Holocene Rupture History of the Central Teton Fault at Leigh Lake, Grand Teton National Park, Wyoming

2019 ◽  
Vol 110 (1) ◽  
pp. 67-82 ◽  
Author(s):  
Mark S. Zellman ◽  
Christopher B. DuRoss ◽  
Glenn D. Thackray ◽  
Stephen F. Personius ◽  
Nadine G. Reitman ◽  
...  
Keyword(s):  
National Park ◽  
Optically Stimulated Luminescence ◽  
Early Holocene ◽  
Fault Rupture ◽  
Elapsed Time ◽  
Rupture Length ◽  
Open Questions ◽  
History Of ◽  
Teton Range ◽  
Lake Site

ABSTRACT Prominent scarps on Pinedale glacial surfaces along the eastern base of the Teton Range confirm latest Pleistocene to Holocene surface-faulting earthquakes on the Teton fault, but the timing of these events is only broadly constrained by a single previous paleoseismic study. We excavated two trenches at the Leigh Lake site near the center of the Teton fault to address open questions about earthquake timing and rupture length. Structural and stratigraphic evidence indicates two surface-faulting earthquakes at the site that postdate deglacial sediments dated by radiocarbon and optically stimulated luminescence to ∼10–11  ka. Earthquake LL2 occurred at ∼10.0  ka (9.7–10.4 ka; 95% confidence range) and LL1 at ∼5.9  ka (4.8–7.1 ka; 95%). LL2 predates an earthquake at ∼8  ka identified in the previous paleoseismic investigation at Granite Canyon. LL1 corresponds to the most recent Granite Canyon earthquake at ∼4.7–7.9  ka (95% confidence range). Our results are consistent with the previously documented long-elapsed time since the most recent Teton fault rupture and expand the fault’s earthquake history into the early Holocene.

scholarly journals Inquiry-Based Geology Field Course for In-Service Educators

2014 ◽  
Vol 37 ◽  
pp. 124-125
Author(s):  
David Harwood ◽  
Kyle Thompson
Keyword(s):  
Natural History ◽  
South Dakota ◽  
National Park ◽  
Grand Teton National Park ◽  
Excellent Opportunity ◽  
History Of ◽  
Teton Range ◽  
Park Area

Eight in-service teachers and two instructors engaged in an inquiry-based geology field course from June 14 to 29, 2014 through Wyoming, South Dakota, and Nebraska. This team of learners spent three days in mid-June working in the Grand Teton National Park area. The UW-NPS facilities provide an excellent opportunity for participants to discover the natural history of the Teton Range, as well as close-out a few projects while sitting in a real chair, at a real table, a welcome change from our usual campground setting.

scholarly journals A Distributional and Habitat Study of the Bighorn Sheep in Winter, Grand Teton National Park

1978 ◽  
Vol 2 ◽  
pp. 53-56
Author(s):  
Michael Whitfield ◽  
Barry Keller
Keyword(s):  
National Park ◽  
Field Studies ◽  
Bighorn Sheep ◽  
Ovis Canadensis ◽  
Population Status ◽  
Grand Teton National Park ◽  
Habitat Factors ◽  
History Of ◽  
Teton Range

This study was initiated in order to determine the population status of bighorn sheep (Ovis canadensis) in the Teton Range. Intensive field studies were initiated in the summer of 1978 and will be continued during the winter of 1978-79 in order to delineate the distribution of sheep and to relate this distribution to habitat factors which affect seasonal distributions. Additionally, information on the history of bighorn sheep has been sought through interviews of longtime residents of the several valleys surrounding the Teton Range.

scholarly journals A High-Resolution Geophysical Survey of Jenny Lake: Using Lake Sediments to Construct a Continuous Record of Tectonic Activity and Earthquake-Triggered Disturbances at Grand Teton National Park

2015 ◽  
Vol 38 ◽  
pp. 2-7
Author(s):  
Darren Larsen ◽  
Mark Abbot
Keyword(s):  
Lake Sediments ◽  
National Park ◽  
Sediment Cores ◽  
Tectonic Activity ◽  
Slope Failures ◽  
Grand Teton National Park ◽  
Field Investigations ◽  
History Of ◽  
Teton Range ◽  
Fault Scarps

