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 EMTF 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.

Product Query Help

This page queries for EM Transfer Function products.

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


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EM Transfer Function Query Parameters
Data Quality
NA
1
2
3
4
5
Data Quality Warning
NA
0
1
Release Status
Academic Use Only
Conditions Apply
Paper Citation Required
Unrestricted Release
Project
Argentina
CAFE-MT
EMSOC
EPOS-PL
Ethiopia
FU-BERLIN
GeoscienceAustralia
INTERMAGNET
Lithoprobe
MAGIC
Mines
MOCHA
NRCAN-GSC
PRIDE
SAGE
SAMTEX
UCL
UofAdelaide
UofAlberta
UofUtah
USArray
USGS-GEOMAG
USGS-GGGSC
USMTArray
UW
YSRP
YuzawaSGR
Periods
10-5 - 10-4
10-4 - 10-3
10-3 - 10-2
10-2 - 10-1
10-1 - 1
1 - 10
10 - 102
102 - 103
103 - 104
104 - 105
Data Quality
Quality Warning
Release Status
Project
Min Period
Max Period
  • All
  • Argentina
  • CAFE-MT
  • EMSOC
  • EPOS-PL
  • Ethiopia
  • FU-BERLIN
  • GeoscienceAustralia
  • INTERMAGNET
  • Lithoprobe
  • MAGIC
  • Mines
  • MOCHA
  • NRCAN-GSC
  • PRIDE
  • SAGE
  • SAMTEX
  • UCL
  • UofAdelaide
  • UofAlberta
  • UofUtah
  • USArray
  • USGS-GEOMAG
  • USGS-GGGSC
  • USMTArray
  • UW
  • YSRP
  • YuzawaSGR
  • All
  • 2005
  • 2005-SFR
  • 2010
  • 2011-2013 BBMT profile
  • 2014
  • Abitibi 1990
  • Abitibi 1991
  • Abitibi-Grenville 1993
  • Alberta Array 2008
  • Alberta Array 2010
  • Alberta Basement
  • Aluto-Langano Geothermal
  • Backbone/Permanent Array
  • Beresford/Warburton complex 2011
  • Beresford/Warburton complex 2012
  • British Columbia Array 2009
  • CAFE-MT Long Period
  • Capricorn Orogen
  • Carlin
  • Chile MT
  • CO
  • CONUS SoCal
  • CONUS South
  • Costa Rica
  • Curnamona
  • Damara Mobile Belt
  • DFG BR1351/2-3
  • DFG BR1351/3-1
  • DFG BR1351/9-1
  • Florida 2015 Long Period
  • Florida 2015 Wideband
  • Freeling Springs 2012
  • Gawler
  • Gawler-Officer-Musgrave-Amadeus
  • Geophysics Field Camp 2023
  • Georgina-Arunta
  • JMA
  • Kaapvaal 2003
  • Kaapvaal 2004
  • Kaapvaal 2005
  • Kang to Ghazi
  • Kansas 2017 Long Period
  • Kapuskasing Structural Zone
  • KBN 2P04D02527
  • KBN 3P04D01823
  • KBN 9T12B02515
  • KBN PB0854/S6/94/06, KBN 6P04D01220, KBN 6P04D03512
  • Kimberley 2003
  • Kimberley 2004
  • Kyrgyzstan-China MANAS
  • Lithoprobe East
  • MAGIC
  • MAK 2006
  • MIWIMN
  • MOARTNILKY
  • MOCHA-land
  • Naruko
  • NCN 2011/01/B/ST10/07046
  • NE Namibia 2006
  • Nepabunna 2010
  • Nicaragua
  • N N307 0249633
  • N N307 097437
  • NOD
  • North Chile Central Altiplano
  • North Queensland
  • Okavango
  • Ontario 1992
  • Paralana
  • Payun
  • Pontiac 1990
