A. Levander
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View article: Validation of <i>Ps‐P</i> Tomography for Obtaining 3D Crustal <i>V</i><sub><i>P</i></sub><i>/V</i><sub><i>S</i></sub> With Small‐<i>N</i> Data Sets: An Application to the Mount St. Helens Magmatic System
Validation of <i>Ps‐P</i> Tomography for Obtaining 3D Crustal <i>V</i><sub><i>P</i></sub><i>/V</i><sub><i>S</i></sub> With Small‐<i>N</i> Data Sets: An Application to the Mount St. Helens Magmatic System Open
The high sensitivity of V P /V S to the presence of melt makes images of V P /V S structure particularly useful in magmatic systems, but detailed three‐dimensional models of V P /V S structure in magmatic systems are often restricted to th…
View article: 3D Shear Velocity Structure of the Caribbean—Northwestern South America Subduction Zone From Ambient Noise and Ballistic Rayleigh Wave Tomography
3D Shear Velocity Structure of the Caribbean—Northwestern South America Subduction Zone From Ambient Noise and Ballistic Rayleigh Wave Tomography Open
The Caribbean‐South America subduction zone is a flat subduction zone, with Laramide‐style thick‐skinned uplifts occurring in the Merida Andes, Sierra de Perija Range, and Santa Marta Massif. Geodetic measurements and historical seismicity…
View article: Seismic Autocorrelation Analysis of Deep Mars
Seismic Autocorrelation Analysis of Deep Mars Open
The InSight mission deployed one seismic station on Mars, providing a chance to apply single‐station‐based autocorrelation analysis to investigate Martian subsurface structures. However, recent analysis indicated the low‐frequency autocorr…
View article: The rise of the academic science humble brag
The rise of the academic science humble brag Open
One of the lesser admitted realities of academia is the need to promote one’s successes in order to curate a reputation to increase the chances of funding, promotion, and publication. This has led to the unfortunate emergence of well-inten…
View article: Insights on Formation of the Gulf of Mexico by Rayleigh Surface Wave Imaging
Insights on Formation of the Gulf of Mexico by Rayleigh Surface Wave Imaging Open
We used cross‐correlation of ambient noise records from seismic stations in the US, Mexico, and Cuba to extract dispersion data of Rayleigh surface wave. Our derived 3D shear‐wave velocity model of the greater Gulf of Mexico (GOM) region c…
View article: Autocorrelation R<sub>2</sub> on Mars
Autocorrelation R<sub>2</sub> on Mars Open
A purpose of the Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport (InSight) mission is to reveal the Martian interior structure with seismic data. In this work, ambient noise autocorrelation of the continuously…
View article: Potential Pitfalls in the Analysis and Structural Interpretation of Seismic Data from the Mars <i>InSight</i> Mission
Potential Pitfalls in the Analysis and Structural Interpretation of Seismic Data from the Mars <i>InSight</i> Mission Open
The Seismic Experiment for Interior Structure (SEIS) of the InSight mission to Mars has been providing direct information on Martian interior structure and dynamics of that planet since it landed. Compared with seismic recordings on the Ea…
View article: Caribbean Slab Segmentation Beneath Northwest South America Revealed by 3‐D Finite Frequency Teleseismic P‐Wave Tomography
Caribbean Slab Segmentation Beneath Northwest South America Revealed by 3‐D Finite Frequency Teleseismic P‐Wave Tomography Open
The Caribbean plate subducts beneath northwest South America at a shallow angle due to a large igneous province that added up to 12 km of buoyant crust. The overriding plate lacks volcanism and exhibits Laramide‐style uplifts over 500 km f…
View article: 3D shear velocity structure of the northwestern South America-Caribbean Subduction Zone from ambient noise and ballistic Rayleigh wave tomography
3D shear velocity structure of the northwestern South America-Caribbean Subduction Zone from ambient noise and ballistic Rayleigh wave tomography Open
<p>The Caribbean plate (CAR) collided with and initiated subduction beneath northwestern South America (SA) at about 60-55 Ma. Since the onset of subduction, it has formed the Lara nappes and subsequently the Laramide-style uplifts o…
View article: Crustal and lithospheric architecture of the Gulf of Mexico and its continental margins from ambient noise Rayleigh wave tomography
Crustal and lithospheric architecture of the Gulf of Mexico and its continental margins from ambient noise Rayleigh wave tomography Open
<p>The Gulf of Mexico formed as a result of continental breakup between the North and SouthAmerican plates and a short period of seafloor spreading in the Late Jurassic-Early Cretaceous. This small ocean basin offers an opportunity t…
View article: Caribbean slab dynamics beneath northwest South America from SKS and Local S splitting
Caribbean slab dynamics beneath northwest South America from SKS and Local S splitting Open
<p>&#160; &#160; &#160;The southernmost edge of the Caribbean (CAR) plate, a buoyant large igneous province, subducts shallowly beneath northwestern South America (NWSA) at a trench that lies northwest of Colombia. Recent…
