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
MOCHA
NRCAN-GSC
PRIDE
SAGE
SAMTEX
UCL
UofAdelaide
UofAlberta
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
  • MOCHA
  • NRCAN-GSC
  • PRIDE
  • SAGE
  • SAMTEX
  • UCL
  • UofAdelaide
  • UofAlberta
  • 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
  • Chile MT
  • 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
  • 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
  • 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
  • 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: 6865 items found
ppPage: 1 of 69pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)Last modified (UTC)
Holly Springs, MS, USAMSX4534.41-89.32USMTArrayCONUS South2022-10-26 21:00:022022-11-12 18:15:222022-12-13 09:38:33
Colston Creek, LA, USALAA4232.40-92.51USMTArrayCONUS South2022-10-19 21:39:032022-11-03 18:02:582022-12-13 09:38:36
Departee Creek, AR, USAARV4235.58-91.51USMTArrayCONUS South2022-10-17 23:05:592022-11-11 18:26:152022-12-13 09:38:37
Reed Branch, FL, USAFLC4930.98-87.55USMTArrayCONUS South2022-09-25 21:41:512022-11-15 16:26:282022-12-13 09:38:34
Tombigbee River, AL, USAALB4831.66-88.08USMTArrayCONUS South2022-09-24 21:10:312022-10-08 16:55:342022-12-13 16:39:49
Elvis Presley Lake, MS, USAMSX4634.31-88.65USMTArrayCONUS South2022-09-22 19:24:332022-10-07 16:37:222022-12-13 16:40:32
Spybuck Creek, AR, USAREW4335.05-90.94USMTArrayCONUS South2022-09-19 21:12:482022-10-04 16:15:282022-12-13 16:40:50
Elbow Slough, AR, USAREW4235.09-91.54USMTArrayCONUS South2022-09-17 20:03:242022-10-02 16:34:182022-11-01 15:19:11
Ozark Island, AR, USAARY4333.78-91.19USMTArrayCONUS South2022-09-16 20:15:242022-10-11 16:39:282022-12-13 16:40:09
Cat Island, LA, USALAD4430.79-91.45USMTArrayCONUS South2022-09-13 18:54:432022-09-27 16:18:352022-11-01 15:18:18
Atwood Creek, AR, USAARY4233.91-92.13USMTArrayCONUS South2022-09-03 20:57:252022-09-18 17:06:532022-11-01 15:20:24
Gene Rush, AR, USAARV4035.90-93.02USMTArrayCONUS South2022-08-31 20:04:102022-10-01 17:11:452022-11-01 15:17:45
Lake Lipscomb, MS, USAMSW4434.89-90.07USMTArrayCONUS South2022-08-25 22:52:492022-09-06 18:57:412022-11-01 15:18:49
Petit Jean River, AR, USAARW4035.09-93.26USMTArrayCONUS South2022-08-23 19:23:092022-09-12 20:18:342022-11-01 15:19:06
Jennings Mountain, AR, USAARW3935.10-94.03USMTArrayCONUS South2022-08-21 17:30:392022-09-12 16:56:162022-11-01 15:18:01
Trim Cane, MS, USAMSY4633.52-88.85USMTArrayCONUS South2022-08-14 20:41:172022-09-10 16:38:552022-11-01 15:16:59
Huckleberry Ridge, MO, USAMOU3836.59-94.33USMTArrayCONUS South2022-08-14 19:45:422022-09-10 18:13:512022-11-01 15:18:38
Pelican Mountain, MO, USAMOU3936.51-93.78USMTArrayCONUS South2022-08-11 21:10:462022-09-10 21:37:252022-11-01 15:19:34
Nanih Waiyah, MS, USAMSZ4632.87-89.04USMTArrayCONUS South2022-08-11 18:16:532022-09-11 16:36:452022-11-01 15:19:57
Chipola River, FL, USALCC5230.89-85.28USMTArrayCONUS South2022-08-07 16:40:362022-08-21 23:37:532022-11-01 15:18:22
Noxubee River, MS, USAMSZ4732.95-88.39USMTArrayCONUS South2022-08-01 23:27:222022-08-29 15:52:062022-11-01 15:20:06
