Why are earthquakes more numerous north of the trench axis?

Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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Why are earthquakes more numerous north of the trench axis?

ALEUTLAN IREN CH
Bering Canyos
Umnak Conak Im nal
168
RUSSIA
UNITED STATES
56
NORTH AMERICA PLATE
Bering Sea
75
ALEU†LAN IREN c H
PACIFIC O CEAN
PACIFIC PLATE
68
73
oris Canyon
A
Umpak
Prateau
Canyon
Lidson Bánk
1946
UnglaskaJ
Islands of
Four Mountoins
j00
Yunaska k.
Basin
aska Basin
uam
50
trench
EUTIA
trench axis
A
Rude Kno
1929
100
200
300
400
В
500 kilometers
FIGURE 11.7
Maps of the Aleutian Trench and northern Pacific Ocean basin.
A. Regional map.
B. Detailed tectonic map of the central portion of the Aleutian Trench. The rectangular box bisected by
line A-A' corresponds to the rectangular box in the lower middle portion of the regional map. A-A'
corresponds to the cross section shown in figure I1.8. Scale bar applies to map
В.
a Canyon
Transcribed Image Text:ALEUTLAN IREN CH Bering Canyos Umnak Conak Im nal 168 RUSSIA UNITED STATES 56 NORTH AMERICA PLATE Bering Sea 75 ALEU†LAN IREN c H PACIFIC O CEAN PACIFIC PLATE 68 73 oris Canyon A Umpak Prateau Canyon Lidson Bánk 1946 UnglaskaJ Islands of Four Mountoins j00 Yunaska k. Basin aska Basin uam 50 trench EUTIA trench axis A Rude Kno 1929 100 200 300 400 В 500 kilometers FIGURE 11.7 Maps of the Aleutian Trench and northern Pacific Ocean basin. A. Regional map. B. Detailed tectonic map of the central portion of the Aleutian Trench. The rectangular box bisected by line A-A' corresponds to the rectangular box in the lower middle portion of the regional map. A-A' corresponds to the cross section shown in figure I1.8. Scale bar applies to map В. a Canyon
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