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: 7288 items found
ppPage: 1 of 73pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)Last modified (UTC)
Faith Ranch, TX, USATXH3328.26-99.93USMTArrayCONUS South2024-02-26 19:57:152024-03-11 06:24:112024-06-03 21:26:33
Campbell Island, TX, USATXA3532.55-97.80USMTArrayCONUS South2024-02-21 23:57:392024-03-03 18:31:262024-06-03 21:25:58
Pease River, TX, USATXY3234.08-99.75USMTArrayCONUS South2024-02-12 20:29:502024-02-23 18:34:582024-06-03 21:26:39
Dodd Branch, TX, USATXC3531.41-97.80USMTArrayCONUS South2024-02-10 19:13:572024-02-19 17:43:342024-06-03 21:26:07
Evansville Peak, TX, USAREA3432.52-98.54USMTArrayCONUS South2024-02-09 20:37:482024-03-04 17:53:042024-06-03 21:25:51
Sabana River, TX, USATXB3432.10-98.60USMTArrayCONUS South2024-02-06 21:01:472024-03-07 18:24:452024-06-03 21:25:59
Possum Kingdom, TX, USATXA3432.85-98.57USMTArrayCONUS South2024-01-31 20:24:492024-02-08 17:15:142024-06-03 21:25:57
Enchanted Rock, TX, USATXE3430.49-98.82USMTArrayCONUS South2024-01-27 17:45:582024-02-26 04:41:242024-06-03 21:26:15
Anderson Chapel, TX, USATXA3232.72-99.97USMTArrayCONUS South2024-01-22 21:22:582024-02-01 17:01:042024-06-03 21:25:55
Lake Raven, TX, USATXD3830.61-95.52USMTArrayCONUS South2024-01-21 23:31:322024-02-29 18:37:532024-06-03 21:26:09
Taylor Hills, TX, USATXG3329.15-99.65USMTArrayCONUS South2024-01-19 19:03:062024-01-29 17:23:382024-06-03 21:26:27
Long Hollow, TX, USATXF3729.53-96.84USMTArrayCONUS South2024-01-16 23:07:562024-03-01 17:59:302024-06-03 21:26:22
Knox City, TX, USATXZ3233.44-99.79USMTArrayCONUS South2024-01-14 21:45:302024-01-23 17:27:442024-06-03 21:26:40
Shaffer Ranch, TX, USTXI3527.66-98.54USMTArrayCONUS South2024-01-13 21:53:442024-01-25 17:26:522024-06-03 21:26:36
Lake Merritt, TX, USATXC3431.47-98.51USMTArrayCONUS South2024-01-11 20:53:432024-01-28 18:13:542024-06-03 21:26:03
Espiritu Santo Bay, TX, USATXH3728.38-96.63USMTArrayCONUS South2024-01-10 19:07:432024-01-28 17:23:422024-06-03 21:26:34
Lake Mackenzie, Texas, USATXX2934.54-101.46USMTArrayCONUS South2023-12-18 20:32:352024-01-13 19:00:332024-06-03 21:26:38
Mitchell Crossing, TX, USATXC3331.38-99.34USMTArrayCONUS South2023-12-14 20:15:302024-01-08 16:40:442024-06-03 21:26:02
Dry Devils River, TX, USATXE3130.07-100.85USMTArrayCONUS South2023-12-10 20:26:562024-01-07 15:40:262024-06-03 21:26:11
Natural Bridge Caverns, Texas, USATXF3529.67-98.30USMTArrayCONUS South2023-12-09 21:04:402024-01-05 17:50:402024-06-03 21:26:19
Wildhorse Creek, OK, USAREX3534.59-97.59USMTArrayCONUS South2023-12-04 21:39:312023-12-13 19:27:302024-06-03 21:25:54
Boktuklo Mountains, OK, USAOKX3834.51-94.93USMTArrayCONUS South2023-12-01 22:26:182024-01-13 00:06:422024-06-03 21:25:48
Lipan Hills, Texas, USATXG3528.83-98.25USMTArrayCONUS South2023-11-23 21:18:232023-12-17 18:22:532024-06-03 21:26:29
Fifteen Mile Creek, TX, USATXG3628.93-97.42USMTArrayCONUS South2023-11-22 20:42:042023-12-04 18:31:582024-04-03 13:03:03
