The coast of Caracas and the adjacent island of Trinidad were violently convulsed in 1776, and the whole city of Cumana was reduced to ruins. The shocks were continued for upwards of a year, and were at first repeated almost hourly. There were frequent eruptions of sulphurous water from fissures in the ground, and an island in the Orinoco disappeared. Rihamba must have stood, it would appear, almost immediately over the focus of the dreadful earthquake of February 4, 1797. This unfortunate city was situated in the district of Quito, not far from the base of the great volcano of Tunguragua. That mountain was probably the center of disturbance, and the shock was experienced with disastrous effects over a district of country extending about 120 miles from north to south and about sixty miles from east to west. Every town and village comprehended within this district was reduced to ruins. The shocks, however, were felt, though in a milder form, over a much larger area, extending upwards of 500 miles from north to south and more than 400 miles from east to west. At Riobamba the shocks, which began at about eight o'clock in the morning, are said to have been vertical. Some faint idea may be formed of the extreme violence of this motion from the fact mentioned by Humboldt that the dead bodies of some of the inhabitants who perished were tossed over a small river to the height of several hundred feet, and landed on an adjacent hill. Vertical movements, so powerful and so long continued, could not fail to produce an enormous displacement of the ground, and to be very destructive to all buildings which it sustained. The soil was rent, and, as it were, torn asunder and twisted in an extraordinary manner. Several of the fissures opened and closed again; many persons were engulfed in them; but a few saved themselves by simply stretching out their arms, so that, when the fissure closed, the upper parts of their bodies were left above the ground, thus admitting of their being easily extricated. In some instances whole cavalcades of horsemen and troops of laden mules disappeared in those chasms; while some few escaped by throwing themselves back from the edge of the cleft.