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


Download request too large

Requested download count exceeds maximum size (200) for this product.

EM Transfer Function Product Query icon
Your session is about to expire!

Your session will expire in seconds.

Do you wish to continue?

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
CostaRica
EMSOC
Ethiopia
FU-BERLIN
GeoscienceAustralia
INTERMAGNET
Lithoprobe
MAGIC
MOCHA
PRIDE
SAGE
SAMTEX
UofAdelaide
UofAlberta
USArray
USGS-CGGSC
USGS-GEOMAG
USMTArray
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
  • All
  • Argentina
  • CAFE-MT
  • CostaRica
  • EMSOC
  • Ethiopia
  • FU-BERLIN
  • GeoscienceAustralia
  • INTERMAGNET
  • Lithoprobe
  • MAGIC
  • MOCHA
  • PRIDE
  • SAGE
  • SAMTEX
  • UofAdelaide
  • UofAlberta
  • USArray
  • USGS-CGGSC
  • USGS-GEOMAG
  • USMTArray
  • YSRP
  • All
  • 2005
  • 2005-SFR
  • 2008
  • 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
  • Costa Rica
  • 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
  • Kansas 2017 Long Period
  • Kapuskasing Structural Zone
  • Kimberley 2003
  • Kimberley 2004
  • Kyrgyzstan-China MANAS
  • Lithoprobe East
  • MAGIC
  • MAK 2006
  • MOCHA-land
  • NE Namibia 2006
  • Nepabunna 2010
  • Nicaragua
  • North Chile Central Altiplano
  • North Queensland
  • Okavango
  • Ontario 1992
  • Paralana
  • Payun
  • Pontiac 1990
  • Purcell Overthrust, Belt Basin
  • Red Deer Conductor Array 2008
  • San Andreas Fault
  • Santo Domingo Pueblo
  • Sierra Nevada
  • Sierras de Cordoba
  • SN
  • SNORCLE
  • SOCAL
  • 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
  • Tian Shan 1999
  • 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
  • ZAM
  • Zimbabwe 2005
Type
  • Data and Metadata
  • Metadata Only
  • All
  • All
  • Academic Use Only
  • Conditions Apply
  • Paper Citation Required
  • Unrestricted Release