  • Purcell Overthrust, Belt Basin
  • Red Deer Conductor Array 2008
  • RGR
  • San Andreas Fault
  • Santo Domingo Pueblo
  • Sanzugawa
  • Sierra Nevada
  • Sierras de Cordoba
  • SN
  • SNORCLE
  • South Chile
  • Southern Alberta Array 2009
  • Southern Alberta Array 2010
  • Southern Cordillera
  • Southern Cordillera 1983
  • Southern Cordillera 1984
  • Southern Cordillera 1986
  • Southern Cordillera 1990
  • Southern Delamerian 2010-2012
  • Stage IV
  • statutory IG PAS 2004
  • Tian Shan 1999
  • Trans-Hudson Orogen
  • Trans-Hudson Orogen Transect
  • Transportable Array
  • Unknown
  • Wabma Kadarbu 2011
  • Warburton Spring 2012
  • Western Superior Transect
  • Windhoek
  • WITS 2004
  • WITS 2005
  • WUS
  • Yellowstone-Snake River Plain
  • YilgarnCraton-OfficerBasin-Musgrave
  • Youanmi
  • ZAM
  • Zimbabwe 2005
Type
  • Data and Metadata
  • Metadata Only
  • All
  • All
  • Academic Use Only
  • Conditions Apply
  • Paper Citation Required
  • Unrestricted Release
Preliminary USMTArray transfer functions processed with only the remote reference technique, even if high quality, are archived as unrated (quality rating zero). These will be replaced with the definitive transfer functions once available.

This database is documented by Kelbert et al (2018).
The EMTF XML format and file conversion utilities are described by Kelbert (2019). Reading and writing of EMTF XML is supported by EMTF FCU.
All data are oriented to geographic coordinates, but all historical files are also available in their original orientations. Please see the complete change log for database changes.
Data citations are provided for each survey; these should be referenced in publications.
Query Results: 7230 items found
ppPage: 1 of 73pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)Last modified (UTC)
Friendship, TX, USATXD3630.72-97.33USMTArrayCONUS South2023-08-15 16:24:002023-08-28 15:03:412024-02-22 13:28:27
Goose Lake, TX, USATXY2833.96-102.76USMTArrayCONUS South2023-08-04 21:18:032023-09-01 14:27:302024-02-22 13:28:36
Spavinaw Lake, OK, USAOKU3736.36-95.06USMTArrayCONUS South2023-07-29 16:48:152023-08-26 15:36:162024-02-22 13:28:23
Big Boggy, TX, USTXG3828.78-95.82USMTArrayCONUS South2023-07-27 18:41:262023-08-18 13:38:312024-02-22 13:28:32
Red Rock Creek, OK, USAOKU3436.56-97.52USMTArrayCONUS South2023-07-26 17:22:272023-08-23 13:52:062024-02-22 13:28:21
Cockerill Reservoir, OK, USAOKU3236.53-99.13USMTArrayCONUS South2023-07-25 21:03:032023-08-11 14:23:592024-02-22 13:28:20
Tater Hill, TX, USATXD3530.65-98.05USMTArrayCONUS South2023-07-20 18:01:262023-08-16 15:03:172024-02-22 13:28:26
Beaver River, OK, USAOKU2836.59-102.27USMTArrayCONUS South2023-07-19 18:03:442023-08-05 22:41:182024-02-22 13:28:20
