Seismo-Watch Archive of
Large Moment Magnitude (Mw) Earthquakes

April 1991
Total Number of Mw >6.0 Earthquakes per Month = 15
Cumulative Number of Mw >6.0 Earthquakes per Year = 42

Total Number of Mw >7.0 Earthquakes per Month = 3
Cumulative Number of Mw >7.0 Earthquakes per Year = 5

Date

Time

Lat

Lon

Depth

Mw
Loction**
Apr 1

0353

15.74N

095.73E

150

6.0*
Apr 4

0322

07.01N

078.15W

329

6.3
Apr 4

1523

06.03S

077.13W

207

6.5
Apr 5

0419

05.98S

077.09W

198

7.1
Apr 5

1550

14.23S

075.51W

500

6.3
Apr 6

1434

15.00S

175.52W

160

6.7
Apr 14

0808

27.15N

127.41E

830

6.3
Apr 18

0941

22.92S

179.34W

470

6.0
Apr 19

1125

14.88S

174.95W

195

6.1
Apr 22

2156

09.68N

083.07W

100

7.6*
Apr 24

0457

09.04N

126.73E

138

6.3*
Apr 24

1913

09.74N

083.51W

127

6.2
Apr 29

0912

42.45N

043.67E

172

7.0*
Apr 29

1830

42.50N

043.89E

143

6.1*
Apr 30

2016

05.92N

082.61W

100

6.0*
Source: U.S. Geological Survey, National Earthquake Information Center; Harvard Geophysical Observatory, Harvard University (magnitudes with " * " are HRV). ("**" = Physical locations are not available from these cataloges and will have to be hand entered at a future date.

Disclaimer and Limitations
All data are preliminary and subject to change. Much of the information, including time, date, location, depth and magnitude, are determined by automatic processing. Future analysis may develop changes in these data. This data may not be reproduced, in part or in full, or by any form, including re-fax or re-mail transmissions, without prior written authorization from Advanced Geologic Exploration.

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