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
Paper Citation Required
Unrestricted Release
Academic Use Only
Project
USArray
YSRP
SAGE
UofA
Lithoprobe
CAFE-MT
USGS-GEOMAG
SAMTEX
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
  • USArray
  • YSRP
  • SAGE
  • UofA
  • Lithoprobe
  • CAFE-MT
  • USGS-GEOMAG
  • SAMTEX
  • All
  • Santo Domingo Pueblo
  • Windhoek
  • Southern Alberta Array 2010
  • 2010
  • Stage IV
  • MAK 2006
  • 2014
  • Okavango
  • Red Deer Conductor Array 2008
  • Alberta Array 2010
  • Alberta Array 2008
  • Backbone/Permanent Array
  • WITS 2004
  • Kaapvaal 2003
  • CAFE-MT Wideband
  • British Columbia Array 2009
  • Kaapvaal 2004
  • CAFE-MT Long Period
  • Kimberley 2004
  • Kimberley 2003
  • Alberta Basement
  • Transportable Array
  • 2005-SFR
  • Florida 2015 Long Period
  • Damara Mobile Belt
  • Yellowstone-Snake River Plain
  • Florida 2015 Wideband
  • Southern Alberta Array 2009
  • Kang to Ghazi
  • WITS 2005
  • 2011-2013 BBMT profile
  • Kaapvaal 2005
  • 2005
  • All
  • Paper Citation Required
  • Unrestricted Release
  • Academic Use Only

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: 1983 items found
ppPage: 1 of 20pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)
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, 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
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
Buttons Neck, MD, USAMDO5938.45-76.17USArrayTransportable Array2016-05-13 20:03:592016-06-14 14:20:44
Wicomico Forest, MD, USAMDO6038.35-75.42USArrayTransportable Array2016-05-12 18:54:342016-06-08 13:05:37
Uwharrie River, NC, USARET5635.84-79.96USArrayTransportable Array2016-05-11 19:10:112016-05-29 14:22:41
Tuckahoe Creek, MD, USAMDN5938.99-75.93USArrayTransportable Array2016-05-11 17:45:372016-05-31 16:27:04
Smith Mountain Lake, VA, USAVAR5637.09-79.58USArrayTransportable Array2016-05-09 17:42:592016-06-07 20:59:09
Flint River, GA, USATTY5233.32-84.39USArrayTransportable Array2016-05-03 18:43:002016-05-27 18:19:16
Cacapon Park, WV, USAWVN5639.49-78.32USArrayTransportable Array2016-04-28 22:47:212016-05-18 19:08:30
Snake Hill, WV, USAWVN5439.61-79.82USArrayTransportable Array2016-04-27 20:33:052016-05-18 14:38:22
Canaan Valley, WV, USAWVO5539.13-79.35USArrayTransportable Array2016-04-25 22:13:062016-05-14 05:25:17
North Bend Park, WV, USAWVO5339.22-81.12USArrayTransportable Array2016-04-23 22:06:492016-05-16 14:59:31
Audra Park, WV, USAWVO5439.04-80.07USArrayTransportable Array2016-04-22 19:12:222016-05-16 18:53:36
Beaverdam Branch, NC, USANCU5935.11-77.85USArrayTransportable Array2016-04-20 19:09:422016-05-19 18:55:34
Terrells Creek, NC, USARET5735.81-79.34USArrayTransportable Array2016-04-19 19:53:072016-05-12 21:03:54
Neuse River, NC, USARET5835.70-78.45USArrayTransportable Array2016-04-18 21:34:512016-05-13 14:40:19
Big Creek, NC, USANCU5835.10-78.71USArrayTransportable Array2016-02-16 20:38:232016-02-28 15:42:18
