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
Data Citation Required
Unrestricted Release
Project
GGGSC
USArray
USGS-GGGSC
USGS-GMEG
USMTArray
UWOSU
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
  • GGGSC
  • USArray
  • USGS-GGGSC
  • USGS-GMEG
  • USMTArray
  • UWOSU
  • All
  • Backbone/Permanent Array
  • CONUS South
  • eKAN
  • SanPabloBay
  • STW
  • Transportable Array
  • YELL
Type
  • Data and Metadata
  • Metadata Only
  • All
  • All
  • Data 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: 1226 items found
ppPage: 1 of 13pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)Last modified (UTC)
Stillwater, MT, USASTW21145.40-110.62USGS-GGGSCSTW2020-10-09 02:00:152020-10-10 15:18:542024-11-21 16:19:31
Stillwater, MT, USASTW20145.26-110.46USGS-GGGSCSTW2020-10-08 23:00:152020-10-10 14:13:172024-11-21 16:19:30
Stillwater, MT, USASTW10145.10-110.61GGGSCSTW2020-10-08 18:00:152020-10-10 17:47:392024-11-19 01:20:43
Stillwater, MT, USASTW10145.10-110.61USGS-GGGSCSTW2020-10-08 18:00:152020-10-10 17:47:392024-11-21 16:25:17
Stillwater, MT, USASTW10645.40-110.19USGS-GGGSCSTW2020-10-07 01:00:152020-10-09 14:29:132024-11-21 16:19:33
Stillwater, MT, USASTW10545.31-110.24USGS-GGGSCSTW2020-10-06 22:00:152020-10-09 14:29:132024-11-21 16:19:33
Stillwater, MT, USASTW20945.66-109.76USGS-GGGSCSTW2020-10-06 01:00:152020-10-07 14:31:052024-11-21 16:19:31
Stillwater, MT, USASTW11745.66-110.14USGS-GGGSCSTW2020-10-05 02:00:152020-10-07 14:29:132024-11-21 16:19:28
Stillwater, MT, USASTW11545.64-110.02USGS-GGGSCSTW2020-10-04 22:00:152020-10-07 14:29:132024-11-21 16:19:28
Stillwater, MT, USASTW10445.21-110.24USGS-GGGSCSTW2020-10-03 23:00:152020-10-06 14:29:132024-11-21 16:19:33
Stillwater, MT, USASTW11645.57-109.88USGS-GGGSCSTW2020-10-03 01:00:152020-10-05 14:29:132024-11-21 16:19:28
Stillwater, MT, USASTW12045.92-109.75USGS-GGGSCSTW2020-10-02 19:00:152020-10-05 06:29:132024-11-21 16:19:29
Stillwater, MT, USASTW12345.67-109.52USGS-GGGSCSTW2020-10-02 01:00:152020-10-04 14:29:132024-11-21 16:19:29
Stillwater, MT, USASTW12545.75-109.27USGS-GGGSCSTW2020-10-01 19:00:152020-10-04 06:29:132024-11-21 16:19:30
South Creek, UT, USARER1538.18-112.57USMTArrayCONUS South2020-10-01 18:39:092020-11-22 16:25:182024-10-30 22:07:38
Stillwater, MT, USASTW11845.70-109.95USGS-GGGSCSTW2020-10-01 01:00:152020-10-03 14:29:132024-11-21 16:19:28
Stillwater, MT, USASTW20845.79-109.66USGS-GGGSCSTW2020-09-30 22:00:152020-10-02 19:49:502024-11-21 16:19:31
Stillwater, MT, USASTW21345.97-109.93USGS-GGGSCSTW2020-09-30 19:00:152020-10-02 14:29:132024-11-21 16:19:32
Stillwater, MT, USASTW21445.61-109.44USGS-GGGSCSTW2020-09-30 00:00:152020-10-01 20:00:282024-11-21 16:19:32
Stillwater, MT, USASTW21045.74-109.13USGS-GGGSCSTW2020-09-29 20:00:152020-10-01 14:31:052024-11-21 16:19:31
Stillwater, MT, USASTW10745.53-110.53USGS-GGGSCSTW2020-09-25 22:00:152020-09-27 00:17:202024-11-21 16:19:26
Stillwater, MT, USASTW20745.93-109.37USGS-GGGSCSTW2020-09-25 02:00:152020-09-26 04:42:582024-11-21 16:19:31