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: 5694 items found
ppPage: 1 of 57pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)Last modified (UTC)
Mazourka Canyon, CA, USACAT0836.84-118.09USMTArraySOCAL2019-11-15 21:35:132019-12-05 16:51:022020-01-29 19:01:03
Soledad Canyon, CA, USACAX0834.47-118.10USMTArraySOCAL2019-11-14 22:14:502019-12-04 16:47:102020-01-29 19:11:19
California City, CA, USACAW0835.07-118.00USMTArraySOCAL2019-11-14 17:48:272019-12-04 20:11:282020-01-29 19:17:56
Mt. Madonna, CA, USACAT0337.02-121.70USMTArraySOCAL2019-11-08 22:45:442019-12-06 16:46:512020-01-29 19:20:10
Cook Canyon, CA, USACAR0338.27-122.15USMTArraySOCAL2019-11-06 20:15:412019-12-06 21:42:142020-01-29 19:04:08
Water Valley, CA, USACAW0935.09-117.12USMTArraySOCAL2019-11-05 21:23:032019-11-29 07:36:012020-01-29 19:05:56
Jameson Lake, CA, USACAX0634.49-119.49USMTArraySOCAL2019-11-05 00:39:182019-12-03 17:19:482020-01-29 18:59:01
Merriam Mountains, CA, USACAZ0933.17-116.98USMTArraySOCAL2019-11-03 21:16:182019-11-24 16:35:552020-01-29 19:00:26
Cross Creek, CA, USACAU0636.29-119.58USMTArraySOCAL2019-10-31 12:00:002019-11-20 16:49:302020-01-29 18:56:16
Tulare Lake, CA, USACAV0635.80-119.62USMTArraySOCAL2019-10-30 19:48:002019-11-12 19:41:062020-01-29 19:15:41
Kelso Wash, CA, USACAW1135.09-115.57USMTArraySOCAL2019-10-28 21:06:342019-11-21 23:01:252020-01-29 19:23:40
Pleasanton Ridge, CA, USACAS0337.66-121.96USMTArraySOCAL2019-10-24 22:07:082019-11-08 00:49:322020-01-29 19:50:27
Anza Borrego Desert, CA, USACAZ1033.14-116.24USMTArraySOCAL2019-10-21 19:25:112019-11-13 19:35:052020-01-29 18:58:28
Greenwater Range, CA, USAREU1036.22-116.45USMTArraySOCAL2019-10-19 20:30:172019-11-21 18:51:502020-01-29 19:18:53
Williams Canyon, CA, USAREU0936.24-117.26USMTArraySOCAL2019-10-18 19:34:482019-11-08 00:01:062020-01-29 19:25:58
Bruce Spring, CA, USACAV0535.67-120.24USMTArraySOCAL2019-10-16 18:35:242019-11-07 16:49:122020-01-29 19:17:18
McCoy Mountain, CA, USAREY1233.82-114.91USMTArraySOCAL2019-10-13 19:17:382019-11-02 22:41:362020-01-29 19:03:34
Indio Hills, CA, USACAY1033.87-116.31USMTArraySOCAL2019-10-11 22:12:002019-11-01 23:18:322020-01-29 19:20:50
Lakeview Mountains, CA, USACAY0933.73-117.23USMTArraySOCAL2019-10-10 21:40:132019-11-01 16:21:442020-01-29 19:23:02
Bald Mountain, CA, USACAW0535.14-120.32USMTArraySOCAL2019-10-06 03:12:482019-10-26 17:46:022020-01-29 19:13:47
Twentynine Palms, CA, USATTX1134.44-115.76USMTArraySOCAL2019-10-03 22:30:512019-10-28 16:56:352020-01-29 19:16:40
Spikes Peak, CA, USACAT0437.04-121.23USMTArraySOCAL2019-09-28 00:49:332019-10-23 19:51:282020-01-29 19:02:10
Joshua Tree, CA, USACAY1133.73-115.83USMTArraySOCAL2019-09-27 00:16:452019-10-17 17:05:292020-01-29 18:57:54
Carrizo Plain, CA, USACAW0635.08-119.55USMTArraySOCAL2019-09-20 04:51:232019-10-14 23:24:272020-01-29 19:01:36
Cosumnes River, CA, USARER0438.27-121.37USMTArraySOCAL2019-09-11 21:59:442019-10-02 16:47:012020-01-29 19:06:35
Walker Creek Ranch, CA, USACAR0238.18-122.81USMTArraySOCAL2019-08-31 20:18:562019-09-22 21:35:522020-01-29 19:19:32