Playa Lake, TX, USATXX2834.56-102.38USMTArrayCONUS South2023-07-17 21:08:222023-08-05 14:55:002024-02-22 13:28:35
Callaghan Ranch, TX, USATXI3427.87-99.23USMTArrayCONUS South2023-07-15 15:37:242023-08-26 14:24:492024-02-22 13:28:32
Capitol Area, TX, USAREE3630.20-97.23USMTArrayCONUS South2023-07-11 15:44:102023-08-14 02:29:132024-02-22 13:28:25
Arroyo Zopilote, TX, USATXJ3427.02-99.43USMTArrayCONUS South2023-07-01 20:03:172023-08-27 14:28:052024-02-22 13:28:33
Galveston Island, TX, USATXF3929.19-94.97USMTArrayCONUS South2023-06-22 21:37:352023-07-17 14:43:352024-02-22 13:28:30
Red River, OK, USAOKX3234.43-99.50USMTArrayCONUS South2023-06-22 16:05:562023-07-06 15:31:082024-02-22 13:28:24
Todd Mission, TX, USATXE3830.23-95.84USMTArrayCONUS South2023-06-21 17:05:512023-07-19 13:14:002024-02-22 13:28:28
San Marcos River, TX, USATXF3629.59-97.58USMTArrayCONUS South2023-06-18 16:23:132023-07-03 13:48:122024-02-22 13:28:29
Lake Thunderbird, OK, USAOKW3535.17-97.10USMTArrayCONUS South2023-06-10 23:12:292023-07-10 16:11:082024-02-22 13:07:56
Brazos River, TX, USATXF3829.69-96.06USMTArrayCONUS South2023-06-06 21:52:012023-06-23 15:08:112024-02-22 13:08:34
Waco Lake, TX, USATXC3631.56-97.24USMTArrayCONUS South2023-06-06 20:29:202023-06-25 05:57:492024-02-22 13:08:17
Laguna Atascosa, TX, USATXK3726.16-97.36USMTArrayCONUS South2023-05-25 22:50:092023-06-29 13:18:282024-02-22 13:08:46
Overflow Creek, AR, USAARZ4333.11-91.63USMTArrayCONUS South2023-05-24 20:32:392023-06-03 22:39:352024-02-22 20:13:34
Bastrop, TX, USATXE3630.11-97.26USMTArrayCONUS South2023-05-19 22:28:232023-06-16 13:45:112024-02-22 13:08:26
Walden South, CO, USACO70140.65-106.21MinesGeophysics Field Camp 20232023-05-19 10:30:002023-05-25 10:30:002023-07-31 14:46:06
Red Canyon, CO, USACO70640.71-106.55MinesGeophysics Field Camp 20232023-05-18 14:00:002023-05-25 13:00:002023-07-31 14:46:06
Grizzly Creek, CO, USACO70440.43-106.52MinesGeophysics Field Camp 20232023-05-17 14:15:002023-05-19 07:30:002023-07-31 14:46:06
Cow Creek, CO, USACO70240.44-106.94MinesGeophysics Field Camp 20232023-05-16 15:00:002023-05-25 15:00:002023-07-31 14:46:06
Purdy Hill, TX, USARED3330.84-99.23USMTArrayCONUS South2023-05-12 18:02:072023-06-02 15:06:032024-02-22 20:14:52
Old Sabine Bottom, TX, USATXA3832.59-95.36USMTArrayCONUS South2023-05-11 19:27:332023-06-05 16:59:152024-02-22 20:15:58
Devil's Sinkhole, TX, USATXE3230.06-100.11USMTArrayCONUS South2023-05-10 20:55:312023-06-08 06:30:082024-02-22 13:08:23
Kickapoo Cavern, TX, USATXF3229.60-100.43USMTArrayCONUS South2023-05-09 14:45:332023-06-04 15:00:572024-02-22 20:17:57
