A5074646701- earthquake and tectonic studies
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- Seismology and Earthquake Studies
- Geology and Paleoclimatology Research
- Earthquake Detection and Analysis
- Geochemistry and Geologic Mapping
- Geological and Geophysical Studies
- Maritime and Coastal Archaeology
- Geological Studies and Exploration
- Geological formations and processes
- Geophysics and Sensor Technology
- Geological and Tectonic Studies in Latin America
- Underwater Acoustics Research
- Methane Hydrates and Related Phenomena
- Geological Modeling and Analysis
- Hydrology and Sediment Transport Processes
- Landslides and related hazards
- Hydrocarbon exploration and reservoir analysis
- Arctic and Antarctic ice dynamics
- Drilling and Well Engineering
- Machine Learning in Bioinformatics
- Advanced Wireless Communication Techniques
University of New Mexico
2016-2025
Rice University
2025
ORCID
2020
California Institute of Technology
2012-2019
Macquarie University
2019
University of Oregon
2010-2013
The high water storage capacity of minerals in Earth's mantle transition zone (410- to 660-kilometer depth) implies the possibility a deep H2O reservoir, which could cause dehydration melting vertically flowing mantle. We examined effects downwelling from into lower with high-pressure laboratory experiments, numerical modeling, and seismic P-to-S conversions recorded by dense array North America. In hydrous ringwoodite perovskite (Mg,Fe)O produces intergranular melt. Detections abrupt...
The Yellowstone supervolcano is one of the largest active continental silicic volcanic fields in world. An understanding its properties key to enhancing our knowledge mechanisms and corresponding risk. Using a joint local teleseismic earthquake P-wave seismic inversion, we revealed basaltic lower-crustal magma body that provides magmatic link between mantle plume previously imaged upper-crustal reservoir. This has volume 46,000 cubic kilometers, ~4.5 times reservoir, contains melt fraction...
Mantle seismic structure beneath the United States spanning from active western plate margin to passive eastern was imaged with teleseismic P and S wave traveltime tomography including USArray data up May 2014. To mitigate artifacts crustal 5–40 s, Rayleigh phase velocities were used create a 3-D starting model. Major features of final models include two distinct low-velocity anomalies at depths ~60–300 km central northern Appalachians margin. The Appalachian anomaly coincides Eocene...
The correspondence between seismic velocity anomalies in the crust and mantle differential incision of continental-scale Colorado River system suggests that significant mantle-to-surface interactions can take place deep within continental interiors. Rocky Mountain region exhibits low-seismic-velocity associated with atypically high (and rough) topography, steep normalized river segments, areas greatest incision. Thermochronologic geologic data show regional exhumation accelerated starting...
Research Article| February 01, 2011 Seismically imaged relict slab from the 55 Ma Siletzia accretion to northwest United States Brandon Schmandt; Schmandt Department of Geological Sciences, University Oregon, Eugene, Oregon 97403, USA Search for other works by this author on: GSW Google Scholar Eugene Humphreys Geology (2011) 39 (2): 175–178. https://doi.org/10.1130/G31558.1 Article history received: 09 Jul 2010 rev-recd: 22 Sep accepted: 02 Oct first online: Mar 2017 Cite View This Citation...
Abstract Seismic structure beneath the contiguous U.S. was imaged with multimode receiver function stacking and inversion of Rayleigh wave dispersion ellipticity measurements. Crust thickness elevation are weakly correlated across U.S., but correlation is ~3–4 times greater for separate areas east west Rocky Mountain Front (RMF). Greater lower crustal shear velocities RMF, particularly in low‐elevation thick crust, consistent deep density as primary cause contrasting crust versus trends....
Rayleigh wave ellipticity, or H/V ratio, observed on the surface is particularly sensitive to shallow earth structure. In this study, we jointly invert measurements of ratio and phase velocity between 24–100 8–100 sec period, respectively, for crust upper mantle structure beneath more than 1000 USArray stations covering western United States. Upper crustal structure, in particular, better constrained by joint inversion compared inversions based velocities alone. addition imaging Vs show that...
We present a new 3-D seismic model of the western United States crust derived from joint inversion Rayleigh-wave phase velocity and ellipticity measurements using periods 8 to 100 s. Improved constraints on upper-crustal structure result use short-period ellipticity, or H/V (horizontal vertical) amplitude ratios, determined multicomponent ambient noise cross-correlations. To retain ratio information between vertical horizontal components, for each station, we perform daily pre-processing...
As rivers transport water and sediment across Earth's surface, they radiate elastic acoustic waves. We use seismic infrasound observations during a controlled flood experiment (CFE) in the Grand Canyon to show that three types of fluvial processes can be monitored from outside channel. First, bed‐load under conditions evolving bed mobility is identified as dominant source between 15 45 Hz. Two lower‐frequency bands also excited by CFE exhibited greater power increases are consistent with...