The Teton Range, WY contains a legacy of late Cenozoic uplift and periodic Quaternary glaciations. Well-preserved fault scarps along the Teton fault displace glacier deposits from the most recent (Pinedale) glaciation and provide evidence for high fault activity during the past ~15,000 years. Observations of these scarps and previous field investigations indicate that postglacial fault offset occurred through a series of major, scarp-forming earthquakes. However, the postglacial paleoseismic record of the Teton fault remains incomplete. The goal of this project is to use lake sediments, contained in lake basins positioned on the fault, to construct a history of the timing and frequency of past earthquakes at Grand Teton National Park, and assess seismic impacts on diment erosion (e.g., landslides, debris flows, slope failures) and future hazard potential. Here, we report on multibeam sonar bathymetry and seismic reflection images from Jenny Lake, collected as part of an effort to identify glacial and tectonic landforms and to characterize infill stratigraphy. Our overarching objective is to combine these datasets with lake sediment cores from Jenny Lake and other nearby lakes to construct a continuous, accurately-dated record of past earthquakes and earthquake-generated slope failures in the Tetons.

Postglacial Mw 7.0–7.5 Earthquakes on the North Olympic Fault Zone, Washington

2020 ◽  
Author(s):  
Elizabeth R. Schermer ◽  
Colin B. Amos ◽  
William Cody Duckworth ◽  
Alan R. Nelson ◽  
Stephen Angster ◽  
...  
Keyword(s):  
Fault Zone ◽  
Single Event ◽  
Fault Rupture ◽  
Time Intervals ◽  
Slip Rates ◽  
Permanent Strain ◽  
Rupture Length ◽  
The North ◽  
Slip History ◽  
History Of

ABSTRACT Holocene crustal faulting in the northern Olympic Peninsula of Washington State manifests in a zone of west-northwest-striking crustal faults herein named the North Olympic fault zone, which extends for ∼80  km along strike and includes the Lake Creek–Boundary Creek fault to the east and the Sadie Creek fault and newly discovered scarps to the west. This study focuses on the Sadie Creek fault, which extends for >14  km west-northwest from Lake Crescent. Airborne light detection and ranging (lidar) imagery reveals the trace of the Sadie Creek fault and offset postglacial landforms showing a history of Holocene surface-rupturing earthquakes dominated by dextral displacement along a steeply dipping fault zone. Paleoseismic trenches at two sites on the Sadie Creek fault reveal till and outwash overlain by progressively buried forest and wetland soils developed on scarp-derived colluvial wedges. Trench exposures of complex faulting with subhorizontal slickenlines indicate dextral displacement with lesser dip slip. Correlation of broadly constrained time intervals for earthquakes at the Sadie Creek sites and those to the east along the Lake Creek–Boundary Creek fault is consistent with rupture of much of the length of the North Olympic fault zone three to four times: at about 11, 7, 3, and 1 ka, with a shorter rupture at about 8.5 ka. Dated ruptures from trenches only partially coincide with coseismic landslides and megaturbidites in Lake Crescent, indicating that some earthquakes did not trigger megaturbidites, and some turbidites were unrelated to local fault rupture. Landform mapping suggests single-event dextral displacement of 4±1  m on the Sadie Creek fault. Inferred maximum rupture length and single-event slip imply earthquake magnitudes Mw 7.0–7.5. Dextral slip rates of 1.3–2.3  mm/yr and the ∼11,000  yr slip history suggest that the North Olympic fault zone is a prominent contributor to permanent strain in the northern Cascadia fore-arc.

Holocene earthquake history and slip rate of the southern Teton fault, Wyoming, USA

2019 ◽  
Vol 132 (7-8) ◽  
pp. 1566-1586 ◽  
Author(s):  
Christopher B. DuRoss ◽  
Ryan D. Gold ◽  
Richard W. Briggs ◽  
Jaime E. Delano ◽  
Dean A. Ostenaa ◽  
...  
Keyword(s):  
Slip Rate ◽  
Normal Fault ◽  
Alluvial Fan ◽  
Early Holocene ◽  
Data Sets ◽  
History Of ◽  
Teton Range ◽  
Geomorphic Surfaces ◽  
Fault Record ◽  
Earthquake Cycles

