Aftershock Patterns of Ms>7 Earthquakes in the India-Asia Collision Belt: Anomalous Results from the Muzaffarabad Earthquake Sequence, Kashmir, 2005

Research Article| December 31, 2013 Aftershock Patterns of Ms>7 Earthquakes in the India–Asia Collision Belt: Anomalous Results from the Muzaffarabad Earthquake Sequence, Kashmir, 2005 Mohammad Tahir; Mohammad Tahir Institut des Sciences de la Terre (ISTerre), University Joseph Fourier—Grenoble I, Maison des Géosciences, 1381 rue de la Piscine, 38041 Grenoble, Francejrgrasso@me.commtyousafzai@gmail.com Search for other works by this author on: GSW Google Scholar Jean Robert Grasso Jean Robert Grasso Institut des Sciences de la Terre (ISTerre), University Joseph Fourier—Grenoble I, Maison des Géosciences, 1381 rue de la Piscine, 38041 Grenoble, Francejrgrasso@me.commtyousafzai@gmail.com Search for other works by this author on: GSW Google Scholar Author and Article Information Mohammad Tahir Institut des Sciences de la Terre (ISTerre), University Joseph Fourier—Grenoble I, Maison des Géosciences, 1381 rue de la Piscine, 38041 Grenoble, Francejrgrasso@me.commtyousafzai@gmail.com Jean Robert Grasso Institut des Sciences de la Terre (ISTerre), University Joseph Fourier—Grenoble I, Maison des Géosciences, 1381 rue de la Piscine, 38041 Grenoble, Francejrgrasso@me.commtyousafzai@gmail.com Publisher: Seismological Society of America First Online: 14 Jul 2017 Online ISSN: 1943-3573 Print ISSN: 0037-1106 Bulletin of the Seismological Society of America (2014) 104 (1): 1–23. https://doi.org/10.1785/0120120158 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Mohammad Tahir, Jean Robert Grasso; Aftershock Patterns of Ms>7 Earthquakes in the India–Asia Collision Belt: Anomalous Results from the Muzaffarabad Earthquake Sequence, Kashmir, 2005. Bulletin of the Seismological Society of America 2013;; 104 (1): 1–23. doi: https://doi.org/10.1785/0120120158 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 The seismicity rate triggered by the Muzaffarabad, Kashmir, 2005 Mw 7.6, Ms 7.7 earthquake is above the average when analyzing the aftershock rate of the 18 Ms≥7.0 events in the India–Asia collision belt between 1973 and 2008. All 17 Ms≥7.0 events occurred within 10° latitude and 20° longitude distance from the 2005 Muzaffarabad earthquake epicenter. We determined the huge aftershock productivity for this earthquake is not driven by a specific Omori law parameter. This anomaly in aftershock rate value corresponds to a relatively higher rate decay (as measured by the p‐value), and a larger density value in a higher background seismicity rate setting (prestress conditions) than the other 17 sequences, respectively. After normalizing by the mainshock size and by the magnitude range of observation, we resolved the anomalies, with a 95% confidence level for five aftershock sequences, for either the duration, the productivity, the density, or the background seismicity rate. When we did not include the local processes that drive these specific anomalies, two other global results emerged for the averaged data from the 18 Ms>7.0 aftershock sequences. First, for all sequences, background seismicity and duration are anticorrelated (⁠⁠). Within the framework of rate‐and‐state friction law, this result supports the assertion that the observed background seismicity rate can be used as a proxy for the stressing rate (Dieterich, 1994). Second, we robustly resolve the dependence of aftershock productivity on the mainshock faulting styles; for example, the aftershock productivity for strike‐slip mainshocks is on average four times smaller than the productivity of thrust faulting mainshocks. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.