VOLCANIC EARTHQUAKES 113 
1302, and the one before that a thousand years earlier. These 
eruptions, as well as their more recent predecessors, took place 
from new vents chiefly on its eastern and northeastern flanks. 
All of them began suddenly, were accompanied by violent earth- 
quakes, and were preceded by long intervals of repose. 
Such an interval, one of more than four centuries, followed 
the last eruption, and during that time there were no earthquakes 
Scale of Miles 
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Casamicciola 
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Ischia 
Fic. 6.—Map of Ischian earthquakes 
of any consequence in the island. Then, during one night— 
July 28-20, 1762—as many as 62 earthquakes were felt at Casa- 
micciola, some of them strong enough to damage buildings. On 
March 18, 1796, a severe earthquake occurred, which caused 
destruction of buildings in Casamicciola alone; on February 2, 
1828, one still stronger, which again wrought destruction in that 
town; others of less consequence, ‘but still strong, occurred on 
March 6, 1841, and August 15-16, 1867; the last of all being the 
destructive earthquakes of March 4, 1881, and July 28, 1883. 
In the accompanying map (Fig. 6) the dotted lines represent 
the boundaries of those portions of the central crater of Epomeo 
