A5074301415- earthquake and tectonic studies
- Seismic Waves and Analysis
- Seismology and Earthquake Studies
- High-pressure geophysics and materials
- Seismic Imaging and Inversion Techniques
- Earthquake Detection and Analysis
- Geological and Geochemical Analysis
- Geophysics and Sensor Technology
- Geological Modeling and Analysis
- Geological Studies and Exploration
- Methane Hydrates and Related Phenomena
- Underwater Acoustics Research
- Landslides and related hazards
- Geological and Geophysical Studies
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Geology and Paleoclimatology Research
- Geological formations and processes
- Reservoir Engineering and Simulation Methods
- Scientific Research and Discoveries
- Forensic Fingerprint Detection Methods
- Structural Response to Dynamic Loads
- Ionosphere and magnetosphere dynamics
- Marine and environmental studies
- Drilling and Well Engineering
University of Utah
2015-2024
Southern University of Science and Technology
2021
John Wiley & Sons (United States)
2018
Charles River Laboratories (Netherlands)
2018
Saint Louis University
2003-2010
UCLouvain Saint-Louis Brussels
2002-2010
Hanscom Air Force Base
2008
Thomas Jefferson National Accelerator Facility
2008
University of Arizona
1998-2001
Planetary Science Institute
1999
Subduction zone plate boundary megathrust faults accommodate relative motions with spatially varying sliding behavior. The 2004 Sumatra‐Andaman (M w 9.2), 2010 Chile 8.8), and 2011 Tohoku 9.0) great earthquakes had similar depth variations in seismic wave radiation across their wide rupture zones – coherent teleseismic short‐period preferentially emanated from the deeper portion of megathrusts whereas largest fault displacements occurred at shallower depths but produced relatively little...
The 27 February 2010 Chile (M w 8.8) earthquake is the fifth largest to strike during age of seismological instrumentation. faulting geometry, slip distribution, seismic moment, and moment‐rate function are estimated from broadband teleseismic P, SH, Rayleigh wave signals. We explore some trade‐offs in rupture‐process estimation due model parameterizations, limited sampling phase velocities, uncertainty fault geometry. average over ∼81,500 km 2 rupture area about 5 m, with concentrations...
The frequency-dependent rupture process of the 11 March 2011 Mw 9.0 off Pacific coast Tohoku Earthquake is examined using backprojection (BP) imaging with teleseismic short-period (~1 s) P waves, and finite faulting models (FFMs) seismic moment slip distributions inverted from broadband (>3 Rayleigh waves regional continuous GPS ground motions. Robust features BPs are initial down-dip propagation energy source a slow speed km/s), followed by faster (2–3 km/s) that progresses southwestward...
The M w 7.9 Wenchuan earthquake of 12 May 2008 was the most destructive Chinese since 1976 Tangshan event. Tens thousands people were killed, hundreds injured, and millions left homeless. Here we infer detailed rupture process by back‐projecting teleseismic P energy from several arrays seismometers. This technique has only recently become feasible is potentially faster than traditional finite‐fault inversion body waves; therefore, it may reduce notification time to emergency response...
Delineating Deep Faults Most large, damaging earthquakes initiate in Earth's crust where friction and brittle fracture control the release of energy. Strong can occur mantle too, but their rupture dynamics are difficult to determine because higher temperatures pressures play a more important role. Ye et al. (p. 1380 ) analyzed seismic P waves generated by 2013 M w 8.3 Sea Okhotsk earthquake—the largest deep earthquake recorded date—and its associated aftershocks. The ruptured along fault...
This paper combines the power of deep-learning with generalizability physics-based features, to present an advanced method for seismic discrimination between earthquakes and explosions. The proposed contains two branches: a deep learning branch operating directly on waveforms or spectrograms, second parametric features. These features are high-frequency P/S amplitude ratios difference local magnitude (ML) coda duration (MC). combination achieves better generalization performance when applied...
Abstract The solid inner core, suspended within the liquid outer core and anchored by gravity, has been inferred to rotate relative surface of Earth or change over years decades based on changes in seismograms from repeating earthquakes explosions 1,2 . It a rich structure 3–6 influences pattern convection therefore Earth’s magnetic field. Here we compile 143 distinct pairs earthquakes, many 16 multiplets, built 121 between 1991 2023 South Sandwich Islands. We analyse their...
