Entries by Laurence Yeung

JGR-Solid Earth: Upper Crustal Structure and Magmatism in Southwest Washington: Vp, Vs, and Vp/Vs Results From the iMUSH Active‐Source Seismic Experiment

Eric Kiser, Alan Levander, Colin Zelt, Brandon Schmandt, and Steven Hansen J. Geophys. Res.-Solid Earth 124 (2019) 7067-7080. 10.1029/2018JB016203 Abstract 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 invoked to […]

GRL: Constraining crustal properties using receiver functions and the autocorrelation of earthquake‐generated body waves

Jonathan Delph, Fenglin Niu, and Alan Levander Geophys. Res. Lett. (2019) 10.1029/2019JB017929 Abstract 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 convert the timing of scattered wave arrivals to depth, 3 parameters […]

Nature: Isotopic constraint on the twentieth-century increase in tropospheric ozone

  Isotopic constraint on the twentieth-century increase in tropospheric ozone Laurence Y. Yeung, Lee. T. Murray, Patricia Martinerie, Emmanuel Witrant, Huanting Hu, Asmita Banerjee, Anaïs Orsi & Jérôme Chappellaz Nature 570 (2019) 224-227 Abstract Tropospheric ozone (O3) is a key component of air pollution and an important anthropogenic greenhouse gas. During the twentieth century, the proliferation […]

PNAS: Climate models can correctly simulate the continuum of global-average temperature variability

Feng Zhu, Julien Emile-Geay, Nicholas P. McKay, Gregory J. Hakim, Deborah Khider, Toby R. Ault, Eric J. Steig, Sylvia Dee, and James W. Kirchner Proc. Natl. Acad. Sci. USA 116 (2019) 8728-8733. DOI: 10.1073/pnas.1809959116 Significance Climate models are foundational to formulations of climate policy and must successfully reproduce key features of the climate system. The […]

QSR: Evidence of Ice Age humans in eastern Beringia suggests early migration to North America

Richard S. Vachula, Yongsong Huang, William M. Longo, Sylvia G. Dee, William C. Daniels, and James M. Russell Quant. Sci. Rev. 205 (2019) 35-44. DOI: 10.1016/j.quascirev.2018.12.003   Abstract Our understanding of the timing and pathway of human arrival to the Americas remains an important and polarizing topic of debate in archaeology and anthropology. Traditional consensus, […]

JAS: Quantifying the Annular Mode Dynamics in an Idealized Atmosphere

Pedram Hassanzadeh and Zhiming Kuang J. Atmos. Sci. 76 (2019) 1107-1124. DOI: 10.1175/JAS-D-18-0268.1 Abstract The linear response function (LRF) of an idealized GCM, the dry dynamical core with Held–Suarez physics, is used to accurately compute how eddy momentum and heat fluxes change in response to the zonal wind and temperature anomalies of the annular mode […]

G-Cubed: Bubble Coalescence and Percolation Threshold in Expanding Rhyolitic Magma

Thomas Giachetti, Helge M. Gonnermann, James E. Gardner, Alain Burgisser, Sahand Hajimirza, Tobias C. Earley, Nathan Truong, and Pamela Toledo Geochem. Geophys. Geosyst. 20 (2019) 1054-1074. DOI: 10.1029/2018GC008006 Abstract Coalescence during bubble nucleation and growth in crystal‐free rhyolitic melt was experimentally investigated, and the percolation threshold, defined as the porosity at which the vesicular melt first becomes […]

JGR-Solid Earth: Predicting Homogeneous Bubble Nucleation in Rhyolite

Sahand Hajimirza, Helge M. Gonnermann, James E. Gardner, and Thomas Giachetti J. Geophys. Res.-Solid Earth 124 (2019) 2395-2416. DOI: 10.1029/2018JB015891 Abstract Bubble nucleation is the critical first step during magma degassing. The resultant number density of bubbles provides a record of nucleation kinetics and underlying eruptive conditions. The rate of bubble nucleation is strongly dependent […]

Nature Geoscience: Seismic velocity reduction and accelerated recovery due to earthquakes on the Longmenshan fault

Shunping Pei, Fenglin Niu, Yehuda Ben-Zion, Quan Sun, Yanbin Liu, Xiaotian Xue, Jinrong Su, and Zhigang Shao Nature Geosci. 12 (2019) 387-392. DOI: 10.1038/s41561-019-0347-1 Abstract Various studies report on temporal changes of seismic velocities in the crust and attempt to relate the observations to changes of stress and material properties around faults. Although there are […]

GRL: Precursory Stress Changes and Fault Dilation Lead to Fault Rupture: Insights From Discrete Element Simulations

David G. Blank and Julia K. Morgan Geophys. Res. Lett. 46 (2019) 3180-3188. DOI: 10.1029/2018GL081007 Abstract We use the discrete element method to create numerical analogs to subduction megathrusts with natural roughness and heterogeneous fault friction. Boundary conditions simulate tectonic loading, inducing fault slip. Intermittently, slip develops into complex rupture events that include foreshocks, mainshocks, […]