Cimarron River, OK, USAOKV3535.95-97.09USMTArrayCONUS South2023-05-07 16:27:002023-06-09 16:44:062024-02-22 13:07:51
Cleo Springs, OK, USAOKU3336.39-98.38USMTArrayCONUS South2023-05-05 21:07:452023-05-20 16:38:302024-02-22 20:13:54
Aquilla Lake, TX, USATXB3631.94-97.18USMTArrayCONUS South2023-05-04 22:10:402023-05-15 15:43:502024-02-22 20:16:18
Winter Creek, OK, USAOKW3434.98-97.71USMTArrayCONUS South2023-05-03 23:38:382023-06-11 17:21:102024-02-22 13:07:53
Ray Roberts Lake, TX, USAREZ3633.40-97.00USMTArrayCONUS South2023-05-02 20:10:342023-06-12 18:08:172024-02-22 13:08:10
Fort Richardson, Texas, USATXZ3433.24-98.13USMTArrayCONUS South2023-05-01 23:33:162023-06-15 14:22:142024-02-22 13:08:49
Lake Bob Sadlin, Texas, USATXZ3833.06-95.10USMTArrayCONUS South2023-04-28 22:32:502023-05-09 15:31:392024-02-22 20:19:40
Eufaula Lake, Oklahoma, USAREW3735.19-95.59USMTArrayCONUS South2023-04-27 21:53:262023-05-08 15:56:142024-02-22 20:15:32
Government Canyon, TX, USATXF3429.60-98.73USMTArrayCONUS South2023-04-24 22:09:322023-05-07 14:24:082024-02-22 20:18:17
Black Jack Ridge, Alabama, USAALY4933.52-86.43USMTArrayCONUS South2023-04-23 15:37:162023-05-26 14:57:362024-02-22 20:13:14
Sal Del Rey, TX, USATXK3626.55-98.06USMTArrayCONUS South2023-04-17 20:42:552023-06-11 11:58:112024-02-22 13:08:41
Los Olmos, TX, USATXK3526.44-98.78USMTArrayCONUS South2023-04-17 01:18:372023-06-28 14:04:052024-02-22 13:08:38
Walker Branch, TX, USATXZ3533.37-97.54USMTArrayCONUS South2023-04-15 19:03:132023-04-27 15:51:212024-02-22 20:19:21
Somerville Lake, TX, USATXE3730.28-96.56USMTArrayCONUS South2023-04-12 19:26:312023-04-26 14:04:122024-02-22 20:17:39
Mason Mountain, TX, USATXD3330.85-99.23USMTArrayCONUS South2023-03-31 19:30:032023-05-05 16:52:312024-02-22 20:17:11
Richland Creek, TX, USATXB3732.02-96.07USMTArrayCONUS South2023-03-29 20:25:062023-04-16 16:58:052024-02-22 20:16:38
Sportsman Lake, OK, USAOKW3635.20-96.55USMTArrayCONUS South2023-03-28 21:33:312023-04-05 21:03:152024-02-22 20:14:32
Nesho River, OK, USARET3736.95-95.03USMTArrayCONUS South2023-03-26 22:39:422023-04-19 21:20:452024-02-22 20:15:11
Choke Canyon, TX, USATXH3528.51-98.37USMTArrayCONUS South2023-03-24 19:08:102023-04-21 15:16:462024-02-22 20:18:43
Polk, AR, United StatesREX3934.46-94.28USMTArrayCONUS South2023-03-22 20:01:322023-04-25 18:41:182024-02-22 13:08:05
Trinity River, TX, USATXE3930.27-94.81USMTArrayCONUS South2023-03-13 21:32:262023-04-07 18:18:252023-09-29 16:14:06
Pine Creek Mountain, OK, USAREX3734.50-95.63USMTArrayCONUS South2023-03-10 21:28:222023-04-17 21:12:092023-09-29 22:20:19
Ozark Plateau, OK, USAREV3835.70-94.53USMTArrayCONUS South2023-03-10 20:50:132023-03-27 16:39:292023-09-29 16:14:29