Bodie Bluff, CA, USACAR0738.16-118.92USMTArraySOCAL2019-08-25 20:45:132019-09-16 16:29:342020-01-29 19:15:03
Timber Trails, CA, USARER0538.20-120.41USMTArraySOCAL2019-08-24 20:49:112019-09-04 17:52:542020-01-29 19:25:38
Donut Rock, CA, USACAU0536.26-120.42USMTArraySOCAL2019-08-19 21:55:422019-09-09 20:02:122020-01-29 19:24:19
Schmieder Bank, CA, USACAU0336.28-121.85USMTArraySOCAL2019-08-13 22:58:332019-09-02 16:54:302020-01-29 19:02:44
Whitmore Hot Springs, CA, USACAS0737.66-118.81USMTArraySOCAL2019-08-10 16:56:472019-09-05 18:49:522020-01-29 19:11:59
Hickman Creek, CA, USACAU0736.18-118.83USMTArraySOCAL2019-08-05 19:52:292019-09-07 17:33:152020-01-29 19:09:43
Topo Creek, CA, USACAU0436.40-121.16USMTArraySOCAL2019-08-01 00:52:582019-08-21 15:52:172020-01-29 19:13:10
Turlock Lake, CA, USACAS0537.62-120.57USMTArraySOCAL2019-07-30 20:17:042019-09-10 18:09:202020-01-29 19:18:16
Cambria, CA, USACAV0435.61-121.12USMTArraySOCAL2019-07-25 23:34:462019-08-14 14:47:522020-01-29 18:59:35
Amboy, CA, USAREX1134.42-115.71USMTArraySOCAL2019-07-21 17:00:282019-08-11 15:37:292020-01-29 19:10:04
Arnold, CA, USACAR0538.25-120.38USMTArraySOCAL2019-07-17 21:32:002019-08-07 15:15:032020-01-29 19:24:39
Donnell Lake, CA, USACAR0638.31-119.91USMTArraySOCAL2019-07-16 20:33:512019-08-07 20:00:542020-01-29 19:07:10
MISQ, CA, USACAY0833.73-117.94USMTArraySOCAL2019-07-12 19:58:542019-07-23 15:52:142020-01-29 19:00:08
Hidden Valley, CA, USACAW1034.97-116.35USMTArraySOCAL2019-07-10 20:39:172019-08-02 16:31:202020-01-29 19:08:09
Buckingham Mountain, CA, USACAS0637.54-119.86USMTArraySOCAL2019-07-05 21:55:022019-08-07 01:06:542020-01-29 19:16:02
Hoffman Mountain, CA, USACAT0736.97-118.95USMTArraySOCAL2019-07-04 21:22:392019-08-06 19:25:442020-01-29 19:12:20
Amboy, CA, USACAX1134.42-115.71USMTArraySOCAL2019-06-29 18:53:532019-07-09 17:48:092020-01-29 19:22:42
Monache Meadows, CA, USACAU0836.22-118.18USMTArraySOCAL2019-06-27 01:49:372019-07-18 22:14:012020-01-29 19:04:42
Sonny Bono, CA, USACAZ1133.08-115.71USMTArraySOCAL2019-06-17 17:36:012019-07-20 16:20:192020-01-29 18:57:08
Lake Piru, CA, USACAX0734.51-118.77USMTArraySOCAL2019-06-06 21:58:392019-06-25 16:16:192020-01-29 19:07:31
Panamint Valley, CA, USACAU0936.24-117.37USMTArraySOCAL2019-05-16 19:14:012019-06-22 16:43:362020-01-29 19:24:59
Amargosa Opera, CA, USACAU1036.30-116.45USMTArraySOCAL2019-05-15 18:19:052019-06-22 20:11:592020-01-29 19:05:19
Dumont Dunes, CA, USACAV1035.69-116.30USMTArraySOCAL2019-05-14 17:10:172019-06-23 15:39:502020-01-29 19:10:41
Mesquite Pass, CA, USACAV1135.72-115.64USMTArraySOCAL2019-05-13 18:50:302019-07-01 16:37:542020-01-29 19:08:47
Fort Piute, CA, USACAW1235.08-114.99USMTArraySOCAL2019-05-12 20:53:282019-06-24 16:43:452020-01-29 19:21:28
Turtle Mountain, CA, USACAX1234.40-115.04USMTArraySOCAL2019-05-11 20:02:052019-06-20 08:27:502020-01-29 18:56:34
Ord Mountains, CA, USACAX0934.39-117.15USMTArraySOCAL2019-05-10 20:53:342019-06-20 17:11:582020-01-29 19:14:25
Spy Mountain, CA, USACAX1034.31-116.41USMTArraySOCAL2019-05-09 17:55:582019-06-09 17:20:112020-01-29 18:55:23
