Research Article
Influence of the Three Gorges Reservoir Impoundment on Xiannvshan Fault Activity
Table 1
Changes of earthquake frequency during impoundment period.
| | Impoundment period | Earthquake frequency | | 0-0.9 | 1.0-1.9 | 2.0-2.9 | >3 |
| | Before impoundment (2000.01.01-2003.05.01) | 83 | 51 | 6 | 1 | | During 135 m impoundment (2003.06.01-2006.09.20) | 915 | 144 | 16 | 1 | | During 156 m impoundment (2006.09.20-2008.09.27) | 1868 | 280 | 20 | 1 | | 175 m experimental impoundment stage (2008.09.27-2009.12.31) | 1446 | 232 | 33 | 1 |
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