Willow Springs, MO, USAMOT4137.02-92.07USMTArrayCONUS South2022-07-27 19:16:422022-08-27 17:29:512022-11-01 15:17:12
Apookta Creek, MS, USAMSZ4533.12-89.71USMTArrayCONUS South2022-07-26 15:14:452022-08-27 23:07:112022-11-01 15:18:53
Rollison Prairie, MS, USAMSA4532.46-89.83USMTArrayCONUS South2022-07-23 20:24:012022-08-27 15:31:592022-11-01 15:19:39
Choppy Knob, AR, USAARV4135.68-92.17USMTArrayCONUS South2022-07-19 15:11:372022-09-04 19:19:592022-11-01 15:17:04
Cornie Bayou, AR, USAARZ4133.03-92.98USMTArrayCONUS South2022-07-16 18:56:382022-08-19 21:14:122022-11-01 15:17:51
Redeye Lake, AR, USAARZ4233.12-92.17USMTArrayCONUS South2022-07-14 18:28:232022-07-28 16:11:442022-11-01 15:17:26
Cross Lake, LA, USALAA4032.49-93.94USMTArrayCONUS South2022-07-12 20:07:592022-08-12 18:14:352022-11-01 15:19:23
Dayberry Creek, AR, USAARU4236.27-91.28USMTArrayCONUS South2022-07-10 20:25:592022-09-21 16:37:092022-11-01 15:18:57
Dotted Lake, AR, USAARX4134.48-92.59USMTArrayCONUS South2022-07-08 16:18:252022-08-19 18:08:042022-11-01 15:18:07
Grapevine Island, AR, USAARV4335.68-90.41USMTArrayCONUS South2022-06-30 18:17:332022-07-15 15:33:042022-11-01 15:19:30
Otter Pond, TN, USATNV4435.68-89.80USMTArrayCONUS South2022-06-28 17:23:422022-08-03 15:25:162022-11-01 15:20:18
Tensas River, LA, USALAA4332.35-91.43USMTArrayCONUS South2022-06-28 01:37:472022-07-19 17:08:022022-11-01 15:20:14
Ghost River, TN, USATNW4535.03-89.25USMTArrayCONUS South2022-06-27 17:47:542022-08-05 16:36:132022-11-01 15:18:12
Florida Caverns, FL, USATTC5230.81-85.24USMTArrayCONUS South2022-06-26 00:34:522022-08-03 16:04:002022-11-01 15:19:53
Windsor Mound, MS, USAMSB4431.90-91.13USMTArrayCONUS South2022-06-20 01:08:262022-07-04 20:14:352022-11-01 15:19:47
Tom's Mountain, AR, USAARW4135.07-92.60USMTArrayCONUS South2022-06-18 14:25:432022-08-01 15:24:392022-11-01 15:18:30
Beaver Branch, MS, USAMSC4431.40-91.17USMTArrayCONUS South2022-06-18 00:22:552022-07-17 00:22:392022-11-01 15:17:36
Cossatat River, AR, USAARY3933.89-94.23USMTArrayCONUS South2022-06-14 23:16:312022-07-07 21:27:082022-11-01 15:18:26
Bear Branch, AR, USAARY4133.75-92.77USMTArrayCONUS South2022-06-11 23:35:152022-07-09 15:39:212022-11-01 15:17:32
Newsome Bayou, MS, USAMSA4432.56-90.87USMTArrayCONUS South2022-06-09 22:21:542022-06-28 19:18:362022-11-01 15:20:10
White Mountain, AZ, USAREY1933.84-109.47USMTArrayCONUS South2022-05-07 00:22:342022-06-04 20:51:302022-11-01 15:13:38
Ash Mountain, AZ, USAAZY1833.80-110.57USMTArrayCONUS South2022-05-06 01:23:502022-06-05 20:21:462022-11-01 15:13:17
Silver Lake, GA, USAGAC5330.82-84.71USMTArrayCONUS South2022-05-03 16:42:252022-06-06 16:29:002022-11-01 15:11:07
Lake Des Arc, AR, USAARW4235.02-91.52USMTArrayCONUS South2022-04-28 20:53:092022-05-15 06:45:152022-11-01 15:11:23
Second Creek, AR, USAARW4335.09-90.93USMTArrayCONUS South2022-04-27 19:36:462022-06-06 19:57:032022-11-01 15:12:45
Dale Bumpers, AR, USAARX4334.32-91.13USMTArrayCONUS South2022-04-25 22:36:562022-07-03 19:06:042022-11-01 15:17:20
