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- W2768432829 abstract "Research Article| September 25, 2017 Holocene Earthquakes of Magnitude 7 during Westward Escape of the Olympic Mountains, Washington Alan R. Nelson; Alan R. Nelson aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov Search for other works by this author on: GSW Google Scholar Stephen F. Personius; Stephen F. Personius aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov Search for other works by this author on: GSW Google Scholar Ray E. Wells; Ray E. Wells bGeology, Minerals, Energy, and Geophysics Science Center, Oregon Water Science Center, U.S. Geological Survey, 2130 SW 5th Avenue, Portland, Oregon 97201‐4976 Search for other works by this author on: GSW Google Scholar Elizabeth R. Schermer; Elizabeth R. Schermer cWestern Washington University, Geology Department ES‐240, MS 9080, 516 High Street, Bellingham, Washington 98225 Search for other works by this author on: GSW Google Scholar Lee‐Ann Bradley; Lee‐Ann Bradley aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov Search for other works by this author on: GSW Google Scholar Jason Buck; Jason Buck dSHN Consulting Engineers & Geologists, Inc., 812 W Wabash Avenue, Eureka, California 95501 Search for other works by this author on: GSW Google Scholar Nadine Reitman Nadine Reitman aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov Search for other works by this author on: GSW Google Scholar Author and Article Information Alan R. Nelson aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov Stephen F. Personius aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov Ray E. Wells bGeology, Minerals, Energy, and Geophysics Science Center, Oregon Water Science Center, U.S. Geological Survey, 2130 SW 5th Avenue, Portland, Oregon 97201‐4976 Elizabeth R. Schermer cWestern Washington University, Geology Department ES‐240, MS 9080, 516 High Street, Bellingham, Washington 98225 Lee‐Ann Bradley aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov Jason Buck dSHN Consulting Engineers & Geologists, Inc., 812 W Wabash Avenue, Eureka, California 95501 Nadine Reitman aGeologic Hazards Science Center, U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401, anelson@usgs.gov 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): 2394–2415. https://doi.org/10.1785/0120160323 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 Alan R. Nelson, Stephen F. Personius, Ray E. Wells, Elizabeth R. Schermer, Lee‐Ann Bradley, Jason Buck, Nadine Reitman; Holocene Earthquakes of Magnitude 7 during Westward Escape of the Olympic Mountains, Washington. Bulletin of the Seismological Society of America 2017;; 107 (5): 2394–2415. doi: https://doi.org/10.1785/0120160323 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 Lake Creek–Boundary Creek fault, previously mapped in Miocene bedrock as an oblique thrust on the north flank of the Olympic Mountains, poses a significant earthquake hazard. Mapping using 2015 light detection and ranging (lidar) confirms 2004 lidar mapping of postglacial (<13 ka) and Holocene fault scarps along the 22‐km‐long eastern section of the fault and documents Holocene scarps that extend ≥14 km along a splay fault, the Sadie Creek fault, west of Lake Crescent. Scarp morphology suggests repeated earthquake ruptures along the eastern section of the Lake Creek–Boundary Creek fault and the Sadie Creek fault since ∼13 ka. Right‐lateral (∼11–28 m) and vertical (1–2 m) cumulative fault offsets suggest slip rates of ∼1–2 mm/yr. Stratigraphic and age‐model data from five trenches perpendicular to scarps at four sites on the eastern section of the fault show evidence of 3–5 surface‐rupturing earthquakes. Near‐vertical fault dips and upward‐branching fault patterns in trenches, abrupt changes in the thickness of stratigraphic units across faults, and variations in vertical displacement of successive stratigraphic units along fault traces also suggest a large lateral component of slip. Age models suggest two earthquakes date from 1.3±0.8 and 2.9±0.6 ka; evidence and ages for 2–3 earlier earthquakes are less certain. Assuming 3–5 postglacial earthquakes, lateral and vertical cumulative fault offsets yield average slip per earthquake of ∼4.6 m, a lateral‐to‐vertical slip ratio of ∼10:1, and a recurrence interval of 3.5±1.0 ka. Empirical relations yield moment magnitude estimates of M 7.2–7.5 (slip per earthquake) and 7.1–7.3 (56 km maximum rupture length). An apparent left‐lateral Miocene to right‐lateral Holocene slip reversal on the faults is probably related to overprinting of east‐directed, accretion‐dominated deformation in the eastern core of the Olympic Mountains by north‐directed, margin‐parallel shortening and westward escape of the mountains. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2768432829 title "Holocene Earthquakes of Magnitude 7 during Westward Escape of the Olympic Mountains, Washington" @default.
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