No correlation between Anderson Reservoir stage level and underlying Calaveras fault seismicity despite calculated differential stress increases

Lithosphere
By:

Links

Abstract

Concerns have been raised that stresses from reservoir impoundment may trigger damaging earthquakes because rate changes have been associated with reservoir impoundment or stage-level changes globally. Here, the idea is tested blindly using Anderson Reservoir, which lies atop the seismically active Calaveras fault. The only knowledge held by the author going into the study was the expectation that reservoir levels change cyclically because of seasonal rainfall. Examination of seismicity rates near the reservoir reveals variability, but no correlation with stage-level changes. Three-dimensional fi nite-element modeling shows stress changes suffi cient for earthquake triggering along the Calaveras fault zone. Since many of the reported cases of induced triggering come from low-strain settings, it is speculated that gradual stressing from stage-level changes in high-strain settings may not be signifi cant. From this study, it can be concluded that reservoirs are not necessarily risky in active tectonic settings. ?? 2011 Geological Society of America.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title No correlation between Anderson Reservoir stage level and underlying Calaveras fault seismicity despite calculated differential stress increases
Series title Lithosphere
DOI 10.1130/L148.1
Volume 3
Issue 4
Year Published 2011
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Lithosphere
First page 261
Last page 264
Google Analytic Metrics Metrics page
Additional metadata about this publication, not found in other parts of the page is in this table