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

September 1991
Total Number of Mw >6.0 Earthquakes per Month = 7
Cumulative Number of Mw >6.0 Earthquakes per Year = 87

Total Number of Mw >7.0 Earthquakes per Month = 1
Cumulative Number of Mw >7.0 Earthquakes per Year = 13

Date

Time

Lat

Lon

Depth

Mw
Loction**
Sep 3

0844

33.64N

138.77E

272

6.4
Sep 3

0905

17.91S

116.00W

85

6.4
Sep 3

1156

17.92S

115.99W

107

6.3
Sep 18

0948

14.64N

090.98W

50

6.2
Sep 21

1519

16.23S

173.00W

170

6.1
Sep 28

2026

05.81S

150.95E

280

6.6
Sep 30

0021

20.87S

178.59W

566

7.0*
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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