Abstract The 72-km-long Teton normal fault bounds the eastern base of the Teton Range in northwestern Wyoming, USA. Although geomorphic surfaces along the fault record latest Pleistocene to Holocene fault movement, the postglacial earthquake history of the fault has remained enigmatic. We excavated a paleoseismic trench at the Buffalo Bowl site along the southernmost part of the fault to determine its Holocene rupture history and slip rate. At the site, ∼6.3 m of displacement postdates an early Holocene (ca. 10.5 ka) alluvial-fan surface. We document evidence of three surface-faulting earthquakes based on packages of scarp-derived colluvium that postdate the alluvial-fan units. Bayesian modeling of radiocarbon and luminescence ages yields earthquake times of ca. 9.9 ka, ca. 7.1 ka, and ca. 4.6 ka, forming the longest, most complete paleoseismic record of the Teton fault. We integrate these data with a displaced deglacial surface 4 km NE at Granite Canyon to calculate a postglacial to mid-Holocene (14.4–4.6 ka) slip rate of ∼1.1 mm/yr. Our analysis also suggests that the postglacial to early Holocene (14.4–9.9 ka) slip rate exceeds the Holocene (9.9–4.6 ka) rate by a factor of ∼2 (maximum of 3); however, a uniform rate for the fault is possible considering the 95% slip-rate errors. The ∼5 k.y. elapsed time since the last rupture of the southernmost Teton fault implies a current slip deficit of ∼4–5 m, which is possibly explained by spatially/temporally incomplete paleoseismic data, irregular earthquake recurrence, and/or variable per-event displacement. Our study emphasizes the importance of minimizing slip-rate uncertainties by integrating paleoseismic and geomorphic data sets and capturing multiple earthquake cycles.

From Competition to Cooperation: A History of Canada–US National Park Relations

2019 ◽  
Author(s):  
Terence Young ◽  
Alan MacEachern ◽  
Lary Dilsaver
Keyword(s):  
National Parks ◽  
National Park ◽  
The United States ◽  
The Us ◽  
Park Service ◽  
Settler Societies ◽  
History Of ◽  
Relationship Of ◽  
Flow Of Information ◽  
The Relationship

This essay explores the evolving international relationship of the two national park agencies that in 1968 began to offer joint training classes for protected-area managers from around the world. Within the British settler societies that dominated nineteenth century park-making, the United States’ National Park Service (NPS) and Canada’s National Parks Branch were the most closely linked and most frequently cooperative. Contrary to campfire myths and nationalist narratives, however, the relationship was not a one-way flow of information and motivation from the US to Canada. Indeed, the latter boasted a park bureaucracy before the NPS was established. The relationship of the two nations’ park leaders in the half century leading up to 1968 demonstrates the complexity of defining the influences on park management and its diffusion from one country to another.

Into Russian Nature

2020 ◽  
Author(s):  
Alan D. Roe
Keyword(s):  
World War Ii ◽  
Environmental Protection ◽  
National Parks ◽  
International Organizations ◽  
National Park ◽  
World War ◽  
Nature Protection ◽  
Soviet Government ◽  
History Of ◽  
Development Goals

Into Russian Nature examines the history of the Russian national park movement. Russian biologists and geographers had been intrigued with the idea of establishing national parks before the Great October Revolution but pushed the Soviet government successfully to establish nature reserves (zapovedniki) during the USSR’s first decades. However, as the state pushed scientists to make zapovedniki more “useful” during the 1930s, some of the system’s staunchest defenders started supporting tourism in them. In the decades after World War II, the USSR experienced a tourism boom and faced a chronic shortage of tourism facilities. Also during these years, Soviet scientists took active part in Western-dominated international environmental protection organizations, where they became more familiar with national parks. In turn, they enthusiastically promoted parks for the USSR as a means to reconcile environmental protection and economic development goals, bring international respect to Soviet nature protection efforts, and help instill a love for the country’s nature and a desire to protect it in Russian/Soviet citizens. By the late 1980s, their supporters pushed transformative, and in some cases quixotic, park proposals. At the same time, national park opponents presented them as an unaffordable luxury during a time of economic struggle, especially after the USSR’s collapse. Despite unprecedented collaboration with international organizations, Russian national parks received little governmental support as they became mired in land-use conflicts with local populations. While the history of Russia’s national parks illustrates a bold attempt at reform, the state’s failure’s to support them has left Russian park supporters deeply disillusioned.

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