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
Conditions Apply
Unrestricted Release
Academic Use Only
Paper Citation Required
Project
Ethiopia
USArray
INTERMAGNET
SAGE
GeoscienceAustralia
Lithoprobe
UofAdelaide
Argentina
SAMTEX
YSRP
UofA
CAFE-MT
USGS-GEOMAG
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
  • Ethiopia
  • USArray
  • INTERMAGNET
  • SAGE
  • GeoscienceAustralia
  • Lithoprobe
  • UofAdelaide
  • Argentina
  • SAMTEX
  • YSRP
  • UofA
  • CAFE-MT
  • USGS-GEOMAG
  • All
  • Santo Domingo Pueblo
  • Windhoek
  • Southern Alberta Array 2010
  • Beresford/Warburton complex 2012
  • Paralana
  • Stage IV
  • 2014
  • Red Deer Conductor Array 2008
  • Alberta Array 2008
  • Beresford/Warburton complex 2011
  • Gawler
  • Kimberley 2004
  • Transportable Array
  • 2005-SFR
  • Florida 2015 Long Period
  • Zimbabwe 2005
  • Yellowstone-Snake River Plain
  • Damara Mobile Belt
  • Capricorn Orogen
  • Southern Alberta Array 2009
  • Florida 2015 Wideband
  • Kang to Ghazi
  • Georgina-Arunta
  • WITS 2005
  • JMA
  • 2011-2013 BBMT profile
  • Kaapvaal 2005
  • Southern Delamerian 2010-2012
  • 2005
  • 2010
  • MAK 2006
  • Gawler-Officer-Musgrave-Amadeus
  • Freeling Springs 2012
  • Nepabunna 2010
  • Alberta Array 2010
  • Okavango
  • Backbone/Permanent Array
  • Kaapvaal 2003
  • WITS 2004
  • British Columbia Array 2009
  • CAFE-MT Wideband
  • Curnamona
  • Wabma Kadarbu 2011
  • Kaapvaal 2004
  • Sierras de Cordoba
  • CAFE-MT Long Period
  • Warburton Spring 2012
  • Alberta Basement
  • Kimberley 2003
  • YilgarnCraton-OfficerBasin-Musgrave
  • Aluto-Langano Geothermal
  • All
  • Conditions Apply
  • Unrestricted Release
  • Academic Use Only
  • Paper Citation Required

WARNING: Not all sites have been rotated to geographic coordinates. Please exercise caution particularly when you interpret older transfer functions.
Make sure that site orientation is consistent with your expectations. We are not responsible for misinterpretation of the data.
Query Results: 3001 items found
ppPage: 1 of 31pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)
Bomoseen Lake, VT, USAVTF5943.67-73.24USArrayTransportable Array2016-11-04 16:45:102016-11-11 14:48:49
Hi-Tor, NY, USAREI5542.62-77.36USArrayTransportable Array2016-11-01 18:12:322016-11-11 18:50:42
Altmar Forest, NY, USANYG5643.52-76.08USArrayTransportable Array2016-11-01 16:28:202016-11-12 14:52:38
Pray Meadow, ME, USAMED6144.35-70.52USArrayTransportable Array2016-10-28 20:46:302016-11-08 16:34:06
Nescopeck, PA, USATTK5841.09-75.88USArrayTransportable Array2016-10-28 16:28:292016-11-04 16:22:37
Shaker Forest, NH, USANHF6143.38-71.46USArrayTransportable Array2016-10-27 20:31:282016-11-09 15:55:30
Dark Hollow, PA, USAREL5940.27-75.11USArrayTransportable Array2016-10-25 18:19:432016-11-08 12:35:25
Peekamoose Mountain, NY, USANYI5941.93-74.39USArrayTransportable Array2016-10-25 17:30:222016-11-06 16:14:40
St. Lawrence Seaway, NY, USANYE5644.79-75.34USArrayTransportable Array2016-10-24 16:23:412016-11-11 19:51:27
Moosic Mountains, PA, USAPAJ5841.51-75.48USArrayTransportable Array2016-10-23 19:17:542016-11-10 19:28:55
