Aftershock Sequence of the 2011 Virginia Earthquake Derived from the Dense AIDA Array and Backprojection
2019; Seismological Society of America; Volume: 109; Issue: 1 Linguagem: Inglês
10.1785/0120180107
ISSN1943-3573
AutoresGungor Beskardes, Qimin Wu, J. A. Hole, M. C. Chapman, K. K. Davenport, L. D. Brown, D. A. Quiros,
Tópico(s)Seismology and Earthquake Studies
ResumoResearch Article| January 02, 2019 Aftershock Sequence of the 2011 Virginia Earthquake Derived from the Dense AIDA Array and Backprojection G. D. Beskardes; G. D. Beskardes aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.comcNow at Geophysics Department, Sandia National Laboratories, 701 Stephen Moody Street, SE Apartment 1433, Albuquerque, New Mexico 87123. Search for other works by this author on: GSW Google Scholar Q. Wu; Q. Wu aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.comdNow at ConocoPhillips School of Geology and Geophysics, The University of Oklahoma, Sarkeys Energy Center, Suite 710, 100 E. Boyd Street, Norman, Oklahoma 73019. Search for other works by this author on: GSW Google Scholar J. A. Hole; J. A. Hole aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.com Search for other works by this author on: GSW Google Scholar M. C. Chapman; M. C. Chapman aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.com Search for other works by this author on: GSW Google Scholar K. K. Davenport; K. K. Davenport aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.comeNow at College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, Corvallis, Oregon 97331‐5503. Search for other works by this author on: GSW Google Scholar L. D. Brown; L. D. Brown bDepartment of Earth and Atmospheric Sciences, Cornell University, 3120 Snee Hall, Ithaca, New York 14853‐1504, ldb7@cornell.edu, daq7@cornell.edu Search for other works by this author on: GSW Google Scholar D. A. Quiros D. A. Quiros bDepartment of Earth and Atmospheric Sciences, Cornell University, 3120 Snee Hall, Ithaca, New York 14853‐1504, ldb7@cornell.edu, daq7@cornell.edufNow at Department of Geosciences, Baylor University, One Bear Place #97354, Waco, Texas 76798. Search for other works by this author on: GSW Google Scholar Author and Article Information G. D. Beskardes aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.comcNow at Geophysics Department, Sandia National Laboratories, 701 Stephen Moody Street, SE Apartment 1433, Albuquerque, New Mexico 87123. Q. Wu aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.comdNow at ConocoPhillips School of Geology and Geophysics, The University of Oklahoma, Sarkeys Energy Center, Suite 710, 100 E. Boyd Street, Norman, Oklahoma 73019. J. A. Hole aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.com M. C. Chapman aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.com K. K. Davenport aDepartment of Geosciences, Virginia Tech, 4044 Derring Hall, 926 West Campus Drive, Blacksburg, Virginia 24061, didem@vt.edu, wqimin86@vt.edu, hole.vt.edu, mcc@vt.edu, davenport.k42@gmail.comeNow at College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, 104 CEOAS Administration Building, Corvallis, Oregon 97331‐5503. L. D. Brown bDepartment of Earth and Atmospheric Sciences, Cornell University, 3120 Snee Hall, Ithaca, New York 14853‐1504, ldb7@cornell.edu, daq7@cornell.edu D. A. Quiros bDepartment of Earth and Atmospheric Sciences, Cornell University, 3120 Snee Hall, Ithaca, New York 14853‐1504, ldb7@cornell.edu, daq7@cornell.edufNow at Department of Geosciences, Baylor University, One Bear Place #97354, Waco, Texas 76798. Publisher: Seismological Society of America First Online: 02 Jan 2019 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2019) 109 (1): 19–33. https://doi.org/10.1785/0120180107 Article history First Online: 02 Jan 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation G. D. Beskardes, Q. Wu, J. A. Hole, M. C. Chapman, K. K. Davenport, L. D. Brown, D. A. Quiros; Aftershock Sequence of the 2011 Virginia Earthquake Derived from the Dense AIDA Array and Backprojection. Bulletin of the Seismological Society of America 2019;; 109 (1): 19–33. doi: https://doi.org/10.1785/0120180107 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 After the 2011 Mineral, Virginia, earthquake, a temporary dense array (aftershock imaging with dense arrays [AIDA]) consisting of ∼200 stations was deployed at 200–400 m spacing near the epicenter for 12 days. Backprojection of the data was used to automatically detect and locate aftershocks. The co‐deployment of a traditional aftershock network of 36 stations at ∼2–10 km spacing enables a quantitative comparison. The AIDA backprojection aftershock catalog is complete to M−0.5 and includes 1673 events. For comparison, the traditional network was complete to M−0.1 with 813 events within the same time period and spatial volume. Only 494 of the traditional network events were of sufficient quality to compute improved double‐difference locations, for a completeness of M+0.2. The AIDA backprojection catalog observes the same major patterns of seismicity in the epicentral region, but additional details are illuminated, and absolute uncertainty was reduced. The primary zone of seismicity is not a single fault but is a tabular zone of multiple small faults with no resolvable internal structures. This zone has a subtle concave shape along strike and with depth, and a broader zone of newly detected events is observed at shallow depth. In addition, a shallow cluster was detected and located to the east of the main aftershock zone. The addition of smaller events to the catalog did not change the b‐value but illuminated spatial and temporal patterns. The b‐value is different at less than about 3 km depth than at greater depth. Very low b‐value, especially at greater depth, is consistent with observed very high stress drops. The results indicate the benefits of dense arrays and autodetection by backprojection for aftershock studies. The reduced detection threshold and higher spatial resolution enabled the study of earthquake mechanisms and strain transfer at a smaller scale. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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