A5059098644- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Geological and Geochemical Analysis
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Geological and Tectonic Studies in Latin America
- Geophysical Methods and Applications
- Seismology and Earthquake Studies
- Geological and Geophysical Studies Worldwide
- Geology and Paleoclimatology Research
- Geophysical and Geoelectrical Methods
- Geological formations and processes
- Medical Imaging Techniques and Applications
- Geological Studies and Exploration
- Paleontology and Stratigraphy of Fossils
- Non-Destructive Testing Techniques
- Underwater Acoustics Research
- Magnetic Properties and Applications
- Geochemistry and Geologic Mapping
- Reservoir Engineering and Simulation Methods
- Hydrocarbon exploration and reservoir analysis
- Electromagnetic Simulation and Numerical Methods
- Geological Modeling and Analysis
The University of Texas at Austin
2015-2024
Amazon (United States)
2024
Institute of Geophysics
2019-2020
University of Texas Institute for Geophysics
2016-2019
Oceanography Society
2018
Scripps Institution of Oceanography
2012-2016
University of California, San Diego
2012-2016
Institut de physique du globe de Paris
2008-2014
Université Paris Cité
2014
Centre National de la Recherche Scientifique
2014
Volcano monitoring goes into the deep Axial Seamount is a large and active submarine volcano along Juan de Fuca midocean ridge off coast of western United States. Eruptions in 1998 2011 were followed by periods magma recharge, making it an ideal location to include Ocean Observatories Initiative Cabled Array. Wilcock et al. present real-time seismic data from most recent eruption April 2015 that allow tracking before during eruption. Nooner Chadwick show eruptions are predictable on basis...
Research Article| August 01, 2014 Anatomy of an active submarine volcano A.F. Arnulf; Arnulf 1Cecil H. and Ida M. Green Institute Geophysics Planetary Physics, Scripps Institution Oceanography, University California–San Diego, La Jolla, California 92093, USA Search for other works by this author on: GSW Google Scholar A.J. Harding; Harding G.M. Kent; Kent 2Nevada Seismological Laboratory, 0174, Nevada–Reno, Reno, Nevada 89557, S.M. Carbotte; Carbotte 3Lamont-Doherty Earth Observatory,...
The magmatic upper crust is generally divided into Layer 2A and 2B, where interpreted to consist of lava flows 2B dikes, although hydrothermal alteration processes have also been suggested define the 2A/2B boundary. Using 3D seismic reflection method at Axial Volcano in Eastern Pacific, we recently imaged > 3 km layered that dip inwards towards rift zone interact with axial melt lens, hence indicating absence a dike sequence. These images show injection sills within pile. However,...
[1] We present a high-resolution 3D seismic image beneath the Lucky Strike volcano on Mid-Atlantic Ridge using streamer tomography. To obtain ray coverage in layer 2A, we first downward continue multichannel (MCS) data close to seafloor generating synthetic ocean bottom experiment (SOBE) and then apply travel-time find that upper crust is laterally heterogeneous 2–3 km scale, with unusually low velocities (1.8–2.2 km.s−1) few hundred meters volcanic edifices, but normal 2A (2.2–3.0 lava...
Abstract Axial Seamount is the most volcanically active site of northeast Pacific, and it has been monitored with a growing set observations sensors during last two decades. Accurate imaging internal structure volcanic systems critical to better understand magma storage processes quantify mass energy transport mechanisms in crust. To improve three‐dimensional velocity Seamount, we combined 469,891 new traveltime arrivals, from 12 downward extrapolated seismic profiles, 3,962 existing...
Abstract Magmatic systems are composed of melt accumulations and crystal mush that evolve with transport, contributing to igneous processes, volcano dynamics, eruption triggering. Geophysical studies active volcanoes have revealed details shallow-level reservoirs, but little is known about fine-scale distribution at deeper levels dominated by mush. Here, we present new seismic reflection images from Axial Seamount, northeastern Pacific Ocean, revealing a 3–5-km-wide conduit vertically...
Abstract The south central Chilean margin regularly produces many of the world's largest earthquakes and tsunami, including 2010 Mw 8.8 Maule 1960 9.5 Valdivia events. In 2017, we acquired seismic reflection data along ~1,000 km using R/V Langseth 's 15 long receiver array 108.2 l (6,600 in 3 ) source to image structures associated with these ruptures. We focus on segment coseismic slip (~40 m). outer 40 forearc is an accretionary wedge constructed primarily stacked sedimentary packages...
Abstract Marine multichannel and wide‐angle seismic data constrain crustal structure along a 530 km margin‐parallel transect of the Hikurangi subduction zone. The subducting Plateau crust ( V P 5.0–7.4 km/s) is ∼1 thicker (11 ± 1 km) mantle velocities are ∼0.2 km/s higher 8.3–8.5 beneath south/central relative to north Hikurangi. In overthrusting plate, an abrupt 0.5 south‐to‐north reduction in forearc wavespeeds occurs concert with change reflection character. We analyze legacy show that...
