Tectonics and Seismic Structure of Alaska and Northwestern Canada

List of Contributors ix

Preface xiii

Acknowledgments xvii

About the Companion Website xix

Part I An Introduction to the EarthScope Networks

1 EarthScope Networks in Alaska and Northwestern Canada 3
Jeffrey T. Freymueller and Michael E. West

2 Perspectives on Transportable Array Alaska Background Noise Levels 15
Adam T. Ringler, Kasey Aderhold, Robert E. Anthony, Robert W. Busby, Andy Frassetto, Toshiro Tanimoto, and David C. Wilson

Part II Synthesis Studies of Alaska and Northwestern Canada: From the Crust to the Lower Mantle

3 A Decade of Alaska Seismicity: 2013–2022 47
Natalia A. Ruppert

4 Updating the Crustal Fault Model for the 2023 National Seismic Hazard Model for Alaska 85
Peter J. Haeussler, Adrian M. Bender, Peter M. Powers, Richard D. Koehler, and Daniel S. Brothers

5 Geodetic Observations of Tectonic Deformation in Alaska and Western Canada: The EarthScope Revolution 129
Julie Elliott, Jeffrey T. Freymueller, and Ronni Grapenthin

6 Synthesis of the Seismic Structure of the Greater Alaska Region: Continental Lithosphere 185
Xiaotao Yang, Michael Everett Mann, Karen M. Fischer, Margarete A. Jadamec, Songqiao Shawn Wei, Gary L. Pavlis, and Andrew John Schaeffer Copyrighted Material

7 Structure, Origin, and Deformation of the Lithosphere in the Northern Canadian Cordillera From High-Resolution, Passive-Source Seismic Velocity Models 215
Clement Esteve, Pascal Audet, Derek Leigh Schutt, Richard Craig Aster, Andrew John Schaeffer, and Joel F. Cubley

8 Synthesis of the Seismic Structure of the Greater Alaska Region: Subducting Slab Geometry 237
Gary L. Pavlis, Margarete A. Jadamec, Michael Everett Mann, Xiaotao Yang, Andrew John Schaeffer, Songqiao Shawn Wei, and Karen M. Fischer

9 Synthesis of the Seismic Structure of the Greater Alaska Region: Geodynamics Implications 267
Margarete A. Jadamec, Gary L. Pavlis, Xiaotao Yang, Karen M. Fischer, Songqiao Shawn Wei, Michael Everett Mann, and Andrew John Schaeffer

Part III Aleutian–alaska Subduction: Properties, Interface Structure, and Dynamics

10 An Alaska–Aleutian Subduction Zone Interface Earthquake Recurrence Model From Geology and Geodesy 301
Rich Briggs, Robert C. Witter, Jeffrey T. Freymueller, Peter M. Powers, Peter J. Haeussler, Stephanie L. Ross, Tina Dura, Simon E. Engelhart, Richard D. Koehler, and Hong Kie Thio

11 TectonicTremorObservationsAcrossAlaska 325
Aaron G. Wech

12 Inherited Crustal Features and Southern Alaska Tectonic History Constrained by Sp Receiver Functions 335
Michael Everett Mann, Karen M. Fischer, and Jeffrey A. Benowitz

13 Implications of Variable Plate Coupling Versus Plateau Buoyancy on Subduction Dynamics: A Case Study of the Yakutat Plateau in Alaska 355
Kirstie L. Haynie and Margarete A. Jadamec

14 Constraining the Earthquake Recording Threshold of Intraslab Earthquakes With Turbidites in South-Central Alaska’s Lakes and Fjords 389
Drake M. Singleton, Daniel S. Brothers, Peter J. Haeussler, Robert C. Witter, and Jenna C. Hill

15 Variations in Reflection Signature and Slip Behavior of the Subduction Interface Offshore Alaska Peninsula From 152 ? to 161 ? W 419
Harold Kuehn, Mladen R. Nedimovi?, Donna J. Shillington, and Anne Becel

16 Implications of the 2020–2021 Earthquakes for Megathrust Coupling and Seismicity in the Vicinity of the Shumagin Gap 445
Matthew W. Herman and Kevin P. Furlong

Part IV Transform and Oblique Fault Systems: From the Plate-Boundary Corner to the Northeastern Brooks Range

17 Oblique Contraction Along the Fastest Ocean–Continent Transform Plate Boundary Focuses Rock Uplift West of the Fairweather Fault, Southeast Alaska 463
Robert C. Witter, Harvey M. Kelsey, Richard O. Lease, Adrian M. Bender, Katherine M. Scharer, Peter J. Haeussler, and Daniel S. Brothers

18 Slip Redistribution onto the Totschunda Fault of Southern Alaska: A Result of a Pacific Plate Motion Change at ca 6 Ma 497
Jacob L. Rosenthal, Paul G. Fitzgerald, Jeffrey A. Benowitz, James R. Metcalf, and Paul M. Betka

19 Inherited Upper-Plate Controls on Localized Arc Magmatism Since ca 100 Ma Along the Alaska Range Suture Zone 525
Jeffrey A. Benowitz and Michael Everett Mann

20 Geologic Evolution of the Denali Fault System and Associated Crustal Structure 547
Trevor S. Waldien, Meghan S. Miller, and Sarah M. Roeske

21 Seismicity and Anisotropic Imaging Reveal an Active Detachment Beneath the Northern Alaska Range Foothills 575
Vera Schulte-Pelkum, Adrian M. Bender, and Natalia A. Ruppert

22 The 2018 Kaktovik, Alaska Earthquakes and Their Context: Insights From Seismotectonics, InSAR Geodesy, and Static Stress Changes 589
Chris Rollins, Jeffrey T. Freymueller, Xueming Xue, Stephen G. Holtkamp, Thomas A. Logan, Franz Meyer, and Jason Patton

Index 617