Pat Mayse Lake, TX, USATXY3733.82-95.67USMTArrayCONUS South2023-03-07 18:56:392023-03-28 11:26:382023-09-29 16:15:25
Anahuac, TX, USATXF4029.62-94.55USMTArrayCONUS South2023-02-28 20:01:152023-04-08 16:18:032023-09-29 16:14:39
Topisaw Creek, MS, USAMSC4531.36-90.27USMTArrayCONUS South2023-02-26 22:26:312023-04-07 12:53:552023-09-29 16:14:34
Arkabutla Lake, MS, USAREW4434.80-90.06USMTArrayCONUS South2023-02-23 22:21:222023-03-05 19:30:592023-09-29 22:20:02
Wright Patman Lake, TX, USATXZ3933.24-94.35USMTArrayCONUS South2023-02-22 22:06:192023-04-18 17:56:382023-09-29 16:15:13
White Rock, AR, USAARV3935.74-93.68USMTArrayCONUS South2023-02-20 17:52:232023-04-20 18:14:172023-09-29 22:18:52
Buttahatchee, AL, USAALX4734.23-87.88USMTArrayCONUS South2023-02-17 23:44:182023-03-30 22:14:092023-09-29 22:18:34
Wake Creek, AR, USAREX4034.50-93.43USMTArrayCONUS South2023-02-17 21:05:092023-04-12 16:48:172023-09-29 16:13:23
Sunrise Bayou, MS, USAMSX4434.44-90.32USMTArrayCONUS South2023-02-11 23:17:092023-02-25 17:25:472023-09-29 16:15:43
Shongelo Creek, MS, USAMSB4632.03-89.46USMTArrayCONUS South2023-02-07 20:04:242023-03-03 17:19:152023-09-29 22:19:09
Leaf River, MS, USAMSC4731.07-88.95USMTArrayCONUS South2023-02-05 21:52:082023-02-21 19:40:352023-09-29 16:15:31
Little Biloxi, MS, USAMSD4730.68-89.19USMTArrayCONUS South2023-02-05 00:25:542023-03-04 17:02:362023-09-29 22:19:27
Mount Enterprise, TX, USATXB3931.87-94.66USMTArrayCONUS South2023-01-27 20:59:582023-03-17 15:07:102023-09-29 16:13:48
Davy Crockett, TX, USATXC3931.32-94.98USMTArrayCONUS South2023-01-26 20:22:292023-03-04 17:25:402023-09-29 16:14:47
Houston County Lake, TX, USATXC3831.39-95.54USMTArrayCONUS South2023-01-25 20:21:452023-03-03 16:49:342023-09-29 16:14:55
Bobbitt Creek, TX, USATXC4031.32-94.07USMTArrayCONUS South2023-01-23 21:33:132023-03-02 16:51:332023-09-29 16:14:01
Ten Mile Gully, TX, USATXE4030.26-94.33USMTArrayCONUS South2023-01-22 18:45:062023-02-22 16:21:442023-09-29 16:13:43
Big Thicket, TX, USATXD4030.76-94.19USMTArrayCONUS South2023-01-20 20:18:262023-02-14 02:35:572023-09-29 16:15:08
Duck Hill, MS, USAMSY4533.60-89.65USMTArrayCONUS South2023-01-14 20:03:142023-02-09 18:17:402023-09-29 22:19:45
Wake Creek, AR, USAARX4034.52-93.35USMTArrayCONUS South2023-01-11 19:38:042023-02-12 17:40:432023-09-29 16:13:33
Board Camp Creek, AR, USAARX3934.49-94.10USMTArrayCONUS South2023-01-10 17:11:572023-02-21 17:53:152023-09-29 16:14:19
Cypress Creek, TN, USATNV4535.62-88.95USMTArrayCONUS South2022-12-15 19:45:242023-01-02 04:26:152023-06-20 22:56:30
Big Creek, MS, USAMSB4531.96-90.09USMTArrayCONUS South2022-12-06 19:36:492023-01-13 18:56:572023-06-20 22:55:05
Parker Lake, AL, USATTZ5032.78-86.06USMTArrayCONUS South2022-12-03 19:31:022023-01-04 15:51:552023-06-20 22:57:04
