Basement Structure and Styles of Active Tectonic Deformation in Central Interior Alaska

التفاصيل البيبلوغرافية
العنوان: Basement Structure and Styles of Active Tectonic Deformation in Central Interior Alaska
المؤلفون: Catherine L. Hanks, Nilesh C. Dixit
المصدر: Geosciences, Vol 11, Iss 127, p 127 (2021)
Geosciences
Volume 11
Issue 3
بيانات النشر: MDPI AG, 2021.
سنة النشر: 2021
مصطلحات موضوعية: geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Subduction, lcsh:QE1-996.5, transtensional basin, Fault (geology), Structural basin, 010502 geochemistry & geophysics, 01 natural sciences, Gravity anomaly, seismic interpretation, lcsh:Geology, Tectonics, interior Alaska, Basement (geology), Intraplate earthquake, foreland basin, General Earth and Planetary Sciences, potential field modeling, Foreland basin, Geology, Seismology, 0105 earth and related environmental sciences
الوصف: Central Interior Alaska is one of the most seismically active regions in North America, exhibiting a high concentration of intraplate earthquakes approximately 700 km away from the southern Alaska subduction zone. Seismological evidence suggests that intraplate seismicity in the region is not uniformly distributed, but concentrated in several discrete seismic zones, including the Nenana basin and the adjacent Tanana basin. Although the location and magnitude of the seismic activity in both basins are well defined by a network of seismic stations in the region, the tectonic controls on these intraplate earthquakes and the heterogeneous nature of Alaska’s continental interior remain poorly understood. We investigated the crustal structure of the Nenana and Tanana basins using available seismic reflection, aeromagnetic and gravity anomaly data, supplemented by geophysical well logs and outcrop data. We developed nine new two-dimensional forward models to delineate internal geometries and the crustal structure of Alaska’s interior. The results of our study demonstrates a strong crustal heterogeneity beneath both basins. The Tanana basin is a relatively shallow (up to 2 km) asymmetrical foreland basin with its southern, deeper side controlled by the northern foothills of the Central Alaska Range. Northeast-trending left lateral strike-slip faults within the Tanana basin are interpreted as a zone of clockwise crustal block rotation. The Nenana basin has a fundamentally different geometry. It is a deep (up to 8 km), narrow transtensional pull-apart basin that is deforming along the left-lateral Minto Fault. This study identifies two distinct modes of current tectonic deformation in Central Interior Alaska and provides a basis for modeling the interplay between intraplate stress fields and major structural features that potentially influence the generation of intraplate earthquakes in the region.
وصف الملف: application/pdf
اللغة: English
تدمد: 2076-3263
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::344de5800392945fec870d60f33292b0
https://www.mdpi.com/2076-3263/11/3/127
Rights: OPEN
رقم الانضمام: edsair.doi.dedup.....344de5800392945fec870d60f33292b0
قاعدة البيانات: OpenAIRE