55˚N
50˚N
45˚N
A
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▼
▼ ◆
◆
▼
▼
◆ ◆
▼ ◆ ◆
◆
◆
◆ ◆ ◆
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40˚N
35˚N
30˚N
a
100˚W
Bermud
95˚W
90˚W
85˚W
80˚W
65˚W
70˚W
75˚W
regional seismisity in 1997-98
B
C
♦
30˚N
diamond - 6>Mb>5 "regional"
cross - Mb>4 "local"
Mb>6.0
Teleseismic seismisity in 1997-98
90˚W
60˚W
30˚W
Figure 2. (top) Schematic map of the proposed array. White symbols show existing seismic installations
(star - available through IRIS DMC, box - CNSN, triangle - regional networks, including Lamont Cooperative
Seismic Network and some nodes of the POLARIS array in Canada). Filled diamonds indicate tentative
locations of OBSs, filled triangles show tentative locations of PASSCAL portable observatories along the
coast. (bottom left) Global seismicity with Mb>6.0 during a two-year period 91997-98. Study area is
denoted by a filled diamond. (bottom right) Regional and local seismicity during a two-year period (1997-98).
Outline of the proposed OBS deployment is shaded.