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
Ethiopia
GeoscienceAustralia
INTERMAGNET
Lithoprobe
SAGE
SAMTEX
UofAdelaide
UofAlberta
USArray
USGS-CGGSC
USGS-GEOMAG
YSRP
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
Type
  • Data and Metadata
  • Metadata Only
  • All
  • All
  • Argentina
  • CAFE-MT
  • Ethiopia
  • GeoscienceAustralia
  • INTERMAGNET
  • Lithoprobe
  • SAGE
  • SAMTEX
  • UofAdelaide
  • UofAlberta
  • USArray
  • USGS-CGGSC
  • USGS-GEOMAG
  • YSRP
  • 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
  • Curnamona
  • Damara Mobile Belt
  • 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
  • Kapuskasing Structural Zone
  • Kimberley 2003
  • Kimberley 2004
  • Lithoprobe East
  • MAK 2006
  • NE Namibia 2006
  • Nepabunna 2010
  • North Queensland
  • Okavango
  • Ontario 1992
  • Paralana
  • Pontiac 1990
  • Purcell Overthrust, Belt Basin
  • Red Deer Conductor Array 2008
  • Santo Domingo Pueblo
  • Sierras de Cordoba
  • SN
  • SNORCLE
  • 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
  • Trans-Hudson Orogen Transect
  • Transportable Array
  • Wabma Kadarbu 2011
  • Warburton Spring 2012
  • Western Superior Transect
  • Windhoek
  • WITS 2004
  • WITS 2005
  • Yellowstone-Snake River Plain
  • YilgarnCraton-OfficerBasin-Musgrave
  • Youanmi
  • Zimbabwe 2005
  • All
  • Academic Use Only
  • Conditions Apply
  • Paper Citation Required
  • Unrestricted Release

Happy New Year! We are happy to inform you that on January 3-5, 2018 the EMTF database has undergone a major update. Many issues with the data were fixed, and additional data uploaded.
All data were rotated to geographic coordinates. If you downloaded any data from this database before this update, please now update your files with these new versions.
Detailed change log is available here: (PDF)
Once this database and XML format are documented in a publication, we will provide a link.
Query Results: 4954 items found
ppPage: 1 of 50pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)
Heart River, ND, USANDE2746.59-101.63USArrayTransportable Array2017-10-20 18:52:222017-10-27 05:57:27
New Johns Lake, ND, USANDD2847.38-100.50USArrayTransportable Array2017-10-19 21:16:572017-10-31 17:25:00
Skaneateles Lake, NY, USAREH5642.89-76.42USArrayTransportable Array2017-10-19 19:10:552017-10-31 20:42:46
North Fork Bad River, SD, USASDI2744.10-101.90USArrayTransportable Array2017-10-19 19:05:012017-10-29 17:01:59
Bitter Lake, SD, USASDG3245.25-97.28USArrayTransportable Array2017-10-17 16:35:082017-11-03 17:27:11
Two Horses, ND, USANDF2646.12-102.50USArrayTransportable Array2017-10-16 19:03:282017-10-24 20:23:12
Stratford Slough, SD, USASDG3145.37-98.29USArrayTransportable Array2017-10-16 17:01:132017-10-26 14:59:54
Hague, ND, USANDF2945.99-99.96USArrayTransportable Array2017-10-14 18:54:342017-11-04 17:03:58
Foster Bay, SD, USASDH2844.73-101.06USArrayTransportable Array2017-10-12 19:43:142017-10-31 15:55:16
Scairt Woman Draw, ND, USANDD2547.29-103.36USArrayTransportable Array2017-10-09 18:23:312017-10-29 22:26:44
