Publications
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The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty The Iquique earthquake sequence of April 2014: Bayesian modeling accounting for prediction uncertainty
The subduction zone in northern Chile is a well-identified seismic gap that last ruptured in 1877. On 1 April 2014, this region was struck by a large earthquake following a two week long series of foreshocks. This study combines a wide range of observations, including geodetic, tsunami, and seismic data, to produce a reliable kinematic slip model of the Mw=8.1 main shock and a static...
Authors
Zacharie Duputel, Junle Jiang, Romain Jolivet, Mark Simons, Luis Rivera, Jean-Paul Ampuero, Bryan Riel, Susan E Owen, Angelyn W Moore, Sergey V Samsonov, Francisco Ortega Culaciati, Sarah E. Minson
Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States Ground motion-simulations of 1811-1812 New Madrid earthquakes, central United States
We performed a suite of numerical simulations based on the 1811–1812 New Madrid seismic zone (NMSZ) earthquakes, which demonstrate the importance of 3D geologic structure and rupture directivity on the ground‐motion response throughout a broad region of the central United States (CUS) for these events. Our simulation set consists of 20 hypothetical earthquakes located along two faults...
Authors
L. Ramirez-Guzman, Robert Graves, Kim Olsen, Oliver S. Boyd, Chris H. Cramer, Stephen H. Hartzell, Sidao Ni, Paul G. Somerville, Robert Williams, Jinquan Zhong
Development of the Global Earthquake Model’s neotectonic fault database Development of the Global Earthquake Model’s neotectonic fault database
The Global Earthquake Model (GEM) aims to develop uniform, openly available, standards, datasets and tools for worldwide seismic risk assessment through global collaboration, transparent communication and adapting state-of-the-art science. GEM Faulted Earth (GFE) is one of GEM’s global hazard module projects. This paper describes GFE’s development of a modern neotectonic fault database...
Authors
Annemarie Christophersen, Nicola Litchfield, Kelvin Berryman, Richard Thomas, Roberto Basili, Laura Wallace, William Ries, Gavin P. Hayes, Kathleen M. Haller, Toshikazu Yoshioka, Richard D. Koehler, Dan Clark, Monica Wolfson-Schwehr, Margaret S. Boettcher, Pilar Villamor, Nick Horspool, Teraphan Ornthammarath, Ramon Zuniga, Robert M. Langridge, Mark W. Stirling, Tatiana Goded, Carlos Costa, Robert Yeats
Ionospheric current source modeling and global geomagnetic induction using ground geomagnetic observatory data Ionospheric current source modeling and global geomagnetic induction using ground geomagnetic observatory data
Long-period global-scale electromagnetic induction studies of deep Earth conductivity are based almost exclusively on magnetovariational methods and require accurate models of external source spatial structure. We describe approaches to inverting for both the external sources and three-dimensional (3-D) conductivity variations and apply these methods to long-period (T≥1.2 days)...
Authors
Jin Sun, Anna Kelbert, G. D. Egbert
Blind identification of the Millikan Library from earthquake data considering soil–structure interaction Blind identification of the Millikan Library from earthquake data considering soil–structure interaction
The Robert A. Millikan Library is a reinforced concrete building with a basement level and nine stories above the ground. Located on the campus of California Institute of Technology (Caltech) in Pasadena California, it is among the most densely instrumented buildings in the U.S. From the early dates of its construction, it has been the subject of many investigations, especially regarding...
Authors
S. F. Ghahari, F. Abazarsa, O. Avci, Mehmet Çelebi, E. Taciroglu
Hydrothermal alteration and diagenesis of terrestrial lacustrine pillow basalts: Coordination of hyperspectral imaging with laboratory measurements Hydrothermal alteration and diagenesis of terrestrial lacustrine pillow basalts: Coordination of hyperspectral imaging with laboratory measurements
We investigate an outcrop of ∼187 Ma lacustrine pillow basalts of the Talcott Formation exposed in Meriden, Connecticut, USA, focusing on coordinated analyses of one pillow lava to characterize the aqueous history of these basalts in the Hartford Basin. This work uses a suite of multidisciplinary measurements, including hyperspectral imaging, other spectroscopic techniques, and chemical...