In the classic microseismic band of 5-20 sec, seismic noise consists mainly fundamental mode Rayleigh and Love waves; however, at shorter periods also contains a significant amount body-wave energy higher surface waves. this study we perform global survey Earth's short-period field with goal quantifying relative contributions these propagation modes. We examined year's worth vertical component data from 18 arrays International Monitoring System that were sited in variety geologic...
Teleseismic short‐period (0.5–5 s) P waves from the 27 February 2010 Chile earthquake ( M w 8.8) are back projected to source region image locations of coherent seismic wave radiation. Several receiver array configurations analyzed using different arrivals, including networks stations in North America ), Japan PKIKP and Europe PP as well a global configuration with broad azimuthal distribution longer‐period (5–20 s). Coherent bursts radiation concentrated below Chilean coastline, along...
Abstract We performed a frequency‐dependent polarization analysis on ambient seismic energy recorded by 1768 USArray Transportable Array (TA) seismometers for the time period of 1 April 2004 through 31 October 2014. The has strong seasonal variations in power and at essentially all stations; however, annual variation is much smaller. One year data sufficient to determine average properties wavefield particular site. dominant double‐frequency (DF) microseism band, defined here as periods 2–10...
Abstract Supershear rupture, in which a fracture's crack tip expansion velocity exceeds the elastic shear wave velocity, has been extensively investigated theoretically and experimentally previously inferred from seismic observations for six continental strike‐slip earthquakes. We find extensive evidence of supershear rupture an oceanic interplate earthquake, 5 January 2013 M w = 7.5 Craig, Alaska earthquake. This asymmetric bilateral occurred on Queen Charlotte Fault, offshore southeastern...
We analyze seismic noise recorded on the 18 short‐period, vertical component seismometers of Yellowknife Seismic Array (YKA). YKA has an aperture 23 km and is sited cratonic lithosphere in area with low cultural noise. These properties make it ideal for studying natural at periods 1–3 s. calculated frequency‐wave number spectra this band over 6,000 time windows that were extracted once per day 17 years (1991–2007). Slowness analysis reveals a rich variety phases originating from distinct...
Abstract The 2013 Bingham Canyon Mine rock avalanches represent one of the largest cumulative landslide events in recorded U.S. history and provide a unique opportunity to test remote analysis techniques for characterization. Here we combine aerial photogrammetry surveying, topographic reconstruction, numerical runout modeling, broadband seismic infrasound data extract salient details dynamics evolution multiphase event. Our results reveal intact source volume 52 Mm 3 , which mobilized two...
Abstract The 13 November 2016 M w 7.8 Kaikoura, New Zealand, earthquake was investigated using teleseismic P waves. Backprojection of high‐frequency waves from two regional arrays shows unilateral rupture at least southwest‐northeast striking faults with an average speed 1.4–1.6 km/s and total duration ~100 s. Guided by these backprojection results, 33 globally distributed low‐frequency were inverted for a finite fault model (FFM) slip. FFM showed evidence several subevents; however, it...
Abstract Power spectral density (PSD) estimates are widely used in seismological studies to characterize background noise conditions, assess instrument performance, and study quasi-stationary signals that difficult observe the time domain. However, these often utilize different processing techniques, each of which can inherently bias resulting PSD estimates. The level smoothing, size data window, method for actually estimating content all have strong influences on statistics. We show...
Abstract The 18 March 2020 M w 5.7 Magna earthquake near Salt Lake City, Utah, offers a rare glimpse into the subsurface geometry of Wasatch fault system—one world's longest active normal faults and major source seismic hazard in northern Utah. We analyze sequence resolve oblique‐normal slip on shallow (30–35°) west‐dipping at ~9‐ to 12‐km depth. Combined with near‐surface geological observations steep dip (~70°), our results support curved, or listric, shape. High‐precision aftershock...
ABSTRACT Seismic waveform data are generally contaminated by noise from various sources. Suppressing this effectively so that the remaining signal of interest can be successfully exploited remains a fundamental problem for seismological community. To date, most common suppression methods have been based on frequency filtering. These methods, however, less effective when and share similar bands. Inspired source separation studies in field music information retrieval (Jansson et al., 2017)...