Imaging Subsurface Crater Deformation using Controlled-Source Electromagnetics: Experimental Design Guidelines With Application to the Odessa TX Meteorite Impact Site

Details Imaging Subsurface Crater Deformation using Controlled-Source Electromagnetics: Experimental Design Guidelines With Application to the Odessa TX Meteorite Impact Site Imaging Subsurface Crater Deformation using Controlled-Source Electromagnetics: Experimental Design Guidelines With Application to the Odessa TX Meteorite Impact Site

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p31a1385h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #P31A-1385

Mathematics

Logic

0545 Modeling (4255), 0644 Numerical Methods, 0684 Transient And Time Domain, 5420 Impact Phenomena, Cratering (6022, 8136), 5794 Instruments And Techniques

Scientific paper

Crater formation by meteorites is a natural geologic process which has occurred throughout the history of our solar system. The crater morphology provides valuable insights into the prevailing geological conditions at the time of the meteorite impact, whether it occurred on Earth, Moon, Mars or other planetary body. Controlled-source electromagnetic geophysical methods provide a noninvasive means of characterizing subsurface structure. Our goal is to provide guidelines for imaging subsurface deformation and inferring the magnitude of the collision, in view of our primary target which is the shape of the deformation. We show that topography must be taken into account when analyzing the controlled-source electromagnetic response. The Texas A&M University (TAMU) finite element code is used to model these effects. Using the code we have run experimental design studies based on the Odessa TX impact crater, with its well-constrained subsurface deformation geometry, as a template. Different parameters are changed to determine the response of possible deformation scenarios. These parameters include the background conductivity, and the width and thickness of the deformation zone. Evaluating a suite of models enables us to determine optimal transmitter and receiver geometries. We have applied the experimental design procedure to study the shape and size of the subsurface deformation at the Odessa meteorite impact site.

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