Question: What was the background seismicity in the region before the M9.0 earthquake?  

 Answer: This table represents the number of earthquakes in the aftershock zone of the magnitude 9.0 earthquake on 12/26/04 for the ten previous years.

The numbers of earthquakes located in 2004 does NOT reflect the main shock or aftershocks from the 9.0. The region encompasses a rectangular box which extends from 2N to 14N and from 92E to 98E. These statistics were obtained from the USGS PDE earthquake catalog search page.

YEAR

Magnitude 5.5 & larger events.

Magnitude 5.0 & larger events.

Magnitude 4.5 & larger events.

1995

2

7

35

1996

2

9

36

1997

2

11

37

1998

1

8

38

1999

3

11

34

2000

5

12

44

2001

4

9

36

2002

11

25

91

2003

6

20

64

2004

4

14

67

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