CISRG Discussions

(Reservoir Induced Seismicity)

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Resurgence of Reservoir Induced Seismicity.

Dr.Thomas Vladut, P.Eng.

Reservoir Induced Seismicity (RIS) is an undesirable and mostly unexpected environmental nuisance associated with the operations of some. The RIS term is associated with the fast impoundment of surface water reservoirs and filling of new water storage.

As dynamic changes of field stress conditions occur, other type of reservoirs, oil and gas, and mining may be associated to triggering induced seismicity (detailed in vol.1*).

RIS occurrence was associated with about 120 reservoirs at the recent International Symposium on RIS, held in Beijing China (November 1995). Some recent developments were affected by induced seismic events, ie:

RIS interferences were reported in 1996 associated with the impoundment of Katse Dam in Lesotho Africa. Even predicted using a simplistic RPM (Reservoir Prediction Method, Q60 R40 & Water Power May 1993) the Mapeleng tremor caused damages to about 52 dwellings and resettlement associated to RIS is first time to be implemented, both on voluntary and involuntary basis for mitigation of seismic concerns.

A strong earthquake (6.1 on Richter scale) focused attention on the seismic risks of large dams in the area of the Narmada Valley-India. The event located close (20-40 Km) from a dam impounded in 1990 (Bargi Dam) was associated with damages in the city of Jabalpur (1997 May 22-injuring 1000 and killing about 50 people). The event (1997 May 22) might be of long term RIS, similar to Aswan Dam affected after 17 years post impoundment, Cajuru in Brazil after 18 years, and other reservoirs.

To help the mitigation of environmental risks of RIS, considerations were made to ensemble the publications associated with the applications of the RPM method.

Vol I: At this time, the papers published before 1984, related to RIS before confirmation of predicted behavior are available in the format of a report that was widely distributed: "Evaluation of Man-Made Seismicity Induced by Engineering Developments* in Alberta" (200 pages and includes past papers published at several technical conferences: Montreal 1982, Sherbrooke 1980 and St.Luis, Missouri, 1981). The report got the citation for most distributed environmental Alberta's publication.

Vol II: Publications since 1984 will be consolidated in a second volume: "Publications on RIS 1994-1997" estimated to similar size and cost. The second volume will include papers from ISORIS'95, and review of the symposium, published in the International Journal on Hydropower & Dams, November 1996, and the manuscript of review of RIS papers at ICOLD 1997 19th Congress, and all other related publications: World Bank 1989, NATO's 1995 Moscow, etc.

Vol III & IV,: The short course on RIS presented at First International Conference of Environmental Technology [USA-Allentown- University of Leheight] Vol IV- Beijing ISORIS'95 [proceedings-copy]

Four volumes $ 500, or single volume for $ 200 each.

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