About SPUD

SPUD Version 3.0

The Searchable Product Depository (SPUD) is the IRIS DMC's primary data product management system. Complementing the DMC's SEED and assembled data archives, which contain time series recordings, the SPUD system primarily contains derivative data products of other types (images, movies, etc.) created either at the DMC or by members of the community.

For users SPUD is the query and access point for these products. The web interfaces allow users to search for products using customized queries across product and event details. Users can search across all product types at once or within specific product types. SPUD also has web service interfaces for programmatic discovery and access to the data products.

If any products from SPUD are used in your research please be sure to cite the identified author of the product and the IRIS DMS [Citation Information].

About EM_TF Products

The EMTF data product contains magnetotelluric (MT) transfer functions (TFs), which define the frequency dependent linear relationship between components of electromagnetic (EM) field variations measured at a single site. Two sorts of TF are provided for most sites: 2x2 impedance tensors, and vertical field TFs, which respectively relate horizontal electric and vertical magnetic components (the outputs in the TF relationship) to the horizontal magnetic field vectors (the corresponding inputs).

Note that for some sites only impedances are provided. All of the TFs, which can be justified if external source fields are quasi-uniform (varying over length scales that are long compared to the skin depth), provide input data for subsequent MT inversion and interpretation. They are estimated from the raw EM time series by (a) Fourier transforming data in a series of short overlapping time windows, and (b) applying robust regression methods to the resulting sequence of Fourier coefficients. For remote reference estimates data from a second site are used for noise cancellation, and to reduce bias due to noise in the predicting magnetic channels. Apparent resistivities and phases, which can be computed from the off-diagonal components of the impedance tensors, are frequently used in 2D interpretations. The EMTF data product includes estimates of the TFs for a range of periods (which may vary, depending on instrumentation and deployment time), as well as estimation error covariances.

Citing EM_TF Products

When citing this particular Magnetotelluric Transfer Function, please cite based on the "Citation Info" panel of this page. To cite the Magnetotelluric Transfer Function database at IRIS, please use the instructions at:

http://ds.iris.edu/ds/products/emtf/#citation


EM TF Help

The page displays information for individual Electromagnetic Transfer Functions.

The Transfer Function details are displayed in panels by default and optionally the XML may be viewed in the browser.
Magnetotelluric Transfer Functions (Inactive) icon
Identification
Status: Inactive
Sub Type: MT_TF
Description: Magnetotelluric Transfer Functions
Product ID: Argentina.PA865.2004-2008
Tags: impedance,tipper


Citation Info
Survey Reference: Booker,J., Pomposiello,C., Favetto,A., Burd,A.I., Giordanengo, G., de Luchi, MGL, Orozco, L.A. and Rossello, E. (2004-2008). "Magnetotelluric Transfer Functions in central Argentina". doi:10.17611/DP/EMTF/ARGENTINA/PAM. Retrieved from the IRIS database on Oct 02, 2025
Specific Site Reference: Booker,J., Pomposiello,C., Favetto,A., Burd,A.I., Giordanengo, G., de Luchi, MGL, Orozco, L.A. and Rossello, E. (2004-2008). "Magnetotelluric Transfer Functions in central Argentina: PA865". doi:10.17611/DP/14165225. Retrieved from the IRIS database on Oct 02, 2025
Acknowledgements: The project was supported by US National Science Foundation, National Agency for Promotion of Science and Technology( Agencia Nacional de Promocion Cientifica y Tecnologica), Argentina and Council for Scientific and Technical Research (CONICET) NSF Grants for EMSOC Facility that supplied NIMS: EAR 9616421; EAR 0236538 NSF grants for fieldwork in Argentina (includes LIMS/NIMS prior to EMSOC Facility): EAR 9614590; EAR 9909390; EAR 0310113; EAR 0739116 National Agency for Promotion of Science and Technology PICT 97: 07-00000-01372; PICT 99: 07-06316; PICT 2005: Number 38353 Council for Scientific and Technical Research (CONICET): PIP: 4508; PIP: D703, 2011
Selected Publications: Orozco, L.A., Favetto, A., Pomposiello, C., Rossello, E., Booker, J.. "Crustal deformation of the Andean foreland at 31 degrees 30 seconds S (Argentina) constrained by magnetotelluric survey.," Tectonophysics, v.582, 2013, p. 126. Burd, A.I., Booker, J.R., Mackie, R., Pomposiello, C. and Favetto, A.. "Electrical conductivity of the Pampean shallow subduction region of Argentina near 33 S: Evidence for a slab window," Geochemistry, Geophysics, Geosystems, v.14, 2013. doi:10.1002/ggge.20213 Favetto, A; Pomposiello, C; de Luchi, MGL; Booker, J. "2D Magnetotelluric interpretation of the crust electrical resistivity across the Pampean terrane-Rio de la Plata suture, in central Argentina," TECTONOPHYSICS, v.459, 2008, p. 54. View record at Web of Science doi:10.1016/j.tecto.2007.11.07
Release Status: Unrestricted Release
Conditions of Use: All data and metadata for this survey are available free of charge and may be copied freely, duplicated and further distributed provided that this data set is cited as the reference, and that the author(s) contributions are acknowledged as detailed in the Acknowledgements. Any papers cited in this file are only for reference. There is no requirement to cite these papers when the data are used. Whenever possible, we ask that the author(s) are notified prior to any publication that makes use of these data. While the author(s) strive to provide data and metadata of best possible quality, neither the author(s) of this data set, nor IRIS make any claims, promises, or guarantees about the accuracy, completeness, or adequacy of this information, and expressly disclaim liability for errors and omissions in the contents of this file. Guidelines about the quality or limitations of the data and metadata, as obtained from the author(s), are included for informational purposes only.
Site Info
Project: Argentina
Survey: Sierras de Cordoba
Year Collected: 2004-2008
ID: PA865
Name: Sierras de Cordoba, Argentina
Elevation: 91.3
Latitude: -31.866
Longitude: -59.687
Declination: -6.4
Declination Epoch: 1995.0
Orientation:
Angle To GG North: Unknown
Release Status: Unrestricted Release
Acquired By: John Booker
Data Quality Rating: 5
Data Quality Comments: Unrated
Runlist: PA8655 PA865r PA8658 PA8658 PA8650
Start Date: 2004-06-01 00:00:00
End Date: 2004-06-01 00:00:00
Processing Info
Input Channels
Output Channels
Data
Attachments
Contributions