Four Mile Creek, ND, USANDF2846.04-100.75USArrayTransportable Array2017-10-07 19:30:082017-10-30 18:46:58
Elk Creek, SD, USASDI2644.21-102.91USArrayTransportable Array2017-10-07 18:24:232017-10-28 16:26:13
Bull Run Creek, SD, USASDH2644.79-102.84USArrayTransportable Array2017-10-04 20:08:162017-10-28 18:43:14
North Winds, ND, USANDF2546.03-103.49USArrayTransportable Array2017-10-03 11:00:002017-11-05 18:35:35
Quaboag Pond, MA, USATTH6142.19-72.06USArrayTransportable Array2017-10-02 21:36:042017-10-30 22:06:48
Cherry Creek, SD, USASDH2744.91-101.94USArrayTransportable Array2017-09-23 19:57:002017-10-22 22:00:35
Walworth, SD, USASDG2945.33-99.72USArrayTransportable Array2017-09-22 19:04:002017-10-24 01:48:01
Ipswich, SD, USASDG3045.35-99.10USArrayTransportable Array2017-09-21 20:27:432017-10-11 17:35:33
Tweten Pond, ND, USANDC2947.89-99.34USArrayTransportable Array2017-09-20 22:55:232017-10-13 17:46:15
Cedar Butte, SD, USASDJ2843.53-101.12USArrayTransportable Array2017-09-20 20:19:222017-10-09 17:05:15
Lost Island, ND, USANDC3047.94-98.60USArrayTransportable Array2017-09-19 17:13:372017-10-22 21:50:46
Hilderbrand Creek, SD, USASDH2544.87-103.70USArrayTransportable Array2017-09-18 21:33:592017-10-08 16:20:34
Nikolaisen Pond, ND, USANDB2948.59-99.20USArrayTransportable Array2017-09-18 18:26:252017-10-12 19:19:58
Mitchell Creek, SD, USASDI2844.13-101.23USArrayTransportable Array2017-09-16 19:20:332017-10-08 20:48:11
Butte Creek, SD, USASDJ2943.44-100.46USArrayTransportable Array2017-09-16 00:57:232017-10-05 21:13:13
Vogel Pond, ND, USANDD2947.27-99.53USArrayTransportable Array2017-09-15 21:19:342017-10-06 20:15:04
Hamlin Beach, NY, USANYH5443.37-77.98USArrayTransportable Array2017-09-15 16:27:262017-09-28 16:33:20
Glassface Mountain, ME, USATTD6144.52-70.61USArrayTransportable Array2017-09-13 19:06:322017-09-26 18:18:23
Fairdale Slough, ND, USANDB3048.51-98.23USArrayTransportable Array2017-09-10 21:00:042017-10-05 05:51:06
Scott Cap, SD, USASDG2645.48-102.60USArrayTransportable Array2017-09-10 19:27:252017-09-28 18:21:32
Snake River, SD, USASDG2845.53-100.69USArrayTransportable Array2017-09-09 22:59:482017-09-17 15:41:04
SALANDER MARSH, ND, USANDD3147.34-97.65USArrayTransportable Array2017-09-07 18:29:272017-09-16 22:58:29
Wangum Lake, PA, USATTJ5841.50-75.27USArrayTransportable Array2017-09-07 16:22:172017-09-29 16:44:55
Podhola Pond, ND, USANDF3245.95-97.08USArrayTransportable Array2017-09-06 18:14:022017-09-29 17:31:26
Mud Pond, NY, USANYH5643.00-76.28USArrayTransportable Array2017-09-04 15:51:132017-10-06 20:57:41
Moorehead Lake, ND, USANDC2847.80-100.33USArrayTransportable Array2017-09-01 19:51:532017-09-28 23:18:19
Great Pond, ME, USATTC6344.59-68.64USArrayTransportable Array2017-09-01 19:38:582017-09-11 11:58:21
Christensen Slough, ND, USANDB2648.60-102.27USArrayTransportable Array2017-08-31 20:32:042017-09-20 17:03:55
Lazy M, ND, USANDF3046.00-98.93USArrayTransportable Array2017-08-30 19:33:532017-09-29 20:48:06
Allison Pond, ND, USANDE3046.59-98.85USArrayTransportable Array2017-08-29 18:10:062017-09-21 22:19:19