Ossipee Pine Barrens, NH, USANHE6143.84-71.17USArrayTransportable Array2016-10-21 03:10:102016-11-06 17:53:26
Spruce Run, PA, USAPAK5741.13-76.59USArrayTransportable Array2016-10-20 21:20:002016-10-29 23:24:25
Wyantenock Forest, CT, USACTI6041.79-73.32USArrayTransportable Array2016-10-20 17:04:442016-11-05 18:41:27
Lick Run, PA, USAREK5641.25-77.50USArrayTransportable Array2016-10-19 20:35:582016-11-09 21:10:16
Hickory Run, PA, USAREK5841.02-75.76USArrayTransportable Array2016-10-19 18:11:452016-10-26 19:31:19
Woody Hill, RI, USARII6241.38-71.75USArrayTransportable Array2016-10-19 16:50:062016-11-07 15:24:44
Short Mountain, PA, USATTL5740.58-76.74USArrayTransportable Array2016-10-18 16:33:252016-10-26 12:10:44
Sugar Creek, PA, USAPAK5341.63-79.89USArrayTransportable Array2016-10-14 18:05:492016-10-31 13:02:00
Bullock Run, PA, USAPAL5440.91-79.44USArrayTransportable Array2016-10-13 19:13:162016-11-01 21:38:43
Salmon River, CT, USACTI6141.61-72.47USArrayTransportable Array2016-10-13 17:29:322016-11-01 10:33:39
South Witmer Creek, PA, USAREL5540.73-78.60USArrayTransportable Array2016-10-12 20:37:222016-11-03 19:04:38
Pequea Creek, PA, USAPAM5839.90-76.33USArrayTransportable Array2016-10-12 16:55:002016-10-20 19:27:19
Billets Pond, PA, USAPAJ5741.64-76.35USArrayTransportable Array2016-10-11 21:40:212016-10-30 19:04:49
Cherry Ridge, NY, USANYF5843.84-74.15USArrayTransportable Array2016-10-10 17:07:052016-11-02 19:31:10
East Stony Creek, NY, USANYG5843.27-74.23USArrayTransportable Array2016-10-09 18:08:462016-10-26 14:42:24
Black Brook, NY, USANYE5844.46-73.75USArrayTransportable Array2016-10-08 20:19:562016-10-17 17:24:58
Eldridge Swamp, NY, USANYG5943.06-73.34USArrayTransportable Array2016-10-07 21:36:092016-10-17 20:11:52
St. Regis River, NY, USANYE5744.69-74.56USArrayTransportable Array2016-10-07 21:12:322016-11-02 15:29:40
Pulpit Rock, NY, USANYF5644.31-75.66USArrayTransportable Array2016-10-07 15:28:462016-11-01 19:23:20
Hitchcock Lake, NY, USANYF5743.86-75.00USArrayTransportable Array2016-10-05 19:53:372016-10-16 15:31:55
Smallwood, MD, USATTO5838.56-77.18USArrayTransportable Array2016-10-04 19:17:372016-10-21 09:15:53
Wildwood House, NY, USAREJ6140.96-72.78USArrayTransportable Array2016-09-27 17:01:582016-10-15 16:08:22
Connecticut Hill, NY, USAREI5642.34-76.68USArrayTransportable Array2016-09-26 20:20:022016-10-13 20:38:38
Maple Valley, NY, USANYH5842.66-74.75USArrayTransportable Array2016-09-23 19:11:052016-10-14 17:30:03
Lawson Lake, NY, USANYH5942.53-73.96USArrayTransportable Array2016-09-23 18:35:562016-10-12 14:19:33
Clark Hill, NY, USANYG5743.36-75.30USArrayTransportable Array2016-09-22 19:22:252016-10-14 14:09:08
Earlville Forest, NY, USANYH5742.76-75.59USArrayTransportable Array2016-09-21 20:07:522016-10-05 20:50:50
Canaseraga Forest, NY, USANYI5542.49-77.77USArrayTransportable Array2016-09-20 21:20:502016-09-26 15:57:42
Mill Creek, OH, USAOHK5241.70-80.64USArrayTransportable Array2016-09-06 18:08:332016-09-17 15:09:56
Colliers Mill, NJ, USANJL6040.07-74.43USArrayTransportable Array2016-09-02 18:00:002016-09-26 14:44:04