Stillwater, MT, USASTW12145.54-109.69USGS-GGGSCSTW2020-09-24 23:00:152020-09-26 21:36:052024-11-21 16:19:29
Stillwater, MT, USASTW11445.49-109.92USGS-GGGSCSTW2020-09-24 18:00:152020-09-26 18:46:052024-11-21 16:19:27
Stillwater, MT, USASTW11045.45-110.03USGS-GGGSCSTW2020-09-24 01:00:152020-09-26 14:29:132024-11-21 16:19:27
Stillwater, MT, USASTW11145.37-109.89USGS-GGGSCSTW2020-09-22 23:00:152020-09-24 18:30:092024-11-21 16:19:27
Stillwater, MT, USASTW20645.62-109.08USGS-GGGSCSTW2020-09-22 19:00:152020-09-25 06:29:132024-11-21 16:19:30
Stillwater, MT, USASTW10845.25-109.72USGS-GGGSCSTW2020-09-22 00:00:152020-09-23 17:58:172024-11-21 16:19:26
Stillwater, MT, USASTW11245.38-109.69USGS-GGGSCSTW2020-09-21 20:00:152020-09-23 16:06:432024-11-21 16:19:27
Stillwater, MT, USASTW21545.23-109.39USGS-GGGSCSTW2020-09-21 01:00:152020-09-23 00:22:392024-11-21 16:19:32
Stillwater, MT, USASTW12245.47-109.45USGS-GGGSCSTW2020-09-20 22:00:152020-09-22 15:02:582024-11-21 16:19:29
Stillwater, MT, USASTW12445.35-109.44USGS-GGGSCSTW2020-09-20 17:00:152020-09-22 14:18:352024-11-21 16:19:29
Stillwater, MT, USASTW21245.36-109.08USGS-GGGSCSTW2020-09-19 21:00:152020-09-21 14:52:202024-11-21 16:19:32
Stillwater, MT, USASTW20545.45-109.20USGS-GGGSCSTW2020-09-19 18:00:152020-09-21 14:23:542024-11-21 16:19:30
Stillwater, MT, USASTW11945.75-109.89USGS-GGGSCSTW2020-09-18 01:00:152020-09-20 01:15:472024-11-21 16:19:28
Stillwater, MT, USASTW11345.54-110.08USGS-GGGSCSTW2020-09-17 22:00:152020-09-19 23:02:582024-11-21 16:19:27
Stillwater, MT, USASTW12645.53-109.21USGS-GGGSCSTW2020-09-17 01:00:152020-09-18 21:57:202024-11-21 16:19:30
Stillwater, MT, USASTW20445.17-109.50USGS-GGGSCSTW2020-09-16 19:00:152020-09-19 02:14:132024-11-21 16:19:30
Stillwater, MT, USASTW10345.05-109.42USGS-GGGSCSTW2020-09-16 01:00:152020-09-18 14:29:132024-11-21 16:19:33
Stillwater, MT, USASTW10245.08-110.00USGS-GGGSCSTW2020-09-15 19:00:152020-09-18 06:29:132024-11-21 16:19:33
North Fork Soloman River, KS, USAKSP3139.61-99.43USArrayTransportable Array2018-11-02 18:08:452018-11-10 15:08:542024-08-09 20:24:51
St. Francis, KS, USAKSP2839.67-101.69USArrayTransportable Array2018-11-01 19:20:002018-11-11 16:59:292024-08-09 20:24:28
South Sacramento WMA, NE, USANEO3140.32-99.24USArrayTransportable Array2018-11-01 18:31:552018-11-10 17:45:592024-08-09 20:38:44
Sedgwick, CO, USACON2740.98-102.55USArrayTransportable Array2018-10-31 20:06:312018-11-10 19:29:562024-08-09 20:22:36
Atwood, KS, KS, USAKSP2939.70-101.04USArrayTransportable Array2018-10-31 19:51:182018-11-10 21:42:372024-08-09 20:24:36
Haxtun, CO, USACOO2740.40-102.74USArrayTransportable Array2018-10-31 00:43:332018-11-10 21:55:422024-08-09 20:23:13
Joes, CO, CO, USACOP2739.76-102.59USArrayTransportable Array2018-10-30 23:12:002018-11-11 19:51:462024-08-09 20:23:51
Lenora, KS, USAKSP3039.68-100.03USArrayTransportable Array2018-10-28 20:25:312018-11-09 19:31:292024-08-09 20:24:43
Bar-Bee Lake Reservoir, CO, USACOO2240.18-106.76USArrayTransportable Array2018-10-28 20:03:062018-11-12 20:29:042024-08-09 20:22:44
Saline River, KS, USAKSQ3139.12-99.48USArrayTransportable Array2018-10-27 22:35:012018-11-09 23:15:592024-08-09 20:25:06
