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. |
Concrete elevated water tank, empty at the time of the earthquake, shows only tension cracks at the base of its shaft. Elevated water tanks sway like inverted pendulums during earthquake shaking. When the tanks are filled with sloshing water, the shafts supporting the tanks generally fails. In general, such elevated concrete water tanks sustained damage in this earthquake. 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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