−70
Scotia plate
South
American
plate
Eurasian plate
African
plate
Indian
plate
Australian
plate
Philippine
plate
Pacific plate
Juan
de Fuca
plate
North
American
plate
Caribbean
plate
Nazca
plate
Cocos
plate
Antarctic plate
−60
−50
−40
−30
−20
−10
0
10
20
30
40
50
60
70
0
30
60
90
120
150
180
210
240
270
300
330
360
70
60
0
50
40
30
20
10
−10
−20
−30
−40
−50
−60
−70
Eurasian plate
African
plate
Indian
plate
Australian
plate
Philippine
plate
Pacific plate
Juan
de Fuca
plate
North
American
plate
Caribbean
plate
Nazca
plate
Cocos
plate
South
American
plate
Antarctic plate
Scotia plate
0
30
60
90
120
150
180
210
240
270
300
330
360
Fig. 5.1-4 Global seismicity (1964–97). Top: Earthquakes (m b ≥ 5, all depths) clearly delineate most plate boundaries, and show that some (e.g., IndiaEurasia) are diffuse. Many intraplate earthquakes show internal plate deformation. Bottom: The locations of seismicity (of all magnitudes) below 100 km
indicate the subduction zones.
Introduction 289