Pray Meadow, ME, USARED6144.35-70.52USArrayTransportable Array2017-08-28 18:53:032017-09-10 18:26:43
Pochuk Mountain, NY, USANYJ5941.28-74.51USArrayTransportable Array2017-08-26 16:05:382017-09-06 18:37:06
Grand River, SD, USASDG2745.50-101.90USArrayTransportable Array2017-08-25 18:25:252017-09-02 21:34:27
Cedar River, ND, USANDF2746.07-101.58USArrayTransportable Array2017-08-24 21:36:112017-09-15 10:13:44
Viking Prairie, ND, USANDE3246.52-97.10USArrayTransportable Array2017-08-23 18:15:362017-09-12 15:47:35
Chartley Brook, MA, USAREH6241.92-71.23USArrayTransportable Array2017-08-23 16:44:572017-09-19 16:14:23
Emerado Lake, ND, USANDC3147.81-97.35USArrayTransportable Array2017-08-22 17:14:142017-09-10 23:51:49
Rush Lake, ND, USANDC2747.90-101.42USArrayTransportable Array2017-08-19 18:08:252017-09-09 12:49:34
Pultneyville, NY, USANYH5543.28-77.22USArrayTransportable Array2017-08-11 23:01:502017-09-03 21:50:33
Sheyenne River, ND, USANDE3146.50-97.87USArrayTransportable Array2017-08-10 19:22:392017-09-01 16:43:25
Red Lake River, MN, USAMNC3247.88-96.41USArrayTransportable Array2017-08-09 19:51:282017-08-27 15:23:21
North Salt Lake, ND, USANDB3148.53-97.32USArrayTransportable Array2017-08-08 19:36:262017-08-27 18:32:29
Isle La Motte, VT, USAVTD5844.85-73.34USArrayTransportable Array2017-08-08 17:50:472017-09-02 20:13:24
Stutsman, ND, USANDD3047.26-98.84USArrayTransportable Array2017-08-07 19:11:232017-08-28 18:24:41
Booming Ground, ME, USAMEA6345.66-67.72USArrayTransportable Array2017-08-06 19:28:262017-08-31 15:57:36
Clark Salyer, ND, USANDB2848.52-100.40USArrayTransportable Array2017-08-05 18:16:212017-09-08 19:47:21
Little Moose Pond, ME, USAMEB6145.53-69.86USArrayTransportable Array2017-08-04 21:33:242017-08-30 16:24:53
East Park, MN, USAMNB3248.46-96.34USArrayTransportable Array2017-08-03 20:57:522017-09-05 17:49:05
Lobster Cove, ME, USAMEC6444.44-67.90USArrayTransportable Array2017-07-27 19:11:262017-08-07 15:36:01
Brattleboro Forest, VT, USAVTG6042.89-72.62USArrayTransportable Array2017-07-27 16:10:592017-08-16 09:32:56
Ken Lockwood Gorge, NJ, USAREK5940.70-74.87USArrayTransportable Array2017-07-26 17:38:132017-08-11 17:42:53
Grassy Nook Pond, MA, USAMAH6441.75-70.02USArrayTransportable Array2017-07-21 18:59:082017-08-10 18:10:17
Yellow Lake, NY, USATTF5644.31-75.60USArrayTransportable Array2017-07-18 20:07:562017-08-01 14:25:43
Turner Brook, ME, USAMEB6045.60-70.43USArrayTransportable Array2017-07-16 17:38:452017-07-28 19:00:11
Katahdin Forest, ME, USAMEA6146.12-69.43USArrayTransportable Array2017-07-15 18:20:412017-08-16 16:11:35
Depot Stream, ME, USAMEZ6046.82-69.71USArrayTransportable Array2017-07-12 18:52:262017-07-25 15:35:05
Willowdale Forest, MA, USAMAG6242.66-70.90USArrayTransportable Array2017-07-12 17:16:522017-07-20 18:26:22
Norton Brook, ME, USAMEC6144.97-70.28USArrayTransportable Array2017-07-10 19:33:272017-07-28 14:39:19
West Branch, ME, USAMEA6046.26-70.07USArrayTransportable Array2017-07-10 17:50:462017-07-22 00:55:21
Antietam Reservoir, PA, USAPAL5840.35-75.87USArrayTransportable Array2017-07-02 18:21:162017-07-24 14:32:35
