Publications
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Seismic monitoring solutions for buildings
This chapter introduces seismic monitoring of structural systems for buildings and begins with a historical background of this topic in the United States. After providing the historical context, the chapter reviews common seismic instrumentation issues such as utilization of data, code versus extensive instrumentation, free-field instrumentation, record synchronization requirements and more. Recen
Authors
Mehmet Çelebi, Yavuz Kaya
Real-time earthquake detection and alerting behavior of PLUM ground-motion-based early warning in the United States
We examine the real‐time earthquake detection and alerting behavior of the Propagation of Local Undamped Motion (PLUM) earthquake early warning (EEW) algorithm and compare PLUM’s performance with the real‐time performance of the current source‐characterization‐based ShakeAlert System. In the United States (U.S.), PLUM uses a two‐station approach to detect earthquakes. Once a detection is confirmed
Authors
Jessie Kate Saunders, Sarah E. Minson, Annemarie S. Baltay, Julian J Bunn, Elizabeth S. Cochran, Deborah L. Kilb, Colin T O'Rourke, Mitsuyuki Hoshiba, Yuki Kodera
Comparisons of the NGA-Subduction ground motion models
In this article, ground-motion models (GMMs) for subduction earthquakes recently developed as part of the Next Generation Attenuation-Subduction (NGA-Sub) project are compared. The four models presented in this comparison study are documented in their respective articles submitted along with this article. Each of these four models is based on the analysis of the large NGA-Sub database. Three of th
Authors
Nick Gregor, Kofi O. Addo, Norman A. Abrahamson, Linda Al Atik, Gail M. Atkinson, David Boore, Yousef Bozorgnia, Kenneth W. Campbell, Brian S.-J. Chiou, Zeynep Gulerce, Behzad Hassani, Tadahiro Kishida, Nicolas Kuehn, Silvia Mazzoni, Saburoh Midorikawa, Grace Alexandra Parker, Hongjun Si, Jonathan P. Stewart, Robert R. Youngs
The global seismographic network reveals atmospherically coupled normal modes excited by the 2022 Hunga Tonga eruption
The eruption of the submarine Hunga Tonga-Hunga Haʻapai (Hunga Tonga) volcano on 15 January 2022, was one of the largest volcanic explosions recorded by modern geophysical instrumentation. The eruption was notable for the broad range of atmospheric wave phenomena it generated and for their unusual coupling with the oceans and solid Earth. The event was recorded worldwide across the Global Seismogr
Authors
Adam T. Ringler, Robert E. Anthony, Rick Aster, T. Taira, Brian Shiro, David C. Wilson, S. H. De Angelis, C. Ebeling, Matthew M. Haney, R. Matoza, H. Ortiz
Crustal permeability changes observed from seismic attenuation: Impacts on multi-mainshock sequences
We use amplitude ratios from narrowband-filtered earthquake seismograms to measure variations of seismic attenuation over time, providing unique insights into the dynamic state of stress in the Earth’s crust at depth. Our dataset from earthquakes of the 2016-2017 Central Apennines sequence allows us to obtain high-resolution time histories of seismic attenuation (frequency band: 0.5-30 Hz) charact
Authors
Luca Malagnini, Thomas E. Parsons, Irene Munafo, Simone Mancini, Margarita Segou, Eric L. Geist
Graphite as an electrically conductive indicator of ancient crustal-scale fluid flow within mineral systems
Magnetotelluric (MT) imaging results from mineral provinces in Australia and in the United States show an apparent spatial relationship between crustal-scale electrical conductivity anomalies and major magmatic-hydrothermal iron oxide-apatite/iron oxide-copper-gold (IOA-IOCG) deposits. Although these observations have driven substantial interest in the use of MT data to image ancient fluid pathway
Authors
Benjamin Scott Murphy, Jan Marten Huizenga, Paul A. Bedrosian
The evolution of rock friction is more sensitive to slip than elapsed time, even at near-zero slip rates
For many decades, frictional strength increase at low slip rates has been ascribed to time-dependent contact-area growth across the sliding interface. As a result, phenomenological models that correctly predict contact-area growth, as observed in laboratory experiments, have also been widely assumed to be appropriate descriptors of frictional strength evolution. We present experiments that impose
Authors
Pathikrit Bhattacharyaa, Allan Rubin, Terry Tullis, Nicholas M. Beeler, Keishi Okazaki
Achievements and prospects of global broadband seismographic networks after 30 years of continuous geophysical observations
Global seismographic networks (GSNs) emerged during the late nineteenth and early twentieth centuries, facilitated by seminal international developments in theory, technology, instrumentation, and data exchange. The mid- to late-twentieth century saw the creation of the World-Wide Standardized Seismographic Network (1961) and International Deployment of Accelerometers (1976), which advanced global
Authors
Adam T. Ringler, Robert E. Anthony, R. C. Aster, C. J. Ammon, S. Arrowsmith, Harley M. Benz, C. Ebeling, A. Frassetto, W. Y. Kim, Paula Koelemeijer, H. C. P. Lau, V. Lekic, J. P. Montagner, P. G. Richards, D. P. Schaff, M. Vallee, William L. Yeck
Thermophysical and compositional properties of paleobedforms on Mars
Bedforms on Earth and Mars are often preserved in the rock record in the form of sedimentary rock with distinct cross-bedding. On rare occasions, the full-surface geometry of a bedform can be preserved through burial and lithification. These features, known as paleobedforms, are found in a variety of geographic locations on Mars. Evidence in the morphology of paleobedforms, such as the retention o
Authors
Aaron R. Weintraub, Christopher S. Edwards, Matthew Chojnacki, Lauren A. Edgar, Lori K. Fenton, Sylvain Piqueux, Amber Gullikson
The formation mechanisms for mid-latitude ice scarps on Mars
Mid-latitude exposed ice scarps have recently been identified on Mars (Dundas et al., 2018; 2021). The presence of such surface ice exposures at relatively low latitudes was itself a mystery, and the formation dynamics of such scarps have also not been explained. In this work we model the ice ablation rates of several identified mid-latitude scarps. We find that, given certain characteristics of t
Authors
Kaj E. Williams, Colin M. Dundas, Melinda A. Kahre
Martian gully activity and the gully sediment transport system
The formation process for Martian gullies is a critical unknown for understanding recent climate conditions. Leading hypotheses include formation by snowmelt in a past climate, or formation via currently active CO2 frost processes. This paper presents an expanded catalog of >300 recent flows in gullies. The results indicate that sediment transport in current gully flows moves the full range of mat
Authors
Colin M. Dundas, Susan J. Conway, Glen E. Cushing
Can we accurately estimate sediment budgets on Mars?
Sediment budgets are fundamentally important for planetary science. However, only one primary method, based on remote sensing, is currently available for determining extraterrestrial sediment budgets. For determining sediment budgets on Earth, both in-situ and remote sensing methods are available. Despite the widespread use of the two methods, there has been surprisingly little research on how wel
Authors
Joel B. Sankey, Alan Kasprak, Matthew Chojnacki, Timothy N. Titus, Joshua Caster, Geoffrey DeBenedetto