Delwayne R. Bohnenstiehl

Adjunct Associate Research Scientist
Lamont-Doherty Earth Observatory
Marine Geology and Geophysics
Doherty Associate Research Scientist
Lamont-Doherty Earth Observatory
bohnenstiehl.jpg
207C Oceanography
61 Route 9W - PO Box 1000
Palisades
NY
10964-8000
US
Phone: 
(845) 365-8382
Fax: 
(845) 365-8156
Fields of interest: 
Seismotectonic Processes at Mid-Ocean Ridges, Passive Underwater Acoustics

My research is focused on understanding the generation and evolution of young oceanic lithosphere along this planet's mid-ocean ridge spreading centers. Over the last several years, I have been working on problems related to the growth and evolution of extensional fault populations in this environment. Largely, my work has made use of sidescan sonar and bathymetric data to map the distribution of faults at various scales. Through a combination of observational and model-based studies, I continue to evaluate the influence of factors such as spreading rate and magma budget on fault growth and evolution.

To elucidate seismotectonic processes and their impacts on the ridge system, I also have been using arrays of moored hydrophones to detect and locate shallow submarine seismicity. This method takes advantage of the efficiency of oceanic sound propagation to improve event location accuracy and detection thresholds in remote ocean areas. My ongoing work is focused on improving our ability to discriminate volcanic and tectonic earthquake activity and evaluate the dynamic and static stress interactions between earthquakes in mid-ocean ridge settings.

In addition to recording shallow under water earthquakes, hydrophones can detect a variety of other signals, including whale vocalizations, ice sheet movements and explosions. As I continue to passively 'listen' to the oceans, I have become increasingly interested in these aspects of the data. Such interests have lead to a new and exciting group of collaborations

Education
List of degrees from highest to lowest:
Ph.D. Earth and Environmental Sciences
Columbia University, New York, NY
2002
M.S. Geology
Vanderbilt University, Nashville, TN
1998
B.S. Geology
Eastern Illinois University, Charleston, IL
1995
Referenced in the Following News Items: 
Selected Publications: 
Breaking into the plate: A 7.6 Mw fracture-zone earthquake adjacent to the Central Indian Ridge, Bohnenstiehl, D. R.; Tolstoy, M.; Chapp, E. , Geophysical Research Letters, Jan 31, Volume 31, Issue 2, p.-, (2004), Doi 10.1029/2003gl018981

Aftershock sequences in the mid-ocean ridge environment: an analysis using hydroacoustic data, Bohnenstiehl, D. R.; Tolstoy, M.; Dziak, R. P.; Fox, C. G.; Smith, D. K. , Tectonophysics, Aug 30, Volume 354, Issue 1-2, p.49-70, (2002), Pii S0040-1951(02)00289-5

Faulting patterns near 19 degrees 30 ' S on the East Pacific Rise: Fault formation and growth at a superfast spreading center, Bohnenstiehl, D. R.; Carbotte, S. M. , Geochemistry Geophysics Geosystems, Sep 5, Volume 2, p.art. no.-2001GC000156, (2001)

Evidence for spreading-race dependence in the displacement-length ratios of abyssal hill faults at mid-ocean ridges, Bohnenstiehl, D. R.; Kleinrock, M. C. , Geology, May, Volume 28, Issue 5, p.395-398, (2000)