Spring Bank, AR, USAARZ4033.06-93.70USMTArrayCONUS South2022-04-22 21:13:322022-06-01 14:59:092022-11-01 15:11:17
Bayou Meto, AR, USAARX4234.38-91.72USMTArrayCONUS South2022-04-22 20:28:032022-07-17 15:56:452022-11-01 15:19:15
Dalewood Shore Lake, MS, USAMSA4732.45-88.48USMTArrayCONUS South2022-04-21 20:43:512022-05-30 12:13:152022-11-01 15:11:11
Ozan Creek, AR, USAARY4033.92-93.51USMTArrayCONUS South2022-04-21 20:43:092022-07-10 16:33:142022-11-01 15:18:44
Big Sunflower River, MS, USAMSZ4433.00-90.72USMTArrayCONUS South2022-04-20 21:12:402022-05-22 13:51:072022-11-01 15:12:19
Bollybusha Creek, MS, USAMSA4632.49-89.24USMTArrayCONUS South2022-04-20 20:40:272022-04-29 18:13:022022-11-01 15:11:33
Parks Bayou, MS, USAMSY4433.80-90.38USMTArrayCONUS South2022-04-19 22:26:392022-04-29 08:03:502022-11-01 15:12:15
Bull Shoals Lake, AR, USAARU4036.50-92.91USMTArrayCONUS South2022-04-14 20:30:362022-04-29 21:35:592022-11-01 15:13:42
Tuscumbia, MS, USAMSW4634.94-88.59USMTArrayCONUS South2022-04-14 20:23:252022-05-15 17:09:572022-11-01 15:12:02
Shoal Creek, AL, USAALW4734.89-87.57USMTArrayCONUS South2022-04-13 19:04:502022-05-14 18:25:062022-11-01 15:13:04
Norfork Lake, AR, USAARU4136.37-92.20USMTArrayCONUS South2022-04-12 22:07:442022-04-29 17:44:502022-11-01 15:12:34
Florida Caverns, FL, USAREC5230.81-85.24USMTArrayCONUS South2022-04-11 21:09:382022-05-27 06:22:512022-11-01 15:12:10
Beech River, TN, USATNV4635.62-88.21USMTArrayCONUS South2022-04-10 22:31:362022-05-04 23:40:132022-11-01 15:13:20
Cat Creek, FL, USATTD5230.39-85.57USMTArrayCONUS South2022-04-09 23:38:132022-04-26 20:22:522022-11-01 15:13:58
Grayton Beach, FL, USAFLD5130.34-86.17USMTArrayCONUS South2022-04-07 22:49:152022-04-26 16:54:092022-11-01 15:12:51
Clemar Creek, LA, USALAB4031.92-93.87USMTArrayCONUS South2022-03-31 19:05:472022-04-26 08:37:422022-11-01 15:13:47
Inman Creek, AL, USAALX4834.23-87.23USMTArrayCONUS South2022-03-25 21:31:172022-04-19 18:09:082022-11-01 15:14:09
Econfina Creek, FL, USARED5230.34-85.57USMTArrayCONUS South2022-03-24 17:59:322022-04-09 17:03:252022-11-01 15:14:13
Redman Mesa, AZ, USAREY1733.94-111.04USMTArrayCONUS South2022-03-23 00:23:002022-05-02 21:17:472022-11-01 15:11:28
Tin Top Bay, FL, USAFLD5330.16-84.73USMTArrayCONUS South2022-03-21 20:05:052022-05-31 14:19:162022-11-01 15:11:42
Choctawhatchee River, FL, USAREC5130.92-85.87USMTArrayCONUS South2022-03-20 20:49:462022-04-15 19:36:102022-11-01 15:12:39
Peason Ridge, LA, USALAC4131.38-93.36USMTArrayCONUS South2022-03-16 20:16:032022-04-08 07:29:532022-11-01 15:14:03
Speckled Snake Trail, AL, USAREZ5032.85-85.94USMTArrayCONUS South2022-03-16 16:00:002022-03-27 10:40:562022-11-01 15:12:30
Grand Bayou, LA, USALAB4132.05-93.26USMTArrayCONUS South2022-03-14 19:35:272022-04-23 19:16:392022-11-01 15:12:25
Powell Creek Lake, AL, USAALA4832.39-87.76USMTArrayCONUS South2022-03-14 18:49:512022-04-22 15:51:052022-11-01 15:13:24
Clear Creek, AL, USAALY4733.53-88.02USMTArrayCONUS South2022-03-13 21:52:052022-04-01 11:19:442022-11-01 15:13:32
Elliots Creek, AL, USAALZ4832.95-87.51USMTArrayCONUS South2022-03-12 21:00:092022-04-02 18:18:412022-11-01 15:11:37
