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Occam's Inversion
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WHAM: Web Hosted Active-source Modeling

January 2010 - new version of WHAM that uses the Dipole1D code and the Google charts API.

WHAM is an online tool for 1D controlled-source electromagnetic (CSEM) modeling. Just specify a few parameters and with the click of a button, WHAM will output CSEM response plots in your browser window. WHAM also provides links where you can download the raw CSEM response data files. We hope that you will find WHAM to be a helpful tool for quick and easy CSEM modeling.

WHAM is built around the open-source modeling code Dipole1D (Key, 2009). WHAM currently supports modeling of the frequency domain EM fields produced by an electric dipole transmitter located anywhere in a stack of 1D layers. WHAM computes the responses for the commonly collected inline transmitter geometry and also the less commonly collected broadside and vertical transmitter orientations. Receivers are located in a linear horizontal array that extends from the transmitter to an user specified distance away. WHAM plots the CSEM responses of the non-zero components of the inline, crossline and vertical electric and magnetic fields associated with each transmitter geometry. Because single CSEM responses are difficult to interpret alone, WHAM allows you to specify two conductivity models so that their respective CSEM responses can be easily compared. WHAM will also create amplitude and phase anomaly plots between the two model responses.

This work has been made possible by the Seafloor Electromagnetic Methods Consortium at Scripps Institution of Oceanography. If you find WHAM useful and your company is not already a member of the SEMC, please consider supporting our continued research, software development, and student training in marine EM methods by joining the SEMC.

You are free to use WHAM for your 1D CSEM modeling needs. However, we request that presentations using results from WHAM include an acknowledgment to the "Marine EM Laboratory at Scripps Institution of Oceanography". If you publish results from WHAM in a technical journal, please cite my paper on the Dipole1D modeling code, which is the numerical engine hidden behind WHAM's web interface:

Key, K., 2009, 1D inversion of multicomponent, multifrequency marine CSEM data: Methodology and synthetic studies for resolving thin resistive layers: Geophysics, 74, F9-F20.


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Last updated: Thursday, 21-Jan-2010 20:17:56 PST
email: kkey@ucsd.edu