Lost Creek, AL, USAALY4833.64-87.27USMTArrayCONUS South2022-12-02 16:33:502023-01-04 20:00:572023-06-20 22:52:44
Duck Hill, MS, USAMSB4731.77-88.59USMTArrayCONUS South2022-11-14 18:20:512022-12-04 17:37:212023-06-20 22:55:21
Wattensaw Bayou, AR, USATTW4234.97-91.64USMTArrayCONUS South2022-11-10 17:42:102022-11-12 13:08:202023-06-20 22:56:47
Lamotte Creek, LA, USALAC4231.24-92.61USMTArrayCONUS South2022-11-06 20:35:322023-01-12 20:38:032023-06-20 22:54:47
Killian Creek, LA, USALAB4231.82-92.51USMTArrayCONUS South2022-11-05 20:53:142022-12-07 18:36:192023-06-20 22:54:31
Holly Springs, MS, USAMSX4534.41-89.32USMTArrayCONUS South2022-10-26 21:00:022022-11-12 18:15:222023-06-20 22:55:39
Madden Mill Creek, LA, USALAA4132.42-93.18USMTArrayCONUS South2022-10-20 19:56:272022-12-08 18:12:462023-06-20 22:53:56
Colston Creek, LA, USALAA4232.40-92.51USMTArrayCONUS South2022-10-19 21:39:032022-11-03 18:02:582023-06-20 22:54:14
Departee Creek, AR, USAARV4235.58-91.51USMTArrayCONUS South2022-10-17 23:05:592022-11-11 18:26:152023-06-20 22:53:02
Reed Branch, FL, USAFLC4930.98-87.55USMTArrayCONUS South2022-09-25 21:41:512022-11-15 16:26:282023-06-20 22:53:39
Tombigbee River, AL, USAALB4831.66-88.08USMTArrayCONUS South2022-09-24 21:10:312022-10-08 16:55:342023-06-20 22:52:27
Elvis Presley Lake, MS, USAMSX4634.31-88.65USMTArrayCONUS South2022-09-22 19:24:332022-10-07 16:37:222023-06-20 22:55:56
Spybuck Creek, AR, USAREW4335.05-90.94USMTArrayCONUS South2022-09-19 21:12:482022-10-04 16:15:282023-06-20 22:56:13
Elbow Slough, AR, USAREW4235.09-91.54USMTArrayCONUS South2022-09-17 20:03:242022-10-02 16:34:182023-04-04 16:58:59
Ozark Island, AR, USAARY4333.78-91.19USMTArrayCONUS South2022-09-16 20:15:242022-10-11 16:39:282023-06-20 22:53:18
Cat Island, LA, USALAD4430.79-91.45USMTArrayCONUS South2022-09-13 18:54:432022-09-27 16:18:352023-04-04 16:50:32
Atwood Creek, AR, USAARY4233.91-92.13USMTArrayCONUS South2022-09-03 20:57:252022-09-18 17:06:532023-04-04 16:47:27
Warmer Gulch, CO, USACO21238.71-105.51USGS-GGGSCCO2022-09-02 01:00:002022-09-02 12:56:002023-03-22 16:38:33
Gene Rush, AR, USAARV4035.90-93.02USMTArrayCONUS South2022-08-31 20:04:102022-10-01 17:11:452023-04-04 16:40:23
Jones Pass, CO, USACO31639.76-105.91USGS-GGGSCCO2022-08-31 20:00:002021-09-04 22:15:002023-03-22 16:38:33
Phantom Canyon, CO, USACO21038.65-105.12USGS-GGGSCCO2022-08-30 17:00:002022-09-03 22:15:002023-03-22 16:38:33
Dirty Gulch, CO, USACO21638.46-105.71USGS-GGGSCCO2022-08-29 22:00:002022-09-01 18:06:002023-03-22 16:38:33
County Road 53, CO, USACO21338.69-105.83USGS-GGGSCCO2022-08-29 18:00:002022-09-01 16:26:002023-03-22 16:38:33
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