Seismic full waveform is an emerging technique for determining the fine-scale velocity structure of subsurface. Here, we present results elastic inversion (FWI) along three multichannel seismic lines at Lucky Strike volcano on Mid-Atlantic ridge that provides a image upper oceanic crust with unprecedented resolution (50–100 m). We have used two-step process combining downward continuation time-domain, FWI. The procedure enhances refracted arrivals and wide-angle reflections, reduces...
Abstract Exploring the structure of convergent margins is key to understanding megathrust slip behavior and tsunami generation. We present new wide‐angle marine multichannel seismic data that constrain crustal accretion dynamics northern Hikurangi margin. The top basement Plateau overlain by a rough, 2–3 km thick layer volcanic cover with P‐ wave velocities ( V P ) between 3 5 km/s. This contributes significantly reflectivity beneath shallow subduction plate boundary. frontal prism varies...
Abstract Recent multi‐channel seismic studies of fast spreading and hot‐spot influenced mid‐ocean ridges reveal magma bodies located beneath the mid‐crustal Axial Magma Lens (AML), embedded within underlying crustal mush zone. We here present new images from Juan de Fuca Ridge that show reflections interpreted to be vertically stacked lenses in a number locations this intermediate‐spreading ridge. The brightest are Northern Symmetric segment, ∼46°42′‐52′N Split Seamount, where small body at...
We present a fine‐scale 2D velocity structure beneath the Lucky Strike Volcano on Mid‐Atlantic Ridge (MAR) using an elastic full waveform inversion (FWI) method. The FWI is data driven procedure that allows simultaneous exploitation of both reflections and refractions energy in multi‐channel seismic to create single self‐consistent, high‐resolution image upper crust can be used for geologic interpretation. long‐wavelength background P‐wave model required by local optimization approach was...
Abstract Seismic full waveform inversion (FWI) is a promising method for determining the detailed velocity structure of igneous oceanic crust, especially locations such as Mid‐Atlantic Ridge with significant lateral heterogeneity and seafloor topography. We examine accuracy FWI by inverting, after downward continuation to datum just above seafloor, multichannel seismic (MCS) profile from Atlantis Massif core complex at 30°N that passes close Integrated Ocean Drilling Program (IODP) Hole...
The shallow velocity structure of the Lucky Strike segment Mid-Atlantic Ridge is investigated using seismic refraction and reflection techniques applied to downward continued multichannel streamer data. We present a three-dimensional model beneath Volcano with unprecedented spatial resolutions few hundred meters. These new constraints reveal large lateral variations in P wave this feature. Throughout study area, uppermost crustal velocities are significantly lower than those inferred from...
Abstract Two‐decades of onshore‐offshore, ocean‐bottom seismometer, and passive‐source data are integrated to obtain high‐resolution 3‐D constraints on the architecture Nankai subduction zone. Our model reveals large along‐strike variability in width outer‐forearc, with crustal backstop ( V P ≥ 5 km/s) extending within 50 km Trough offshore Tokai Kii Peninsula, but is a factor 2 further landward (90–115 km) Cape Muroto Kyushu. The broadly coincides down‐dip extent shallow slow‐earthquakes...
Abstract The crustal structure at fast spreading ridges is characterized by the presence of an axial melt lens along a significant part ridge axis over partially molten lower crust. Using three‐dimensional seismic reflection data and waveform inversion, here we show existence two to three stacked lenses beneath both limbs 9°N overlapping center on East Pacific Rise, which suggest are source very evolved lavas locally observed seafloor. 2–4 km wide lie in 900 m depth range. We that complex...
Abstract P ‐to‐ S ‐converted waves observed in controlled‐source multicomponent ocean bottom seismometer (OBS) records were used to derive the Vp / Vs structure of Cascadia Basin sediments. We converted at basement an empirical function describing average sediments as a sediment thickness. derived one‐dimensional interval functions from semblance velocity analysis intrasediment and reflections, which we define versus burial depth compaction trend. find that seaward deformation front,...
Abstract The architecture of magma plumbing systems plays a fundamental role in volcano eruption and evolution. However, the precise configuration crustal reservoirs conduits responsible for supplying eruptions are difficult to explore across most active volcanic systems. Consequently, our understanding their correlation with dynamics is limited. Axial Seamount an submarine located along Juan de Fuca Ridge, known 1998, 2011, 2015. Here we present high-resolution images P-wave velocity,...
Abstract Axial Seamount is a prominent volcano located at the intersection of Juan de Fuca Ridge and Cobb‐Eickelberg hot spot in northeast Pacific Ocean that has erupted 1998, 2011, 2015. The 2015 eruption was recorded by seven‐station seismic network southern part summit caldera forms Observatories Initiative Cabled Array. We utilize data set ~3,900 well‐recorded earthquakes from January to February 2017 three‐dimensional P wave velocity model obtained previously active source conduct joint...
Abstract Relationships between extensional tectonics and magmatism are ubiquitous in continental rifts oceanic spreading centers. Yet few studies document interactions faults mantle melts volcanic arcs. We constrain the crustal structure of offshore Taupo Volcanic Zone (TVZ) from a marine multichannel wide‐angle seismic experiment. The TVZ crust thins >26 km to ∼18–19 across ∼50 Bay Plenty. Elevated P wave velocities lower indicate mafic additions. Magmatic sills 4‐ 15‐km depth lie...