Collins Pine, PA, USAPAK5441.42-79.16USArrayTransportable Array2016-09-01 20:48:252016-09-25 11:52:42
Colliers Mills, NJ, USANJN6038.96-74.96USArrayTransportable Array2016-09-01 19:18:052016-10-22 16:41:48
Bear Spring, NY, USANYI5842.11-75.09USArrayTransportable Array2016-08-31 21:09:202016-10-02 19:57:04
Fort DuPont, DE, USADEM5939.56-75.59USArrayTransportable Array2016-08-31 19:03:122016-09-10 19:22:57
Tioga State Forest, PA, USAPAJ5641.71-77.02USArrayTransportable Array2016-08-30 19:17:182016-09-09 17:38:57
Gallitzin Forest, PA, USAREM5540.23-78.73USArrayTransportable Array2016-08-29 19:59:402016-09-19 15:23:32
North Harmony Forest, NY, USANYJ5342.11-79.51USArrayTransportable Array2016-08-29 18:24:062016-09-18 19:58:47
Nine Mile Creek, NY, USANYJ5442.14-78.57USArrayTransportable Array2016-08-28 21:00:462016-09-18 17:01:08
Connecticut Hill, NY, USANYI5642.34-76.68USArrayTransportable Array2016-08-27 20:29:122016-10-05 16:43:01
Susquehannock Forest, PA, USAPAJ5541.81-77.82USArrayTransportable Array2016-08-26 20:19:222016-09-15 02:14:43
Wading River, NY, USANYJ6140.92-72.87USArrayTransportable Array2016-08-25 15:55:372016-09-21 18:19:20
Weiser Forest, PA, USAREL5740.53-76.74USArrayTransportable Array2016-08-23 20:24:082016-09-07 12:11:43
Tiadaghton Forest, PA, USAPAK5641.34-77.43USArrayTransportable Array2016-08-19 20:46:412016-09-17 15:16:25
Elk State Forest, PA, USAPAK5541.47-78.18USArrayTransportable Array2016-08-17 22:34:442016-09-02 20:32:55
Gallitzin Forest, PA, USAPAM5540.19-78.76USArrayTransportable Array2016-08-10 17:50:072016-08-22 18:27:18
Monongahela Forest, WV, USAWVP5438.42-80.45USArrayTransportable Array2016-08-08 18:45:552016-08-27 20:17:47
Droddy Hollow, WV, USAWVP5338.65-81.40USArrayTransportable Array2016-08-07 19:35:032016-08-27 16:24:51
Meadow River, WV, USAWVQ5437.90-80.70USArrayTransportable Array2016-08-06 17:36:222016-08-25 17:02:13
Jennings Triangle, PA, USAREL5341.01-80.01USArrayTransportable Array2016-08-02 18:47:422016-09-02 15:50:17
Rothrock Forest, PA, USAPAL5640.70-77.68USArrayTransportable Array2016-07-28 21:00:192016-11-02 19:05:17
Dry Fork, VA, USARER5437.26-80.86USArrayTransportable Array2016-07-26 20:11:052016-08-16 16:35:01
Weiser Forest, PA, USAPAL5740.53-76.75USArrayTransportable Array2016-07-23 19:28:372016-08-10 18:08:44
Michaux Forest, PA, USAPAM5740.01-77.32USArrayTransportable Array2016-07-22 22:24:512016-08-12 06:18:58
Lake Lenape, NJ, USANJM6039.51-74.77USArrayTransportable Array2016-07-20 18:44:002016-08-11 09:44:34
Hickory Run, PA, USAPAK5841.03-75.70USArrayTransportable Array2016-07-19 22:42:042016-08-12 01:57:58
Skippack Creek, PA, USAPAL5940.18-75.41USArrayTransportable Array2016-07-18 20:39:132016-08-09 18:23:03
Raccoon Creek, PA, USAPAM5340.51-80.44USArrayTransportable Array2016-07-14 20:10:152016-08-16 15:29:20
Moraine Park, PA, USAPAL5340.97-80.10USArrayTransportable Array2016-07-12 21:58:422016-08-01 20:32:34
Prince Golitzin Park, PA, USAPAL5540.68-78.52USArrayTransportable Array2016-07-11 20:45:542016-08-24 17:28:45
Doe Creek, VA, USAVAP6037.77-75.73USArrayTransportable Array2016-07-11 19:15:122016-08-01 19:49:52