West Bay, LA, USALAD4230.71-92.84USMTArrayCONUS South2022-03-08 20:00:282022-04-02 15:46:412022-11-01 15:13:52
Old River, MS, USAMSD4630.69-89.80USMTArrayCONUS South2022-03-05 22:30:492022-03-18 16:47:252022-11-18 23:54:04
Honeysuckle Creek, AL, USAALZ4932.79-86.96USMTArrayCONUS South2022-03-05 20:01:492022-04-03 16:28:122022-11-01 15:12:54
Gila River, AZ, USAAZZ1833.16-110.55USMTArrayCONUS South2022-03-04 21:38:082022-05-04 20:08:452022-11-01 15:13:09
Wind Creek, AL, USAALZ5032.86-85.94USMTArrayCONUS South2022-03-02 23:21:222022-03-16 16:06:042022-11-18 23:49:50
Virtud Tank, AZ, USAREB1631.87-111.58USMTArrayCONUS South2022-02-27 22:33:142022-03-06 22:31:492022-11-18 23:54:21
Escribano, FL, USAFLD5030.50-86.99USMTArrayCONUS South2022-02-21 20:04:392022-03-08 16:12:322022-11-18 23:52:06
Sells Valley, AZ, USAAZB1631.94-111.92USMTArrayCONUS South2022-02-19 23:26:182022-02-25 19:15:202022-11-18 23:50:07
Crane Pond Branch, AL, USAALC4831.15-88.20USMTArrayCONUS South2022-02-19 22:30:122022-04-09 11:31:232022-11-01 15:11:52
Clear Creek, LA, USALAD4130.88-93.50USMTArrayCONUS South2022-02-19 20:14:322022-03-17 15:21:542022-11-18 23:52:56
Chiricahua, AZ, USAREB1932.01-109.39USMTArrayCONUS South2022-02-08 23:16:442022-03-02 19:06:192022-11-18 23:54:37
Vickers Creek, AL, USAALA5032.15-86.38USMTArrayCONUS South2022-02-08 23:16:122022-03-03 17:03:482022-11-18 23:47:53
Ash Creek, AZ, USAAZB1832.08-110.46USMTArrayCONUS South2022-02-07 23:47:512022-03-01 19:51:072022-11-18 23:50:23
Sevenmile Mountain, AZ, USAAZZ1633.13-112.21USMTArrayCONUS South2022-02-06 19:55:312022-03-20 19:43:382022-11-18 23:51:31
Upper Wolf Bay Savanna, AL, USAALD4930.35-87.58USMTArrayCONUS South2022-02-05 21:57:592022-02-18 19:20:262022-11-18 23:49:34
Sicily Island, LA, USALAB4331.82-91.76USMTArrayCONUS South2022-02-05 20:47:562022-03-06 13:26:012022-11-18 23:52:23
South Fork Cowikee Creek, AL, USAALA5132.03-85.48USMTArrayCONUS South2022-02-02 22:27:302022-02-26 20:15:122022-11-18 23:48:10
Dismal Swamp, LA, USALAC4331.26-91.76USMTArrayCONUS South2022-02-02 20:29:212022-03-20 11:02:002022-11-18 23:52:39
Thistlethwaite, LA, USALAD4330.68-92.00USMTArrayCONUS South2022-02-01 22:03:122022-02-25 19:21:332022-11-18 23:53:13
Big Bay Lake, MS, USAMSC4631.18-89.60USMTArrayCONUS South2022-01-27 19:53:422022-02-21 18:54:082022-11-18 23:53:47
Natalbany River, LA, USALAD4530.67-90.59USMTArrayCONUS South2022-01-24 20:40:202022-02-23 17:53:162022-11-18 23:53:30
Plummer Lake, AL, USAALA4932.29-86.92USMTArrayCONUS South2022-01-24 19:49:102022-02-27 18:43:462022-11-18 23:47:35
Manzanita Tank, AZ, USAAZW1535.05-112.50USMTArrayCONUS South2022-01-22 22:31:582022-02-12 17:33:592022-11-18 23:51:14
Chinquapin Creek, AL, USAALB5031.52-86.44USMTArrayCONUS South2022-01-21 21:59:162022-02-23 20:06:322022-11-18 23:48:43
Johnson Creek, AL, USAALB5131.52-85.81USMTArrayCONUS South2022-01-19 22:18:472022-02-20 22:53:122022-11-18 23:49:00
Jeddito Wash, AZ, USAAZV1835.74-110.14USMTArrayCONUS South2022-01-17 20:23:162022-02-13 19:35:182022-11-18 23:50:57
ppPage: 1 of 69pp