California Institute of Technology
Seismological Laboratory Division of Geological and Planetary Sciences


Justin Ko

Justin Ko

Post Doctoral Scholar in Geophysics

Ph.D., 2014, Geosciences, National Taiwan University, Taiwan

California Institute of Technology
Seismological Laboratory
1200 E. California Blvd., MS 252-21
So. Mudd Building, Rm 268
Pasadena, CA 91125

Phone: (626) 395-3861
Fax: (626) 564-0715


I am interested in source characteristics and the mantle structure in the earth interior. Much of my previous work has focused on characterizations of subduction zone earthquakes, intrinsic attenuation of structures, and the deep mantle heterogeneity. We have found a salient trend of increasing source parameters with increasing depth of subduction zone events, a high Q mantle wedge at the western edge of the Ryukyu subduction zone, and an east-west trending, asymmetric V-shaped undulation of D” topography strongly correlated with shear velocity anomalies within the D” layer. Now we exploit the newly developed numerical method with various mantle heterogeneity models to better understand the possible geophysical features producing the seismic anomalies observed from USArray data.