes] Reference

At Oneglia, for instance, there were two well-marked phases, the first of which began with a brief subsultory movement, followed by more horizontal undulations of longer period; a pause, lasting but for an instant, was succeeded by vibrations which, though not vertical, were highly inclined to the horizon; they continued throughout the second phase, but, towards the end, new undulations were superposed, and these, coming from different directions, resulted in an apparently vorticose movement.    From Wordnik.com.  [A Study of Recent Earthquakes] Reference