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New Constraints on the Mechanism and Rupture Area for the 1905 Mw 7.8 Kangra Earthquake, Northwest Himalaya

2017; Seismological Society of America; Volume: 107; Issue: 5 Linguagem: Inglês

10.1785/0120160267

1943-3573

Walter Szeliga, Roger Bilham,

Geological and Geochemical Analysis

Research Article| September 25, 2017 New Constraints on the Mechanism and Rupture Area for the 1905 Mw 7.8 Kangra Earthquake, Northwest Himalaya Walter Szeliga; Walter Szeliga aDepartment of Geological Sciences, Central Washington University, 400 East, University Way, Ellensburg, Washington 98926, walter@geology.cwu.edu Search for other works by this author on: GSW Google Scholar Roger Bilham Roger Bilham bDepartment of Geological Sciences, University of Colorado, Boulder, UCB 39, Boulder, Colorado 80309‐0399 Search for other works by this author on: GSW Google Scholar Author and Article Information Walter Szeliga aDepartment of Geological Sciences, Central Washington University, 400 East, University Way, Ellensburg, Washington 98926, walter@geology.cwu.edu Roger Bilham bDepartment of Geological Sciences, University of Colorado, Boulder, UCB 39, Boulder, Colorado 80309‐0399 Publisher: Seismological Society of America First Online: 27 Sep 2017 Online Issn: 1943-3573 Print Issn: 0037-1106 Bulletin of the Seismological Society of America (2017) 107 (5): 2467–2479. https://doi.org/10.1785/0120160267 Article history First Online: 27 Sep 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Walter Szeliga, Roger Bilham; New Constraints on the Mechanism and Rupture Area for the 1905 Mw 7.8 Kangra Earthquake, Northwest Himalaya. Bulletin of the Seismological Society of America 2017;; 107 (5): 2467–2479. doi: https://doi.org/10.1785/0120160267 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 SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Previous interpretations of the 4 April 1905 Mw 7.8±0.2 Kangra earthquake assumed pure thrust slip on a gently dipping plane with dimensions on the order of 55 km down‐dip and 100–150 km along strike. However, the identification of recent surface slip on a 60‐km‐long strike‐slip fault, the Kangra Valley fault (KVF), above the northwestern corner of the inferred thrust, raises the intriguing possibility that moment release in 1905 may have been partly, or wholly attributable to dextral slip. We use geodetic strain data to constrain maximum dextral slip on the mapped fault trace of the KVF to less than 0.6 m, equivalent to an Mw≤6.8 earthquake, but find that 1.1±0.25 m of subsurface reverse slip occurred along ≈190 km of the mapped Jawalmukhi thrust fault. Reevaluated macroseismic data for the 1905 earthquake and insights from the distribution of felt intensities above the 2015 Gorkha earthquake, however, suggest that the Kangra coseismic rupture extended only ≈100 km along strike. In the time period following the 1905 earthquake, afterslip to the southeast of the mainshock either preceded or accompanied a large aftershock sequence (⁠6.4<Mw<6.8⁠) located near the down‐dip end of this extended slip zone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.