Record Details
On the evolution of seismogenic faults in the Longmen Shan, eastern Tibet
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | On the evolution of seismogenic faults in the Longmen Shan, eastern Tibet |
| Names |
Zhang, Huiping
(creator) Yi, Guixi (creator) Zhang, Peizhen (creator) Kirby, Eric (creator) |
| Date Issued | 2015-11-01 (iso8601) |
| Note | This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by Elsevier and can be found at: http://www.journals.elsevier.com/journal-of-asian-earth-sciences |
| Abstract | A fundamental debate exists regarding the geometry and depth extent of seismogenic faults in eastern Tibet. Along the Longmen Shan, geologic and seismic reflection data reveal a belt of low to moderate angle thrust faults, some of which may have been activated in devastating earthquakes in 2008 (Mw ~7.9, Wenchuan) and 2013 (Mw ~6.6, Lushan). However, geologic and geodetic constraints on these ruptures suggest rupture along relatively high-angle listric reverse faults. Here, we use a combination of focal mechanisms determined from 276 aftershocks (Ms>4.0) with well-determined lifeforms and aftershock distributions from the 2008 event to determine subsurface fault geometry. Our results imply that seismogenic slip occurred along relatively high-angle structures that cross-cut low-angle imbricate faults imaged in reflection seismic data. Thus, we suggest that current geometric models of seismogenic faults may not fully represent the distribution of subsurface seismic hazard along the heavily-populated Sichuan Basin. |
| Genre | Article |
| Topic | Longmen Shan |
| Identifier | Zhang, H., Yi, G., Zhang, P., & Kirby, E. (2015). On the evolution of seismogenic faults in the Longmen Shan, eastern Tibet. Journal of Asian Earth Sciences, 111, 624-631. doi:10.1016/j.jseaes.2015.05.014 |