Smith Ridge, VA, USAVAR6036.58-76.34USArrayTransportable Array2016-07-10 19:19:302016-08-01 15:00:21
Grapevine Ridge, VA, USAVAQ5637.76-79.19USArrayTransportable Array2016-07-08 17:36:522016-07-25 14:26:09
Savage River, MD, USAMDN5539.62-79.10USArrayTransportable Array2016-07-07 19:02:322016-07-17 14:50:58
Douthat Park, VA, USAVAQ5537.88-79.81USArrayTransportable Array2016-07-07 18:12:332016-07-25 17:11:12
Mammoth Park, PA, USAPAM5440.21-79.46USArrayTransportable Array2016-07-06 21:13:552016-07-25 19:39:28
Cowans Gap, PA, USAPAM5639.99-77.93USArrayTransportable Array2016-07-05 21:38:582016-08-22 08:35:18
Dry Fork, VA, USAVAR5437.24-80.92USArrayTransportable Array2016-07-03 18:06:202016-07-14 18:27:24
Dry Fork, VA, USATTS5436.80-81.09USArrayTransportable Array2016-07-02 18:54:402016-07-15 14:38:36
Lake Norman, NC, USALCU5535.65-80.94USArrayTransportable Array2016-06-28 18:19:182016-07-19 14:32:46
Assamoosick Swamp, VA, USAVAR5936.82-77.10USArrayTransportable Array2016-06-24 18:03:512016-07-17 13:17:56
Chilton Woods, VA, USAVAP5937.82-76.52USArrayTransportable Array2016-06-22 19:03:132016-07-02 16:23:11
Frederick Forest, MD, USAREN5739.49-77.48USArrayTransportable Array2016-06-21 20:45:412016-07-10 15:07:24
Seven Bends, VA, USAVAO5638.87-78.48USArrayTransportable Array2016-06-20 21:10:012016-07-10 20:23:51
Chickahominy River, VA, USAVAQ5937.32-76.89USArrayTransportable Array2016-06-16 20:42:482016-07-06 17:02:35
Cumberland Forest, VA, USAVAQ5737.51-78.31USArrayTransportable Array2016-06-13 19:54:532016-07-04 17:45:59
Pocahontas Park, VA, USAVAQ5837.38-77.58USArrayTransportable Array2016-06-10 18:19:062016-06-25 15:46:02
Lake Louise, VA, USAVAP5738.11-78.07USArrayTransportable Array2016-06-07 18:53:062016-06-16 16:28:18
Deep Run Pond, VA, USAVAP5638.27-78.77USArrayTransportable Array2016-06-06 17:21:302016-06-28 14:46:07
Jack Mountain, VA, USAVAP5538.36-79.57USArrayTransportable Array2016-06-04 17:26:312016-06-29 15:28:03
Pacolet River, SC, USALCV5435.11-81.98USArrayTransportable Array2016-06-03 17:04:222016-07-28 15:25:24
Maracossic Creek, VA, USAVAP5838.01-77.29USArrayTransportable Array2016-06-02 19:11:132016-06-16 20:12:57
Fort Lewis Mountain, VA, USAVAR5537.32-80.17USArrayTransportable Array2016-06-01 17:01:422016-06-20 18:02:54
Hidden Valley, VA, USARES5336.85-82.08USArrayTransportable Array2016-05-31 17:48:142016-06-21 15:14:23
Turkey Run, VA, USAVAO5738.66-77.69USArrayTransportable Array2016-05-28 20:52:402016-06-18 15:04:21
Myrtle Grove, MD, USAMDO5838.56-77.07USArrayTransportable Array2016-05-27 20:35:502016-06-18 18:31:59
Eastern Shore, VA, USAVAQ6037.13-75.96USArrayTransportable Array2016-05-23 17:26:142016-06-13 17:29:19
Skyview Lake, NC, USATTT5535.95-80.71USArrayTransportable Array2016-05-21 17:35:052016-06-09 14:34:10
Hickory Cove, VA, USAVAS5536.62-80.41USArrayTransportable Array2016-05-17 19:07:262016-06-08 16:52:26
Chandler Fork, VA, USAVAR5737.01-78.64USArrayTransportable Array2016-05-16 19:56:552016-06-06 18:39:40
Great Creek Lake, VA, USAVAR5836.77-77.88USArrayTransportable Array2016-05-15 21:12:162016-06-07 15:14:24
ppPage: 1 of 31pp