Seismogram recorded at Buenos Aires, Argentina
2000
1000
0
19:15:00
19:16:00
19:17:00
Time (UTC)
19:18:00
Seismogram recorded at Santiago, Chile
8000
4000
19:13:00
19:14:00
19:15:00
Time (UTC)
Seismogram recorded at Comodoro Rivadavia, Argentina
4000
2000
19:13:00
19:14:00
19:15:00
Time (UTC)
19:16:00
Nomogram for Determining Earthquake Magnitude
10,000
5000
1000
6000
500
4000
9
200
8
100
2000
1500
50
1000
7
800
600
6
400
200
100
Distance, km
10
5
5
300
20
4
2
1
0.5
3
0.2
2
0.1
Magnitude
Amplitude, mm