Subduction Zone Science

Publications

Filter Total Items: 108
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Year Published: 2021

Toward an integrative geological and geophysical view of Cascadia subduction zone earthquakes

The Cascadia subduction zone (CSZ) is an exceptional geologic environment for recording evidence of land level changes, tsunamis, and ground motion that reveals at least 19 great megathrust earthquakes over the past 10 kyr. Such earthquakes are among the most impactful natural hazards on Earth, transcend national boundaries, and can have global...

Walton, Maureen A. L.; Staisch, Lydia M.; Dura, Tina; Pearl, Jessie Kathleen; Sherrod, Brian; Gomberg, Joan S.; Engelhart, Simon E.; Trehu, Anne; Watt, Janet; Perkins, Jonathan P; Witter, Robert C.; Bartlow, Noel; Goldfinger, Chris; Kelsey, Harvey; Morey, Ann; Sahakian, Valerie J.; Tobin, Harold; Wang, Kelin; Wells, Ray; Wirth, Erin

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Year Published: 2020

Localized fluid discharge by tensile cracking during the post-seismic period in subduction zones

It is thought that extensional structures (extensional cracks and normal faults) generated during the post-seismic period create fluid pathways that enhance the drainage of the subducting plate interface, thus reducing the pore pressure and increasing fault strength. However, it remains to be elucidated how much pore fluid pressure decreases by...

Otsubo, Makoto; Hardebeck, Jeanne L.; Miyakawa, Ayumu; Yamaguchi, Asuka; Kimura, Gaku

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Year Published: 2020

Segmentation and supercycles: A catalog of earthquake rupture patterns from the Sumatran Sunda Megathrust and other well-studied faults worldwide

After more than 100 years of earthquake research, earthquake forecasting, which relies on knowledge of past fault rupture patterns, has become the foundation for societal defense against seismic natural disasters. A concept that has come into focus more recently is that rupture segmentation and cyclicity can be complex, and that a characteristic...

Philibosian, Belle; Meltzner, Aron J.

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Year Published: 2020

Selected geologic maps of the Kodiak batholith and other Paleocene intrusive rocks, Kodiak Island, Alaska

Kodiak Island in southern Alaska is one of the premier examples globally for the study of forearc magmatism. This location contains two Paleocene intrusive belts that formed due to the subduction of a migrating spreading ridge and slab-window: the Kodiak batholith and the trenchward magmatic belt. These magmatic rocks are part of the Sanak-Baranof...

Farris, David W.; Haeussler, Peter J.
Farris, D.W., and Haeussler, P.J., 2020, Selected geologic maps of the Kodiak batholith and other Paleocene intrusive rocks, Kodiak Island, Alaska: U.S. Geological Survey Scientific Investigations Map 3441, pamphlet 10 p., scale 1:50,000, https://doi.org/10.3133/sim3441.

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Year Published: 2020

Submarine canyons, slope failures and mass transport processes in southern Cascadia

The marine turbidite record along the southern Cascadia Subduction Zone has been used to interpret paleoseismicity and suggest a shorter recurrence interval for large (>M7) earthquakes along this portion of the margin; however, the sources and pathways of these turbidity flows are poorly constrained. We examine the spatial distribution of...

Hill, Jenna C.; Watt, Janet; Brothers, Daniel; Kluesner, Jared

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Year Published: 2020

The role of seismic and slow slip events in triggering the 2018 M7.1 Anchorage earthquake in the Southcentral Alaska subduction zone

The M 7.1 2018 Anchorage earthquake occurred in the bending part of the subducting North Pacific plate near the geometrical barrier formed by the underthrusting Yakutat terrane. We calculate the triggering potential related with stress redistribution from deformation sources including the M 9.2 1964 earthquake coseismic slip,...

Segou, Margarita; Parsons, Thomas E.

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Year Published: 2020

Subduction megathrust heterogeneity characterized from 3D seismic data

Megathrust roughness and structural complexity are thought to be controls on earthquake slip at subduction zones because they result in heterogeneity in shear strength and resolved stress. However, because active megathrust faults are difficult to observe, the causes and scales of complexity are largely unknown. Here we measured the in situ...

