Reservoirs and earthquakes

In 1982 the U.S. Army Corps of Engineers published a study of reservoir-induced seismicity. The study evaluated the evidence of induced earthquakes from eight cases including Koyna, Hoover, Nurek, and Kariba. In this paper, the methods used in the 1982 study are applied to more recent data from Koyna and Aswan. The data from Aswan do not support classification of the 1981 earthquake as reservoir-induced. The data from Koyna confirm the findings of the 1982 study that the earthquakes at Koyna are not closely correlated to the reservoir operation.     

Wavelike movement of bedload sediment,East Fork River,Wyoming

Bedload is moved down the East Fork River in distinct wavelike pulses that have the form of composite dune fields The moving material consists mostly of coarse sand and fine gravel The wavelengths of the pulses are about 500–600 m, a distance that is predetermined by the pattern of stoage of bed sediment in the river during low water As the river discharge increases, the bed sediment is scoured from the storage areas, and it is moved onto and across the interventing riffles As the river discharge decreases, the bed sediment is scoured off the riffles and moved into the next storage area downstream Each successive pulse of water discharge sets into motion a wave of bedload that continues to move unitil it reaches the next storage area