Abstract Seismic body waves that sample Earth's core are indispensable for studying the most remote regions of planet. Traditional phase studies rely on well‐defined earthquake signals, which spatially and temporally limited. We show that, by stacking ambient‐noise cross‐correlations between USArray seismometers, wave phases reflected off outer ( ScS ), twice refracted through inner PKIKP 2 ) can be clearly extracted. Temporal correlation amplitude these global seismicity suggests signals...
Research Article| June 01, 2016 Magma reservoirs from the upper crust to Moho inferred high-resolution Vp and Vs models beneath Mount St. Helens, Washington State, USA Eric Kiser; Kiser 1Department of Earth Science, Rice University, 6100 Main Street, MS-126, Houston, Texas 77005, Search for other works by this author on: GSW Google Scholar Imma Palomeras; Palomeras Alan Levander; Levander Colin Zelt; Zelt Steven Harder; Harder 2Department Geological Sciences, University at El Paso, 500 West...
Abstract Seismicity in the Raton Basin over past two decades suggests reactivation of basement faults due to waste‐water injection. In summer 2018, 96 short period three‐component nodal instruments were installed a highly active region basin for month. A machine‐learning based phase picker (PhaseNet) was adopted and identified millions picks, which associated into events using an automated algorithm—REAL (Rapid Earthquake Association Location). After hypocenter relocation with hypoDD,...
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...
We invert traveltime residuals of teleseismic P and S phases for 3‐D perturbations in V , / structures the southern California upper mantle. The tomographic inversion uses frequency‐dependent sensitivity kernels to interpret measured multiple frequency bands recent advances regional crustal thickness velocity models better isolate mantle component residuals. In addition separate tomography, we jointly data sets by imposing a smoothness constraint on δ ln field. is very heterogeneous with...
Research Article| March 01, 2016 Synchronous opening of the Rio Grande rift along its entire length at 25–10 Ma supported by apatite (U-Th)/He and fission-track thermochronology, evaluation possible driving mechanisms Jason W. Ricketts; Ricketts † 1Department Earth Planetary Sciences, University New Mexico, MSC03-2040, 1 Albuquerque, Mexico 87131, USA †jwrick@unm.edu; jwricketts8@gmail.com Search for other works this author on: GSW Google Scholar Shari A. Kelley; Kelley 2Earth Environmental...
As the Pacific–Farallon spreading center approached North America, Farallon plate fragmented into a number of small plates. Some microplate fragments ceased subducting before reached trench. Most tectonic models have assumed that oceanic slab detached from these microplates close to trench, but recent seismic tomography studies revealed high-velocity anomaly beneath Baja California appears be fossil still attached Guadalupe and Magdalena microplates. Here, using surface wave tomography, we...
Abstract In the summer of 2014 a dense array 904 geophones was deployed at Mount St. Helens along road and trail system within 15 km distance summit crater. The recorded continuous data for approximately 2 weeks presents an unprecedented seismic observation active volcano. A reverse‐time imaging method is applied to short‐term‐average over long‐term‐average time series automatically detect locate microseismicity. These efforts resulted in order magnitude increase earthquake detections normal...
Abstract We investigated upper crustal structure with data from a dense seismic array deployed around Mount St. Helens for 2 weeks in the summer of 2014. Interstation cross correlations ambient noise were obtained, and clear fundamental mode Rayleigh waves observed between 2.5 5 s periods. In addition, higher‐mode signals period. Frequency‐time analysis was applied to measure wave phase velocities, which used invert 2‐D velocity maps. An azimuth‐dependent traveltime correction implemented...
Abstract Mantle shear velocity (Vs) structure beneath the Transportable Array (TA) in Alaska and northwestern Canada is imaged by joint inversion of Rayleigh wave dispersion teleseismic S travel times. The study connects previously unsampled parts northern western with portions southern earlier seismic arrays. new Vs tomography shows contrasting lithospheric plate interior lower shallow upper mantle indicative thinner thermal lithosphere south Brooks Range along transform margin. Higher down...
Research Article| July 12, 2018 Seismically anisotropic magma reservoirs underlying silicic calderas Chengxin Jiang; Jiang 1Department of Earth and Planetary Sciences, The University New Mexico, Albuquerque, Mexico 87131, USA Search for other works by this author on: GSW Google Scholar Brandon Schmandt; Schmandt Jamie Farrell; Farrell 2Department Geology Geophysics, Utah, Salt Lake City, Utah 84112, Fan-Chi Lin; Lin Kevin M. Ward Author Article Information Publisher: Geological Society...