A
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42˚N
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40˚N
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◆
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◆
◆
◆
◆
38˚N
◆
◆
◆
◆
◆ ◆
◆
◆
40˚N
◆
◆
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36˚N
70˚W
◆
◆
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68˚W
66˚W
64˚W
62˚W
60˚W
30˚N
70˚W
60˚W
70˚W
60˚W
50˚W
50˚W
B
C
40˚N
30˚N
40˚N
30˚N
30˚N
50˚W
70˚W
40˚N
60˚W
40˚N
70˚W
60˚W
30˚N
50˚W
Figure 3. (A) Geometry of the proposed 18-OBS
array. Solid diamonds show provisional OBS
locations, inverted triangles show existing permanent
seismic observatories on land. (B) Typical
distribution of global seismicity relative to the
proposed array (open box). Circles show
earthquakes with M>6 during 1997-98. Ray
distribution for these earthquakes is shown in C (top
panel). Crosses show earthquakes with M>5 within
40° from the center of the proposed array. Ray
distribution for these earthquakes is shown in C
(lower panel). An open circle on ray diagrams
denotes Bermuda.
58˚W