Torrey Peak, TX, USATXV2835.66-102.49USMTArrayCONUS South2023-11-16 20:07:572023-12-01 17:16:522024-04-03 13:03:10
Mustang Hollow, TX, USATXG3428.97-98.93USMTArrayCONUS South2023-11-15 21:38:572023-12-08 18:23:542024-04-03 13:03:01
Neches River, TX, USATXB3831.84-95.39USMTArrayCONUS South2023-11-13 23:11:012023-11-30 16:07:542024-04-03 13:02:52
Llano Estacado, TX, USATXA2832.44-102.69USMTArrayCONUS South2023-11-10 22:23:232023-11-30 19:01:262024-04-03 13:02:40
Brushy Lake, TX, USATXA2932.53-102.23USMTArrayCONUS South2023-11-08 22:13:422023-11-19 15:57:162024-04-03 13:02:41
McKenzie Draw, TX, USATXB2932.33-102.24USMTArrayCONUS South2023-11-08 14:13:102023-11-25 16:09:102024-04-03 13:02:47
Peloncillo Peak, TX, USATXG3229.04-100.31USMTArrayCONUS South2023-11-05 00:18:032023-11-16 20:01:332024-04-03 13:03:00
Chaparral, TX, USATXH3428.31-99.35USMTArrayCONUS South2023-11-03 19:27:202023-11-14 17:02:592024-04-03 13:03:06
Gyp Hill, OK, USAOKX3434.56-98.10USMTArrayCONUS South2023-11-02 16:33:002023-11-11 15:04:342024-04-03 13:02:37
Lake Diversion, TX, USTXY3333.75-98.95USMTArrayCONUS South2023-10-31 22:09:062023-11-10 16:47:532024-04-03 13:03:12
Hackberry Draw, TX, USATXC3031.55-101.24USMTArrayCONUS South2023-10-27 20:53:122023-12-03 16:43:542024-04-03 13:02:53
Capps Creek, MO, USAMOT3836.87-94.13USMTArrayCONUS South2023-10-24 19:50:062023-12-02 17:15:512024-04-03 13:02:30
Palmetto Bend, TX, USATXG3729.03-96.59USMTArrayCONUS South2023-10-21 21:10:272023-11-17 19:39:072024-04-03 13:03:05
Loving Ridge, MO, USAMOT4036.90-92.92USMTArrayCONUS South2023-10-17 19:54:102023-10-26 15:24:102024-04-03 13:02:36
Hayes Springs, MO, USAMOT3936.93-93.42USMTArrayCONUS South2023-10-15 20:21:322023-11-05 16:44:392024-04-03 13:02:34
Dinosaur State Park, TX, USATXB3532.24-97.83USMTArrayCONUS South2023-10-13 19:21:132023-11-09 15:09:532024-04-03 13:02:49
Lake Brownwood, TX, USATXB3331.85-99.02USMTArrayCONUS South2023-10-11 19:31:562023-10-23 14:38:482024-04-03 13:02:48
Colorado Bend, TX, USATXD3431.05-98.50USMTArrayCONUS South2023-10-08 20:38:002023-10-29 16:46:442024-04-03 13:02:57
Lake Tawakoni, TX, USATXA3732.84-96.00USMTArrayCONUS South2023-10-06 21:17:452023-10-14 15:15:462024-04-03 13:02:45
Copper Lake, TX, USATXZ3733.29-95.70USMTArrayCONUS South2023-10-05 18:05:302023-10-30 15:59:142024-04-03 13:03:13
Cayo Lake, TX, USATXJ3527.02-98.72USMTArrayCONUS South2023-10-05 17:53:452023-11-02 16:15:522024-04-03 13:03:07
Fluvanna, TX, USATXA3032.83-101.15USMTArrayCONUS South2023-09-23 20:52:302023-10-22 15:46:402024-04-03 13:02:42
Fox Canyon, OK, USARET3036.98-100.55USMTArrayCONUS South2023-09-19 17:47:282023-09-28 19:04:152024-04-03 13:02:09
Round Valley, CA, USACAT0737.41-118.60USMTArrayCONUS South2023-09-17 00:58:362023-10-01 18:55:532024-04-03 13:02:00
Regal Mine, AZ, USAREY1833.79-110.57USMTArrayCONUS South2023-09-13 00:13:392023-09-28 17:18:282024-04-03 13:02:11