Phils Creek, SC, USASCV5734.73-79.76USArrayTransportable Array2016-02-15 18:54:002016-02-26 17:55:06
Waccamaw River, NC, USANCW5933.96-78.61USArrayTransportable Array2016-02-14 19:12:012016-02-25 21:33:10
Contentnea Creek, NC, USANCT5935.63-77.69USArrayTransportable Array2016-02-13 21:14:212016-02-26 08:04:46
Neuse River, NC, USANCT5835.70-78.45USArrayTransportable Array2016-02-12 20:48:502016-02-27 21:03:04
Cold Springs Mountain, GA, USAREW5134.70-84.70USArrayTransportable Array2016-01-25 22:41:312016-02-12 07:59:19
Triple Springs, NC, USANCS5736.43-78.84USArrayTransportable Array2016-01-12 22:13:212016-01-27 05:28:03
Morrow Mountain, NC, USANCU5635.36-80.09USArrayTransportable Array2016-01-12 18:41:462016-02-17 16:29:10
Gibby Branch Creek, NC, USATTV5235.17-83.70USArrayTransportable Array2016-01-11 21:19:572016-01-26 18:40:57
Bull Neck Swamp, NC, USANCS6035.96-76.40USArrayTransportable Array2016-01-10 20:47:542016-02-08 19:46:44
Lumber River, NC, USANCV5834.47-78.96USArrayTransportable Array2016-01-08 22:30:472016-01-29 16:30:56
Lighthouse, SC, USASCY5832.69-79.89USArrayTransportable Array2016-01-07 18:08:542016-01-28 17:17:26
Goose Creek, NC, USANCT6035.47-76.91USArrayTransportable Array2016-01-06 19:46:512016-01-28 15:54:44
Alligator River, NC, USANCS6135.86-75.96USArrayTransportable Array2015-12-30 17:24:042016-02-02 21:11:11
Cedar Island, NC, USANCU6134.90-76.36USArrayTransportable Array2015-12-29 16:22:482016-01-16 21:46:30
Hofmann Forest, NC, USAREU6034.97-77.35USArrayTransportable Array2015-12-16 19:24:342016-01-07 16:13:28
Shocco Creek, NC, USANCS5836.22-78.06USArrayTransportable Array2015-12-12 22:10:052015-12-20 19:57:33
Santee Wildlife Refuge, SC, USASCX5733.52-80.28USArrayTransportable Array2015-12-11 17:46:102016-01-14 18:59:19
Roanoke River, NC, USANCS5936.23-77.37USArrayTransportable Array2015-12-10 21:30:252015-12-29 21:06:14
Cape Fear, NC, USANCV5934.40-78.11USArrayTransportable Array2015-12-10 20:26:562016-01-04 05:14:55
Hoffman Forest, NC, USANCU6034.98-77.47USArrayTransportable Array2015-12-09 20:11:072015-12-16 20:59:26
Goodwin Forest, NC, USANCU5735.34-79.48USArrayTransportable Array2015-12-09 17:44:532016-01-06 15:45:28
Little Pee Dee, SC, USASCW5834.06-79.38USArrayTransportable Array2015-12-08 16:30:282016-01-13 18:02:00
Buffalo Cove, NC, USARET5436.07-81.50USArrayTransportable Array2015-12-07 21:16:032015-12-19 18:40:44
Longleaf Pine, SC, USASCW5734.00-80.12USArrayTransportable Array2015-12-06 16:56:512015-12-13 15:05:37
Forty Acre Rock, SC, USASCV5634.66-80.52USArrayTransportable Array2015-12-03 20:30:312015-12-27 16:27:51
Little Elk Creek, WV, USAREQ5338.00-81.59USArrayTransportable Array2015-12-02 19:58:542015-12-11 21:52:43
Francis Marion, SC, USASCX5833.28-79.61USArrayTransportable Array2015-11-24 19:13:072015-12-11 20:36:31
Locust Fork, AL, USAREX4934.05-86.49USArrayTransportable Array2015-11-21 20:22:212015-12-23 05:51:54