View article: Seismic Evidence of Bottom‐Up Crustal Control on Volcanism and Magma Storage Near Mount St. Helens
Seismic Evidence of Bottom‐Up Crustal Control on Volcanism and Magma Storage Near Mount St. Helens Open
The lower crust has long been recognized as a place where significant chemical evolution of magma occurs. Understanding the conditions that lead to long‐term storage in or rapid transport through these lower crustal systems has remained a …
View article: Daily changes of seismic velocities in shallow materials on Mars
Daily changes of seismic velocities in shallow materials on Mars Open
Temporal changes of S-wave velocities at shallow depth on Mars are derived using seismic data from the InSight mission. Autocorrelation functions are computed for three-component seismic recordings to retrieve zero-offset reflection seismo…
View article: iMUSH Autocorrelation Reflectivity and Active Seismic Imaging of the Magma Plumbing System under Mount St Helens, Washington, USA
iMUSH Autocorrelation Reflectivity and Active Seismic Imaging of the Magma Plumbing System under Mount St Helens, Washington, USA Open
<p>We have developed a 3D model of the Mount St Helens (MSH) magmatic plumbing system extending from the upper magma storage zone (> 3.5 km bsl) to Moho depths (40-45 km) by combining results from 2D and 3D active source seismic t…
View article: Constraining Crustal Properties Using Receiver Functions and the Autocorrelation of Earthquake‐Generated Body Waves
Constraining Crustal Properties Using Receiver Functions and the Autocorrelation of Earthquake‐Generated Body Waves Open
Passive seismic methods for imaging the discontinuity structure of Earth have primarily focused on differences in vertically and radially polarized energy in the coda of earthquake‐generated body waves (e.g., receiver functions). To conver…
View article: Upper Crustal Structure and Magmatism in Southwest Washington: <i>V</i><sub><i>p</i></sub>, <i>V</i><sub><i>s</i></sub>, and <i>V</i><sub><i>p</i></sub>/<i>V</i><sub><i>s</i></sub> Results From the iMUSH Active‐Source Seismic Experiment
Upper Crustal Structure and Magmatism in Southwest Washington: <i>V</i><sub><i>p</i></sub>, <i>V</i><sub><i>s</i></sub>, and <i>V</i><sub><i>p</i></sub>/<i>V</i><sub><i>s</i></sub> Results From the iMUSH Active‐Source Seismic Experiment Open
Structural details of the crust play an important role in controlling the distribution of volcanic activity in arc systems. In southwest Washington, several different regional structures associated with accretion and magmatism have been in…
View article: Lithospheric structure of<scp>I</scp>beria and<scp>M</scp>orocco using finite‐frequency<scp>R</scp>ayleigh wave tomography from earthquakes and seismic ambient noise
Lithospheric structure of<span>I</span>beria and<span>M</span>orocco using finite‐frequency<span>R</span>ayleigh wave tomography from earthquakes and seismic ambient noise Open
We present a new 3‐D shear velocity model of the western Mediterranean from the Pyrenees, Spain, to the Atlas Mountains, Morocco, and the estimated crustal and lithospheric thickness. The velocity model shows different crustal and lithosph…
View article: Magma reservoirs from the upper crust to the Moho inferred from high-resolution Vp and Vs models beneath Mount St. Helens, Washington State, USA
Magma reservoirs from the upper crust to the Moho inferred from high-resolution Vp and Vs models beneath Mount St. Helens, Washington State, USA Open
[EN]The size, frequency, and intensity of volcanic eruptions are strongly controlled by the volume and connectivity of magma within the crust. Several geophysical and geochemical studies have produced a comprehensive model of the magmatic …
View article: Lithospheric structure of the westernmost Mediterranean inferred from finite frequency Rayleigh wave tomography S-velocity model.
Lithospheric structure of the westernmost Mediterranean inferred from finite frequency Rayleigh wave tomography S-velocity model. Open
The Iberian Peninsula and Morocco, separated by the Alboran Sea and the Algerian Basin, constitute the westernmost Mediterranean. From north to south this region consists of the Pyrenees, the result of interaction between the Iberian and E…
View article: From the Surface Topography to the Upper Mantle, Seismic constraints on the Crustal structure Across Morocco
From the Surface Topography to the Upper Mantle, Seismic constraints on the Crustal structure Across Morocco Open
The most characteristic topographic features of Morocco are the Atlas Mountains and the Rif Coordillera. These two orogenic belts are the response of different geodynamic processes acting at lithospheric scale caused by a unique driver, th…
View article: 3D Seismic Experimentation and Advanced Processing/Inversion Development for Investigations of the Shallow Subsurface
3D Seismic Experimentation and Advanced Processing/Inversion Development for Investigations of the Shallow Subsurface Open
The work plan for this project was to develop and apply advanced seismic reflection and wide-angle processing and inversion techniques to high resolution seismic data for the shallow subsurface to seismically characterize the shallow subsu…