Copyright Information: All images are in the public domain and available for free. If you use this image, credit NOAA/NGDC, M. Mehrain, Dames and Moore. |
Relatively undamaged Sefid Rud Dam located within one km of the fault. The buttress dam has a height of 106 m, a length of 425 m, and a base width of 100 m. The dam was reportedly designed for a static lateral force coefficient of 0.25. The reservoir was almost full at the time of the earthquake and experienced very intense ground motion (0.60g). Horizontal and diagonal cracks occurred at the top of some buttresses, but the dam remained stable. However, a massive rockfall near the dam caused the collapse of the guard house and the death of the guard. Image Credit: M. Mehrain. Dames and Moore June 20, 1990 Northern Iran earthquake A magnitude 7.7 earthquake occurred in the Gilan Province between the towns of Rudbar and Manjil in northern Iran on Thursday, June 21, 1990 (June 20 at 21:00 GMT). The event, the largest ever to be recorded in that part of the Caspian Sea region, may have been composed of two or more closely-spaced earthquakes occurring in rapid succession. These quakes, exceptionally close to the surface for this region, were also unusually destructive. Event Data:
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