Turkey Creek, SC, USAREV5534.90-81.34USArrayTransportable Array2015-11-20 20:40:402015-12-13 06:48:06
Beech Branch, SC, USASCY5632.91-81.28USArrayTransportable Array2015-11-17 18:23:492015-12-22 22:05:06
Beaverdam Branch, SC, USASCW5634.28-80.78USArrayTransportable Array2015-11-15 21:46:272015-12-22 16:37:37
WHITE ROCK, NC, USANCT5436.15-81.62USArrayTransportable Array2015-11-15 21:02:352015-11-20 17:45:23
Sessoms Timber, GA, USAGAB5531.14-82.75USArrayTransportable Array2015-11-13 17:18:192015-11-22 18:33:53
Tribble Mill, GA, USATTX5233.90-83.91USArrayTransportable Array2015-11-12 21:03:402015-12-13 21:09:07
COMPTON CREEK, OH, USATTO5339.54-83.32USArrayTransportable Array2015-11-10 17:12:302015-11-21 19:50:01
GOLD HILL, VA, USAVAS5436.61-81.28USArrayTransportable Array2015-11-06 22:49:062015-11-20 22:04:56
Meadow Creek, SC, USATTV5435.04-82.19USArrayTransportable Array2015-11-06 22:17:432015-11-18 20:30:08
Taylor Nursery, SC, USASCX5533.74-81.81USArrayTransportable Array2015-11-05 19:28:032015-11-17 21:36:23
Acadia Cliffs, OH, USAOHO5239.33-81.84USArrayTransportable Array2015-11-04 17:37:292015-11-12 15:15:54
Davis Pond, SC, USASCX5633.52-81.06USArrayTransportable Array2015-11-04 17:06:282015-12-12 19:29:54
Victoria Bluff, SC, USASCZ5732.28-80.81USArrayTransportable Array2015-11-03 18:07:492015-12-05 16:06:21
HILLS and DALES, OH, USAREO4939.71-84.18USArrayTransportable Array2015-11-03 17:16:232015-11-22 17:12:12
Green Pond, SC, USASCY5732.68-80.58USArrayTransportable Array2015-11-02 17:24:162015-11-30 12:40:46
Duck Creek, IN, USAREN4740.36-85.76USArrayTransportable Array2015-11-02 16:33:152015-11-10 11:55:20
CHEIF CORNSTALK, WV, USAWVP5238.73-82.04USArrayTransportable Array2015-11-01 18:01:102015-11-09 21:08:32
Akers Branch, KY, USAKYR5237.46-82.64USArrayTransportable Array2015-10-31 16:44:382015-11-09 16:44:14
Channels Forest, VA, USAVAS5336.85-81.99USArrayTransportable Array2015-10-26 17:20:462015-11-13 19:19:51
South Mountains, NC, USANCU5435.61-81.76USArrayTransportable Array2015-10-25 19:29:102015-11-17 18:10:11
Leepers Creek, NC, USANCU5535.46-81.12USArrayTransportable Array2015-10-22 16:37:062015-11-23 12:14:28
Pisgah Forest, NC, USANCU5335.66-82.44USArrayTransportable Array2015-10-21 21:27:012015-12-06 19:32:00
Nantahala Forest, NC, USANCV5235.17-83.61USArrayTransportable Array2015-10-20 21:14:412015-10-29 15:37:05
Sourdough Ridge, WV, USAWVR5337.39-81.87USArrayTransportable Array2015-10-19 22:33:462015-11-06 15:11:20
Meadow Creek, SC, USAREV5435.04-82.19USArrayTransportable Array2015-10-18 22:18:132015-10-29 15:34:46
East Lynn Lake, WV, USAWVQ5238.05-82.32USArrayTransportable Array2015-10-17 19:00:002015-11-05 15:53:01
Fort Valley Farm, GA, USAGAZ5332.51-83.88USArrayTransportable Array2015-10-17 14:36:462015-10-28 15:40:38
Laurel Branch, WV, USAWVQ5337.97-81.45USArrayTransportable Array2015-10-16 23:13:202015-11-05 20:07:22
ppPage: 1 of 20pp