β Scribed by O.V. Soboleva; U.A. Mamadaliev
No coin nor oath required. For personal study only.
The Nurek Reservoir is located in an area of high seismicity. An average of 5--6 earthquakes of (Russian energy class) K = 10 and 1--2 earthquakes of K = 11 per year occurred in the vicinity of the reservoir. The largest local earthquake recorded fell in the energy class K = 14 (1956).
At the end of 1972, after the water level had risen to 100 m, earthquake activity increased sharply. Three events of K = 12 were recorded during one month and the total number of earthquakes (K >/7) exceeded three times the former mean level of seismicity.
Spatial and temporal properties in the epicentral distribution showed a migration from the southwest toward the reservoir.
Earthquake mechanisms of 215 events of K/> 9 since 1960 were analysed. Fault plane solutions for some of the earthquakes which occurred after the impoundment were found to be different from the ordinary ones.
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