Warren B. Caldwell Office: Mitchell Building, room 463 Phone: (650) 724-0461 E-mail: wcaldwell [at] stanford [dot] edu   Mail: Department of Geophysics Stanford University 397 Panama Mall Stanford, CA 94305-2215

About Me

Education

Research

I am interested in earthquake seismology as a tool to investigate the tectonics and structure of the lithosphere. My current research is focused on the western Himalaya and Tibetan Plateau, the youngest and highest mountain range on earth.

I am collaborating with colleagues from India's National Geophysical Research Institute, located in Hyderabad. They have been generous in sharing data from two broadband arrays in northern India.

I am working on the following projects:

• Crustal velocity structure in the northwest Himalaya using surface wave dispersion. We have identified a low-velocity layer at 25-40 km depth, a feature consistent with the presence of active channel flow. One-page summary.
• Imaging the Himalayan thrust with teleseismic data. CCP stacking of receiver functions (one page summary) and wave-equation migration of scattered body wave coda.

Shared Data and Results

The following are links to data and results that fellow researchers are welcome to use. I have tried to provide sufficient descriptions of the data to make them useful, but if you run into problems, you can contact me. Please cite (the appropriate references are listed).

• One-dimensional shear-wave velocity profiles in the NW Himalaya (Ladakh).

Publications

1. Warren B. Caldwell, Simon L. Klemperer, Jesse F. Lawrence, Shyam S. Rai, Ashish, 2013, Characterizing the Main Himalayan Thrust in the Garhwal Himalaya, India with receiver function CCP stacking, Earth and Planetary Science Letters, 367, p. 15--27, doi:10.1016/j.epsl.2013.02.009.
2. W.B. Caldwell, S.L. Klemperer, S.S. Rai, and J.F. Lawrence, 2009, Partial melt in the upper-middle crust of the northwest Himalaya revealed by Rayleigh wave dispersion, Tectonophysics, 477(1-2), p. 58-65, doi:10.1016/j.tecto.2009.01.013. Featured in April 2009 Nature Geoscience Research Highlights, doi:10.1038/ngeo497.

Presentations at meetings

1. Geometry of the Main Himalayan Thrust in the Garhwal Himalaya from receiver function CCP stacking. (12.1M) Poster at AGU Fall meeting, December 2012, San Francisco, CA.
2. A Moho ramp imaged beneath the High Himalaya in Garhwal, India. (5.2M) Poster at AGU Fall meeting, December 2011, San Francisco, CA.
3. Thickness of underthrust Indian crust in the Garhwal Himalaya: The role of forward modeling in designing teleseismic imaging experiments. (5.4M) Poster at AGU Fall meeting, December 16, 2010, San Francisco, CA.
4. Receiver function imaging in the western Himalaya. (3.8M) Poster at 25th Himalaya-Karakoram-Tibet Workshop, June 8-10, 2010, San Francisco, CA.
5. Imaging the Himalayan megathrust in northwest India: wave equation migration and receiver function CCP-stacking compared. (2.9M) Poster at AGU Fall meeting, December 17, 2009, San Francisco, CA.
6. Imaging the Himalayan megathrust in northwest India with wave equation migration. (3.0M) Poster at Seismological Society of America Annual Meeting, April 8-10, 2009, Monterey, CA.
7. Crustal Velocity Structure from Surface Wave Dispersion in the Indian Himalaya. (1.0M) Talk at 23rd Himalaya-Karakoram-Tibet Workshop, August 7-11, 2008, Leh, India. Abstract in Himalayan Journal of Sciences.
8. Crustal velocity structure in NW India from surface wave dispersion tomography. (4.3M) Poster at "Hi-CLIMB and Beyond: International Workshop on the Dynamics of Continental Collision," June 12-13, 2008, University of Illinois at Urbana-Champaign.
9. Testing the Presence of Fluids/Crustal Melts in the India-Asia Collision Zone Using Rayleigh Wave Dispersion Analysis. (1.1M) Poster at American Geophysical Union Fall Meeting, December 10-14, 2007, San Francisco, CA.

Field Notes

• Ladakh Himalaya, 2008 (HKT23 Field Trip)

Awards

Graduate Research Fellowship Honorable Mention. National Science Foundation, 2008.

Nelson Fellowship. Stanford University Department of Geophysics, 2007-2009.

Personal Interests

When I'm not at the office, I spend my time in the mountains skiing and climbing. I am also an officer and instructor for the Stanford Alpine Club. Before I started spending my free time in the mountains, I devoted my time outside of school to rowing, as an undergraduate with Princeton Crew and in high school with Green Lake Crew.

Personal page - Click for more about my extracurricular pursuits.