Medicine Rock, MT, USAREF2446.01-104.49USArrayTransportable Array2018-10-24 22:54:122018-11-07 18:32:252024-08-09 20:39:37
Parshall SE, ND, USANDC2647.85-102.11USArrayTransportable Array2018-10-20 00:17:542018-11-04 21:55:212024-08-09 20:31:10
Wollman WPA, SD, USASDH3144.72-98.27USArrayTransportable Array2018-10-15 17:25:182018-10-27 15:03:572024-08-09 20:42:00
Rosebud Creek, MT, USAMTF2245.93-106.38USArrayTransportable Array2018-10-13 19:09:482018-11-06 05:48:572024-08-09 20:29:30
Mills WPA, SD, USASDI3044.19-99.11USArrayTransportable Array2018-10-12 22:55:042018-10-26 23:21:592024-08-09 20:42:53
Alkaline Lake, ND, USANDE2946.69-99.64USArrayTransportable Array2018-10-11 19:33:592018-10-26 16:20:222024-08-09 20:33:17
Angela, MT, USAMTE2246.62-106.08USArrayTransportable Array2018-10-11 19:16:172018-11-05 23:18:032024-08-09 20:29:07
Garrison Dam, ND, USANDD2747.42-101.44USArrayTransportable Array2018-10-10 20:11:232018-11-04 18:38:512024-08-09 20:32:10
Lake Fort Peck, MT, USAMTC2247.79-105.88USArrayTransportable Array2018-10-09 21:20:042018-11-05 18:53:502024-08-09 20:28:22
Demicks Lake, ND, USANDC2547.99-103.23USArrayTransportable Array2018-10-09 20:01:512018-10-23 23:59:062024-08-09 20:31:02
Sand creek, MT, USAMTF2345.93-105.38USArrayTransportable Array2018-10-08 23:07:172018-10-21 16:51:482024-08-09 20:29:37
Big Lagoon, KS, USAKSQ2839.02-101.98USArrayTransportable Array2018-10-06 19:10:562018-10-22 19:56:512024-08-09 20:24:58
Finger Buttes, MT, USAMTG2445.31-104.49USArrayTransportable Array2018-10-05 21:10:162018-10-14 19:20:372024-08-09 20:30:00
Calhan, CO, USACOQ2539.13-104.35USArrayTransportable Array2018-10-04 20:04:542018-10-17 00:29:592024-08-09 20:24:13
Drop Tube Reservoir, MT, USAMTG2245.40-106.18USArrayTransportable Array2018-10-02 20:56:032018-10-13 22:03:542024-08-09 20:29:45
Rochford, SD, USASDI2544.11-103.77USArrayTransportable Array2018-09-29 20:20:112018-10-12 16:59:182024-08-09 20:42:16
Sioux Pass, MT, USAMTC2448.01-104.24USArrayTransportable Array2018-09-26 20:07:502018-10-16 03:09:402024-08-09 20:28:37
Grover, CO, USACON2540.88-104.14USArrayTransportable Array2018-09-26 00:14:432018-10-16 16:58:002024-08-09 20:22:20
Waters Reservoir, MT, USAMTC2347.92-105.15USArrayTransportable Array2018-09-25 18:58:152018-10-16 04:52:562024-08-09 20:28:29
Flat Top, MT, USAMTE2346.65-105.19USArrayTransportable Array2018-09-23 20:18:282018-10-04 20:36:292024-08-09 20:29:15
Riverside Reservoir, CO, USACOO2540.45-104.28USArrayTransportable Array2018-09-22 23:38:292018-10-07 15:07:072024-08-09 20:22:58
Last Chance, MT, USAMTD2247.18-106.07USArrayTransportable Array2018-09-21 19:40:552018-10-04 17:34:542024-08-09 20:28:44
Bennett, CO, USACOP2539.81-104.38USArrayTransportable Array2018-09-21 00:56:512018-10-13 21:27:542024-08-09 20:23:36
Last Buffalo Peak, CO, USACOQ2338.96-106.00USArrayTransportable Array2018-09-20 01:20:262018-10-03 20:16:392024-08-09 20:23:58
Willow Creek, MT, USAMTB2448.53-104.05USArrayTransportable Array2018-09-19 22:14:122018-09-30 19:19:202024-08-09 20:28:14