Byers Peak, CO, USACOP2339.85-105.91USMTArrayCONUS South2023-09-09 23:16:132023-09-25 18:20:452024-04-03 13:02:02
Colt Mountain, TX, USATXY3433.75-97.85USMTArrayCONUS South2023-09-06 15:09:062023-09-30 16:40:252024-04-03 13:02:16
Candy Creek, OK, USAOKU3636.50-96.01USMTArrayCONUS South2023-09-03 20:06:352023-09-24 20:01:232024-04-03 13:02:04
Elephant Mountain, TX, USATXE2730.04-103.57USMTArrayCONUS South2023-09-03 19:34:232023-09-30 14:56:382024-04-03 13:02:13
Grassy Slough, OK, USAOKY3833.79-94.75USMTArrayCONUS South2023-08-31 22:29:342023-09-13 14:18:012024-04-03 13:02:07
Bald Knob, AR, USALCW4235.21-91.50USMTArrayCONUS South2023-08-28 21:00:542023-09-10 14:30:382024-04-03 13:02:03
Cayo Lake, TX, USTXJ3627.19-97.88USMTArrayCONUS South2023-08-25 18:46:072023-09-08 00:31:172024-04-03 13:02:14
San Bois Mountains, AR, USAREW3835.13-94.97USMTArrayCONUS South2023-08-25 17:09:592023-09-08 14:41:522024-04-03 13:02:10
Friendship, TX, USATXD3630.72-97.33USMTArrayCONUS South2023-08-15 16:24:002023-08-28 15:03:412024-04-03 12:59:47
Goose Lake, TX, USATXY2833.96-102.76USMTArrayCONUS South2023-08-04 21:18:032023-09-01 14:27:302024-04-03 12:59:55
Spavinaw Lake, OK, USAOKU3736.36-95.06USMTArrayCONUS South2023-07-29 16:48:152023-08-26 15:36:162024-04-03 12:59:43
Big Boggy, TX, USTXG3828.78-95.82USMTArrayCONUS South2023-07-27 18:41:262023-08-18 13:38:312024-04-03 12:59:51
Red Rock Creek, OK, USAOKU3436.56-97.52USMTArrayCONUS South2023-07-26 17:22:272023-08-23 13:52:062024-04-03 12:59:41
Cockerill Reservoir, OK, USAOKU3236.53-99.13USMTArrayCONUS South2023-07-25 21:03:032023-08-11 14:23:592024-04-03 12:59:40
Tater Hill, TX, USATXD3530.65-98.05USMTArrayCONUS South2023-07-20 18:01:262023-08-16 15:03:172024-04-03 12:59:46
Beaver River, OK, USAOKU2836.59-102.27USMTArrayCONUS South2023-07-19 18:03:442023-08-05 22:41:182024-04-03 12:59:39
Playa Lake, TX, USATXX2834.56-102.38USMTArrayCONUS South2023-07-17 21:08:222023-08-05 14:55:002024-04-03 12:59:54
Callaghan Ranch, TX, USATXI3427.87-99.23USMTArrayCONUS South2023-07-15 15:37:242023-08-26 14:24:492024-04-03 12:59:52
Capitol Area, TX, USAREE3630.20-97.23USMTArrayCONUS South2023-07-11 15:44:102023-08-14 02:29:132024-04-03 12:59:45
Oknoname, Oklahoma, USOKU3536.46-96.88USMTArrayCONUS South2023-07-01 23:07:132023-07-15 13:33:102024-04-03 12:59:42
Arroyo Zopilote, TX, USATXJ3427.02-99.43USMTArrayCONUS South2023-07-01 20:03:172023-08-27 14:28:052024-04-03 12:59:53
Galveston Island, TX, USATXF3929.19-94.97USMTArrayCONUS South2023-06-22 21:37:352023-07-17 14:43:352024-04-03 12:59:50
Red River, OK, USAOKX3234.43-99.50USMTArrayCONUS South2023-06-22 16:05:562023-07-06 15:31:082024-04-03 12:59:44
Todd Mission, TX, USATXE3830.23-95.84USMTArrayCONUS South2023-06-21 17:05:512023-07-19 13:14:002024-04-03 12:59:47
San Marcos River, TX, USATXF3629.59-97.58USMTArrayCONUS South2023-06-18 16:23:132023-07-03 13:48:122024-04-03 12:59:49
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
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