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Seismicity in the Challis, Idaho, Region, January 2014–May 2017: Late Aftershocks of the 1983 Ms 7.3 Borah Peak Earthquake

2018; Seismological Society of America; Volume: 89; Issue: 4 Linguagem: Inglês

10.1785/0220180058

1938-2057

Guanning Pang, Keith D. Koper, Michael C. Stickney, James C. Pechmann, Relu Burlacu, K. L. Pankow, S. J. Payne, H. Benz,

High-pressure geophysics and materials

Research Article| May 09, 2018 Seismicity in the Challis, Idaho, Region, January 2014–May 2017: Late Aftershocks of the 1983 Ms 7.3 Borah Peak Earthquake Guanning Pang; Guanning Pang aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Search for other works by this author on: GSW Google Scholar Keith D. Koper; Keith D. Koper aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Search for other works by this author on: GSW Google Scholar Michael C. Stickney; Michael C. Stickney bMontana Bureau of Mines and Geology, 1300 West Park Street, Butte, Montana 59701 U.S.A. Search for other works by this author on: GSW Google Scholar James C. Pechmann; James C. Pechmann aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Search for other works by this author on: GSW Google Scholar Relu Burlacu; Relu Burlacu aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Search for other works by this author on: GSW Google Scholar Kristine L. Pankow; Kristine L. Pankow aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Search for other works by this author on: GSW Google Scholar Suzette Payne; Suzette Payne cIdaho National Laboratory, P.O. Box 1625, MS 2203, Idaho Falls, Idaho 83415 U.S.A. Search for other works by this author on: GSW Google Scholar Harley M. Benz Harley M. Benz dNational Earthquake Information Center, U.S. Geological Survey, Denver Federal Center, Box 25046, MS 966, Denver, Colorado 80225 U.S.A. Search for other works by this author on: GSW Google Scholar Author and Article Information Guanning Pang aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Keith D. Koper aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Michael C. Stickney bMontana Bureau of Mines and Geology, 1300 West Park Street, Butte, Montana 59701 U.S.A. James C. Pechmann aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Relu Burlacu aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Kristine L. Pankow aDepartment of Geology and Geophysics, University of Utah, 115 South 1460 East, Room 383 FASB, Salt Lake City, Utah 84112‐0102 U.S.A., g.Pang@utah.edu Suzette Payne cIdaho National Laboratory, P.O. Box 1625, MS 2203, Idaho Falls, Idaho 83415 U.S.A. Harley M. Benz dNational Earthquake Information Center, U.S. Geological Survey, Denver Federal Center, Box 25046, MS 966, Denver, Colorado 80225 U.S.A. Publisher: Seismological Society of America First Online: 09 May 2018 Online Issn: 1938-2057 Print Issn: 0895-0695 © Seismological Society of America Seismological Research Letters (2018) 89 (4): 1366–1378. https://doi.org/10.1785/0220180058 Article history First Online: 09 May 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Guanning Pang, Keith D. Koper, Michael C. Stickney, James C. Pechmann, Relu Burlacu, Kristine L. Pankow, Suzette Payne, Harley M. Benz; Seismicity in the Challis, Idaho, Region, January 2014–May 2017: Late Aftershocks of the 1983 Ms 7.3 Borah Peak Earthquake. Seismological Research Letters 2018;; 89 (4): 1366–1378. doi: https://doi.org/10.1785/0220180058 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 SocietySeismological Research Letters Search Advanced Search Abstract In April 2014, after about 20 yrs of relatively low seismicity, an energetic earthquake sequence (maximum ML 4.8) began 25–30 km northwest of the 1983 Ms 7.3 Borah Peak earthquake rupture area near the town of Challis, Idaho. This sequence ended in the fall of 2014, but in January 2015, a second energetic sequence (maximum ML 5.0) began about 20 km to the southeast. Modest seismicity has continued in both regions with ∼1000 earthquakes detected and located through May 2017. To better characterize the seismicity in the area, we deployed a seven‐station local seismometer network during April–October 2014; one of the stations remained active until July 2015. Here, we report updated locations for earthquakes in the Challis area for 1 January 2014–31 May 2017. Using a combination of absolute and differential arrival times, we generated a catalog of high‐accuracy relocations. The earthquakes clustered into four primary groups, three of them with strikes similar to the Lost River fault—the fault responsible for the 1983 Borah Peak event. We used a modified cut‐and‐paste method to determine moment tensors for 15 of the largest events. All of the moment tensors showed normal faulting with nodal plane strikes consistent with the trend of the relocated seismicity and the regional stress field. We suggest that the recent seismicity near Challis is best interpreted as a continuation of the 1983 Ms 7.3 Borah Peak aftershock sequence, which is unusually long compared to plate boundary aftershock sequences because of the lower regional strain rate. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.