Time-dependence of the stress shadowing effect and its relation to the structure of the lower crust

Abstract

Research Article| February 01, 1999 Time-dependence of the stress shadowing effect and its relation to the structure of the lower crust Shelley Kenner; Shelley Kenner 1Department of Geophysics, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar Paul Segall Paul Segall 1Department of Geophysics, Stanford University, Stanford, California 94305, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Shelley Kenner 1Department of Geophysics, Stanford University, Stanford, California 94305, USA Paul Segall 1Department of Geophysics, Stanford University, Stanford, California 94305, USA Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (2): 119–122. https://doi.org/10.1130/0091-7613(1999)027<0119:TDOTSS>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Shelley Kenner, Paul Segall; Time-dependence of the stress shadowing effect and its relation to the structure of the lower crust. Geology 1999;; 27 (2): 119–122. doi: https://doi.org/10.1130/0091-7613(1999)027<0119:TDOTSS>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Great earthquakes, like the 1906 San Francisco earthquake, perturb the regional stress field and can generate "stress shadows" that delay the occurrence of subsequent M ≥ 5.5 events. We investigate how time-dependent postseismic stress transfer between the three subparallel strike-slip faults in northern California—the San Andreas, Hayward, and Calaveras faults, and their northern extensions—depends on the presence and geometry of lower crustal shear zones. Models incorporating Maxwell viscoelastic relaxation of the mantle, a lower crustal detachment surface, and vertical shear zones beneath the seismogenic faults are compared. Short-term relaxation of lower crustal shear zones enhances the amplitude and lateral extent of the stress shadow. Conversely, longer period mantle relaxation reloads the entire crust. As a consequence, after a 1906 type event on the San Andreas fault, the stress shadow on the Hayward fault will be greater in magnitude and duration if the faults are connected via lower crustal structures with time-dependent rheologies. In addition, our results demonstrate that, for certain geometries, the total stress (tectonic plus postseismic perturbation) may actually continue to decrease during the decades immediately following a great earthquake. This effect has not been documented in prior time-dependent models of stress accumulation during the earthquake cycle. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.