Signal Butte, CO, USACOQ2439.01-105.22USArrayTransportable Array2018-09-18 20:39:582018-10-03 17:39:432024-08-09 20:24:06
Robinson Flats, SD, USASDJ2543.45-103.82USArrayTransportable Array2018-09-15 22:18:032018-10-10 19:02:232024-08-09 20:43:17
Big Meadow, ND, USANDB2548.56-103.03USArrayTransportable Array2018-09-13 19:34:542018-10-07 18:05:132024-08-09 20:30:09
Tiny Town, CO, USACOP2439.61-105.21USArrayTransportable Array2018-09-13 14:32:062018-10-01 06:27:332024-08-09 20:23:28
Carter Lake Reservoir, CO, USACOO2440.31-105.24USArrayTransportable Array2018-09-12 00:25:422018-10-01 22:40:252024-08-09 20:22:51
North Sterling Reservoir, CO, USACON2640.87-103.34USArrayTransportable Array2018-09-09 23:09:282018-09-24 18:52:182024-08-09 20:22:28
Nemont, MT, US, MT, USAMTB2348.59-105.09USArrayTransportable Array2018-09-08 17:31:072018-09-22 17:49:342024-08-09 20:28:07
Parson Creek, MT, USAMTD2447.23-104.21USArrayTransportable Array2018-09-04 18:31:572018-09-17 21:17:182024-08-09 20:28:59
St Olaf, ND, USANDB2748.50-101.03USArrayTransportable Array2018-08-31 17:30:512018-09-18 18:59:262024-08-09 20:30:24
Hellcreek, MT, USAMTB2248.62-105.98USArrayTransportable Array2018-08-20 02:11:042018-09-12 16:52:352024-08-09 20:27:59
Hillrose, CO, USACOO2640.27-103.37USArrayTransportable Array2018-08-19 20:10:412018-09-04 05:29:282024-08-09 20:23:06
Malkuch Reservoir, MT, USAMTD2347.19-105.16USArrayTransportable Array2018-08-17 20:56:562018-09-11 16:50:412024-08-09 20:28:52
Last Chance, CO, USACOP2639.71-103.65USArrayTransportable Array2018-08-15 23:39:192018-09-14 20:54:052024-08-09 20:23:43
Eagle, CO, USACOP2239.72-106.89USArrayTransportable Array2018-08-14 22:38:092018-08-27 21:17:012024-08-09 20:23:21
Norfolk, CO, USACON2440.91-105.07USArrayTransportable Array2018-08-12 23:03:532018-08-29 16:36:352024-08-09 20:22:13
Beaver Creek, MT, USAMTE2446.75-104.24USArrayTransportable Array2018-08-11 20:47:402018-08-23 22:31:232024-08-09 20:29:22
Little Powder River, MT, USAMTG2345.35-105.37USArrayTransportable Array2018-08-09 20:49:252018-09-07 18:11:492024-08-09 20:29:53
Giedd, SD, USASDH3244.79-97.48USArrayTransportable Array2018-08-05 05:55:002018-08-16 15:24:482024-08-09 20:42:08
Kennaday Peak, WY, USAWYM2241.45-106.56USArrayTransportable Array2018-08-03 20:59:562018-09-13 21:55:452024-08-09 20:46:56
Furnstahl, SD, USASDI3244.17-97.58USArrayTransportable Array2018-08-02 19:50:302018-08-15 17:54:302024-08-09 20:43:08
Jackson, SD, USASDI3144.01-98.40USArrayTransportable Array2018-08-01 22:27:272018-08-28 22:24:022024-08-09 20:43:00
Broken Arrow, SD, USASDJ3143.47-98.70USArrayTransportable Array2018-08-01 17:55:312018-08-28 20:05:012024-08-09 20:43:55
Rocky Ridge, ND, USANDE2546.63-103.24USArrayTransportable Array2018-07-27 21:28:312018-08-09 17:03:242024-08-09 20:32:47
Seibert, CO, USACOQ2739.14-102.82USArrayTransportable Array2018-07-21 21:29:542018-08-14 23:44:312024-08-09 20:24:21
Red River Valley, MN, USAMND3247.22-96.63USArrayTransportable Array2018-07-21 19:12:422018-08-04 19:49:122024-08-09 20:27:52
ppPage: 1 of 13pp