Tag: RIS

Evidence for surface loading as trigger mechanism of the 2008 Wenchuan earthquake

(July 14, 2010) Abstract: Two and a half years prior to China’s M7.9 Wenchuan earthquake of May 2008, at least 300 million metric tons of water accumulated with additional seasonal water level changes in the Minjiang River Valley at the eastern margin of the Longmen Shan. This article shows that static surface loading in the valley induced Coulomb failure stresses on the nearby Beichuan thrust fault system at <17km depth.

The Zipingpu experiment: Dam engineers go back to the drawing boards

(April 20, 2010) Until the deadly Wenchuan earthquake in China in 2008, no large concrete face rockfill dam (CFRD) had ever been subject to a strong, ground shaking earthquake. But that changed on May 12, 2008 when the Zipingpu hydro dam, one of the largest CFRDs in China and sitting just 17 km from the earthquake epicenter, suffered higher than anticipated seismic forces, causing major damage to its concrete face and deflecting the giant structure 180 mm downstream. A leading scientist now says the earthquake should act as a wake up call for dam builders.

Prediction of reservoir-induced earthquake based on fuzzy theory

(April 4, 2010) Abstract—With more and more reservoirs have been and are being built all over the world, reservoir-induced earthquake has received a great deal of attention from geoscientists mainly because of its potential to damage constructions and to cause human losses. Based on the previous researches on the environmental conditions of reservoir-induced earthquake, a criteria hierarchy model has been constructed.

The Three Gorges reservoir has become a danger

(March 11, 2010) The large-scale construction that accompanied the building of the Three Gorges dam and its reservoir has increased the number of landslides—both new and reactivated—in the surrounding area. County seats recently built on land near the reservoir are now particularly prone to landslides. Local schools and residential buildings are already suffering cracked foundations and walls.

More evidence the Zipingpu dam may be to blame for the Wenchuan earthquake

(November 6, 2009) A recent article by scientists in the U.S. provides further evidence that the Zipingpu dam’s reservoir may have triggered the devastating May 2008 Wenchuan earthquake in China. The Wenchuan earthquake killed nearly 90,000 people and unleashed a chorus of speculation that the Zipingpu reservoir may have contributed to the severity of the earthquake, or helped to trigger it.

Reservoir-Triggered Seismicity in Armenian Large Dams

(Fall 2009) Reservoir-triggered seismicity (RTS) is a phenomenon, which has been observed in several large dam projects all over the world, especially for the reservoirs which are constructed in seismically active regions. Practically all the territory of the Republic of Armenia is characterized as the high seismic active area. A review of reservoir triggered seismicity in Armenia shows that it mainly occurs in large dams which are located near active faults. In this paper it has been shown that the number of microearthquakes increase after Tolors reservoir operation, cause changes of seismic regime in the observed regions.