Period

No of earthquakes

Earthquake Frequency

(Years between earthquakes)

Earthquakes per year

Hearing disabilities

(% population)

a) 1981-1996

15 years

4

3.75

0.27

5.6

b) 1997-2005

9 years

8

1.1

0.89

20.5

Ratio (B/A)

3.3

3.7