Kirkpatrick, James D.; Edwards, Joel H.; Verdecchia, Alessandro; Kluesner, Jared; Harrington, Rebecca M.; Silver, Eli

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Year Published: 2020

Structural control on megathrust rupture and slip behavior: Insights from the 2016 Mw 7.8 Pedernales Ecuador earthquake

The heterogeneous seafloor topography of the Nazca Plate as it enters the Ecuador subduction zone provides an opportunity to document the influence of seafloor roughness on slip behavior and megathrust rupture. The 2016 Mw 7.8 Pedernales Ecuador earthquake was followed by a rich and active postseismic sequence. An internationally coordinated rapid...

Soto-Cordero, Lillian; Meltzer, Anne; Bergman, Eric A.; Hoskins, Mariah; Stachnik, Joshua C.; Agurto-Detzel, Hans; Alvarado, Alexandra; Beck, Susan L.; Charvis, Philippe; Font, Yvonne; Hayes, Gavin P.; Hernandez, Stephen; Leon-Rios, Sergio; Lynner, Colton; Nocquet, Jean-Mathieu; Regnier, Marc; Rietbrock, Andreas; Rolandone, Frederique; Ruiz, Mario

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Year Published: 2019

The 30 November 2018 Mw7.1 Anchorage Earthquake

The Mw">Mw 7.1 47 km deep earthquake that occurred on 30 November 2018 had deep societal impacts across southcentral Alaska and exhibited phenomena of broad scientific interest. We document observations that point to future directions of research and hazard mitigation. The rupture mechanism, aftershocks, and deformation of the...

West, Michael E.; Bender, Adrian; Gardine, Matthew; Gardine, Lea; Gately, Kara; Haeussler, Peter; Hassan, Wael; Meyer, Franz; Richards, Cole; Ruppert, Natalia; Tape, Carl; Thornley, John; Witter, Robert

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Year Published: 2019

SKS splitting beneath Mount St. Helens: Constraints on subslab mantle entrainment

Observations of seismic anisotropy can provide direct constraints on the character of mantle flow in subduction zones, critical for our broader understanding of subduction dynamics. Here we present over 750 new SKS splitting measurements in the vicinity of Mount St. Helens in the Cascadia subduction zone using a combination of stations from the...

Eakin, Caroline M; Wirth, Erin A.; Wallace, Abraham; Ulberg, Carl W; Creager, Kenneth C; Abers, Geoffrey A

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Year Published: 2019

Volcanic hazards in the Pacific U.S. Territories

The Commonwealth of the Northern Mariana Islands, Guam, and American Samoa lie along the western side of the famed Pacific Ring of Fire. Here, the processes of active island and submarine volcanoes produce activity both underwater and in the atmosphere that poses potential hazards to the daily lives of residents and...

Tepp, Gabrielle; Shiro, Brian; Chadwick, William W.
Tepp, G., Shiro, B., and Chadwick, W., 2019, Volcanic hazards in the Pacific U.S. territories: U.S. Geological Survey Fact Sheet 2019–3036, 6 p., https://doi.org/10.3133/fs20193036.

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Year Published: 2019

Isotopic and petrologic investigation, and a thermomechanical model of genesis of large-volume rhyolites in arc environments: Karymshina Volcanic Complex, Kamchatka, Russia

The Kamchatka Peninsula of eastern Russia is currently one of the most volcanically active areas on Earth where a combination of >8 cm/yr subduction convergence rate and thick continental crust generates large silicic magma chambers, reflected by abundant large calderas and caldera complexes. This study examines the largest center of silicic 4-...

Bindeman, Ilya N.; Leonov, Vladimir L.; Colòn, Dylan P.; Rogozin, Aleksey N.; Shipley, Niccole; Jicha, Brian; Loewen, Matthew W.; Gerya, Taras V.