Authors
Rebecca N Greenberger, John F Mustard, Edward A. Cloutis, Paul Mann, Janette H. Wilson, Roberta L Flemming, Kevin Robertson, Mark R Salvatore, Christopher Edwards
Regional seismic-wave propagation from the M5.8 23 August 2011, Mineral, Virginia, earthquake Regional seismic-wave propagation from the M5.8 23 August 2011, Mineral, Virginia, earthquake
The M5.8 23 August 2011 Mineral, Virginia, earthquake was felt over nearly the entire eastern United States and was recorded by a wide array of seismic broadband instruments. The earthquake occurred ~200 km southeast of the boundary between two distinct geologic belts, the Piedmont and Blue Ridge terranes to the southeast and the Valley and Ridge Province to the northwest. At a dominant...
Authors
Frederick Pollitz, Walter D. Mooney
Aurora painting pays tribute to Civil War's end Aurora painting pays tribute to Civil War's end
This year marks the sesquicentennial anniversary of the end of the American Civil War, a conflict that Abraham Lincoln called a “mighty scourge.” It was one of the most poignant periods in U.S. history, laying bare political, economic, social, and moral divergence between Northern and Southern states. The cause of the divergence that led to war was slavery [e.g., McPherson, 1988, chap. 3...
Authors
Jeffrey J. Love
A quick SEED tutorial A quick SEED tutorial
Introduction A number of different government-funded seismic data centers offer free open-access data (e.g., U.S. Geological Survey, National Earthquake Information Center, the Incorporated Research Institutions for Seismology (IRIS), and Data Management System), which can be freely downloaded and shared among different members of the community (Lay, 2009). To efficiently share data, it...
Authors
Adam T. Ringler, John R. Evans
Scaling and design of landslide and debris-flow experiments Scaling and design of landslide and debris-flow experiments
Scaling plays a crucial role in designing experiments aimed at understanding the behavior of landslides, debris flows, and other geomorphic phenomena involving grain-fluid mixtures. Scaling can be addressed by using dimensional analysis or – more rigorously – by normalizing differential equations that describe the evolving dynamics of the system. Both of these approaches show that...
Authors
Richard M. Iverson
Widespread groundwater-level offsets caused by the Mw 5.8 Mineral, Virginia, earthquake of 23 August 2011 Widespread groundwater-level offsets caused by the Mw 5.8 Mineral, Virginia, earthquake of 23 August 2011
Groundwater levels were offset in bedrock observation wells, measured by the U.S. Geological Survey or others, as far as 553 km from the Mw 5.8 Mineral, Virginia (USA), earthquake on 23 August 2011. Water levels dropped as much as 0.47 m in 34 wells and rose as much as 0.15 m in 12 others. In some wells, which are as much as 213 m deep, the water levels recovered from these deviations in...
Authors
Evelyn A. Roeloffs, David L. Nelms, Rodney A. Sheets
Landslides and megathrust splay faults captured by the late Holocene sediment record of eastern Prince William Sound, Alaska Landslides and megathrust splay faults captured by the late Holocene sediment record of eastern Prince William Sound, Alaska
We present new marine seismic‐reflection profiles and bathymetric maps to characterize Holocene depositional patterns, submarine landslides, and active faults beneath eastern and central Prince William Sound (PWS), Alaska, which is the eastern rupture patch of the 1964 Mw 9.2 earthquake. We show evidence that submarine landslides, many of which are likely earthquake triggered, repeatedly...
Authors
S.P. Finn, Lee M. Liberty, Peter J. Haeussler, Thomas L. Pratt