Willard Brook, ME, USAMEY6246.98-67.88USArrayTransportable Array2017-06-30 17:26:582017-07-13 05:10:55
Dimock Brook, ME, USAMEY6147.16-68.46USArrayTransportable Array2017-06-29 19:19:552017-07-13 15:41:59
Pratt Lake, ME, USAMEZ6146.65-68.83USArrayTransportable Array2017-06-28 20:15:322017-07-14 15:28:11
Middlefield Forest, MA, USAMAH6042.38-73.04USArrayTransportable Array2017-06-24 18:15:262017-07-14 19:11:27
Baxter Park, ME, USAMEA6245.90-68.77USArrayTransportable Array2017-06-19 18:28:482017-07-09 16:32:54
Birch Point, ME, USAMED6344.04-69.10USArrayTransportable Array2017-06-19 17:29:152017-07-06 19:04:35
Kettle Cove, ME, USAMEE6243.56-70.22USArrayTransportable Array2017-06-17 18:00:292017-07-17 17:03:07
Merrymeeting Bay, ME, USAMED6244.12-69.79USArrayTransportable Array2017-06-13 17:25:192017-06-26 19:10:31
Schoodic Lake, ME, USAMEB6245.35-68.90USArrayTransportable Array2017-06-12 19:05:022017-07-09 20:16:55
Nicatous Lake, ME, USAMEB6345.11-68.12USArrayTransportable Array2017-06-11 19:51:242017-07-07 12:17:56
Rocky Lake, ME, USAMEB6444.87-67.42USArrayTransportable Array2017-06-10 19:10:162017-06-26 19:23:10
Big Cove, ME, USAMEZ6246.52-68.19USArrayTransportable Array2017-05-30 18:53:372017-06-28 14:28:38
Black Creek, ME, USAMEY6047.26-69.37USArrayTransportable Array2017-05-29 19:05:042017-06-13 15:54:19
Hazens Notch, VT, USAVTD5944.84-72.52USArrayTransportable Array2017-05-27 17:18:132017-06-24 18:57:09
Mt Ascutney, VT, USAVTF6043.46-72.42USArrayTransportable Array2017-05-25 21:37:302017-06-21 21:37:19
Camels Hump, VT, USAVTE5944.27-72.93USArrayTransportable Array2017-05-24 19:18:562017-06-21 17:28:47
Bomoseen Park, VT, USAREF5943.67-73.24USArrayTransportable Array2017-05-20 21:24:432017-06-28 19:28:24
De Hart Reservior, PA, USAFTL5740.45-76.77USArrayTransportable Array2017-05-19 18:28:302017-06-17 17:23:16
Raynes Neck, ME, USAMEF6243.11-70.66USArrayTransportable Array2017-05-13 22:14:462017-06-02 11:19:30
Altmar Forest, NY, USAREG5643.52-76.08USArrayTransportable Array2017-05-11 18:15:512017-06-09 14:58:41
Triangle Forest, NY, USATTI5742.39-75.89USArrayTransportable Array2017-05-09 19:07:142017-06-07 20:34:09
Buffalo Creek, NY, USANYI5442.64-78.47USArrayTransportable Array2017-05-08 19:39:012017-05-31 08:32:55
Wildwood Park, NY, USAREJ6241.07-71.89USArrayTransportable Array2017-05-07 15:22:322017-06-05 14:21:13
Connecticut Lakes, NH, USANHC6045.16-71.18USArrayTransportable Array2017-05-04 18:49:302017-05-22 21:23:10
Cape Horn, NH, USANHD6044.56-71.50USArrayTransportable Array2017-05-03 20:10:412017-05-26 08:58:49
Black Mountain Forest, NH, USANHE6044.09-71.94USArrayTransportable Array2017-05-03 15:53:342017-05-22 03:32:33
Indian Brook, MA, USAMAH6341.89-70.55USArrayTransportable Array2017-04-30 18:36:592017-05-31 15:34:40
Thomas Hill, NY, USAREG5843.27-74.16USArrayTransportable Array2017-04-29 17:13:412017-06-02 10:07:11
High Tor, NY, USAREI5542.62-77.35USArrayTransportable Array2017-04-28 18:37:122017-06-03 14:49:49
Spruce Run, PA, USAREK5741.12-76.58USArrayTransportable Array2017-04-27 16:57:212017-06-04 18:34:49
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