Effects of lithospheric viscoelastic relaxation on the contemporary deformation following the 1959 Mw 7.3 Hebgen Lake, Montana, earthquake and other areas of the intermountain seismic belt

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题名:	Effects of lithospheric viscoelastic relaxation on the contemporary deformation following the 1959 Mw 7.3 Hebgen Lake, Montana, earthquake and other areas of the intermountain seismic belt
作者:	張午龍;Chang, Wu-Lung;Smith, Robert B.;Puskas, Christine M.
贡献者:	地球科學學院地球科學學系
关键词:	Deformation;Earthquakes;Fault lines;Lakes;Lithosphere;Rheology;Seismic activity;Upper mantle;Volcanic fields;Volcanoes
日期:	2013-01-01
上传时间:	2026-04-23 11:32:49 (UTC+8)
出版者:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
摘要:	摘要： The 1959 Mw 7.3 Hebgen Lake, MT, normal‐faulting earthquake occurred in an extensional stress regime near the Yellowstone volcanic field. Time‐dependent crustal deformation data following this major earthquake were acquired by precise trilateration and GPS surveys from 1973 to 2000 around the Hebgen Lake fault zone. Modeling the changes of baseline lengths across and near the fault reveals a lateral variation of transient rheology, in which the lithosphere is stronger near the Hebgen Lake fault zone than in the vicinity of the Yellowstone volcano system. The models also imply that the lower crust is stronger than the upper mantle, in agreement with results from studies of postseismic and post‐lake‐filling relaxations (<~100 years). In addition, evaluations of the postseismic motion produced by the Hebgen Lake and the 1983 Mw 6.9 Borah Peak, ID, earthquakes indicate that horizontal transient motion of up to ~1 mm/yr contribute significantly to the contemporary regional crustal deformation near the epicentral areas. For the eastern Basin and Range, ~500 km south of the Hebgen Lake fault, similar rheologic models were derived from the observed uplift associated with the Lake Bonneville rebound and were used to evaluate the postseismic deformation associated with six most recent paleoearthquakes of the Wasatch fault zone and three M ≥ 5.6 historic earthquakes of northern Utah. The results show ≤0.1 mm/yr of horizontal postseismic motion at present time that are within the horizontal uncertainties of continuous GPS velocity from the Basin and Range and significantly smaller than the contemporary extension of 1–3 mm/yr in the Wasatch Front. Key Points Get insights into earthquake cycle of large normal‐faulting earthquakes Study crust and mantle rheology in the Yellowstone volcano‐tectonic area Combine most recent GPS observations with precise trilateraion and leveling data 其他題名： Geochem. Geophys. Geosyst 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2013-01 出處： Geochemistry, geophysics, geosystems : G3, 2013-01, Vol.14 (1), p.1-17 資源來源： Alma/SFX Local Collection 版權： 2013. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 1525-2027 識別號： EISSN: 1525-2027 識別號： DOI: 10.1029/2012GC004424
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