Palen Mountains, CA, USACAY1233.73-114.99USMTArraySOCAL2019-05-08 20:55:572019-06-19 17:09:252020-01-29 18:54:00
Mount Barrow, CA, USACAZ1233.18-114.94USMTArraySOCAL2019-05-07 22:26:572019-06-16 17:32:162020-01-29 18:54:34
The Meadows Slough, CA, USACAR0438.25-121.49USMTArraySOCAL2019-05-03 22:29:402019-05-09 00:25:422020-01-29 19:03:16
North Fork Soloman River, KS, USAKSP3139.61-99.43USArrayTransportable Array2018-11-02 18:08:452018-11-10 15:08:542019-01-24 10:25:36
St. Francis, KS, USAKSP2839.67-101.69USArrayTransportable Array2018-11-01 19:20:002018-11-11 16:59:292019-01-24 10:41:33
South Sacramento WMA, NE, USANEO3140.32-99.24USArrayTransportable Array2018-11-01 18:31:552018-11-10 17:45:592019-01-24 11:07:44
Sedgwick, CO, USACON2740.98-102.55USArrayTransportable Array2018-10-31 20:06:312018-11-10 19:29:562019-01-24 10:31:07
Atwood, KS, KS, USAKSP2939.70-101.04USArrayTransportable Array2018-10-31 19:51:182018-11-10 21:42:372019-01-24 11:05:17
Haxtun, CO, USACOO2740.40-102.74USArrayTransportable Array2018-10-31 00:43:332018-11-10 21:55:422019-01-24 10:32:02
Joes, CO, CO, USACOP2739.76-102.59USArrayTransportable Array2018-10-30 23:12:002018-11-11 19:51:462019-01-24 10:41:14
Lenora, KS, USAKSP3039.68-100.03USArrayTransportable Array2018-10-28 20:25:312018-11-09 19:31:292019-01-24 10:58:30
Bar-Bee Lake Reservoir, CO, USACOO2240.18-106.76USArrayTransportable Array2018-10-28 20:03:062018-11-12 20:29:042019-01-24 10:59:25
Saline River, KS, USAKSQ3139.12-99.48USArrayTransportable Array2018-10-27 22:35:012018-11-09 23:15:592019-01-24 10:39:42
Medicine Rock, MT, USAREF2446.01-104.49USArrayTransportable Array2018-10-24 22:54:122018-11-07 18:32:252019-01-24 10:42:30
Parshall SE, ND, USANDC2647.85-102.11USArrayTransportable Array2018-10-20 00:17:542018-11-04 21:55:212019-01-24 10:57:51
Wollman WPA, SD, USASDH3144.72-98.27USArrayTransportable Array2018-10-15 17:25:182018-10-27 15:03:572019-01-24 11:01:56
Rosebud Creek, MT, USAMTF2245.93-106.38USArrayTransportable Array2018-10-13 19:09:482018-11-06 05:48:572019-01-24 11:10:29
Mills WPA, SD, USASDI3044.19-99.11USArrayTransportable Array2018-10-12 22:55:042018-10-26 23:21:592019-01-24 11:05:36
Alkaline Lake, ND, USANDE2946.69-99.64USArrayTransportable Array2018-10-11 19:33:592018-10-26 16:20:222019-01-24 10:32:59
Angela, MT, USAMTE2246.62-106.08USArrayTransportable Array2018-10-11 19:16:172018-11-05 23:18:032019-01-24 10:56:19
Garrison Dam, ND, USANDD2747.42-101.44USArrayTransportable Array2018-10-10 20:11:232018-11-04 18:38:512019-01-24 10:55:05
Lake Fort Peck, MT, USAMTC2247.79-105.88USArrayTransportable Array2018-10-09 21:20:042018-11-05 18:53:502019-01-24 11:00:41
Demicks Lake, ND, USANDC2547.99-103.23USArrayTransportable Array2018-10-09 20:01:512018-10-23 23:59:062019-01-24 11:11:43
Sand creek, MT, USAMTF2345.93-105.38USArrayTransportable Array2018-10-08 23:07:172018-10-21 16:51:482019-01-24 10:43:08
Big Lagoon, KS, USAKSQ2839.02-101.98USArrayTransportable Array2018-10-06 19:10:562018-10-22 19:56:512019-01-24 10:34:50
Finger Buttes, MT, USAMTG2445.31-104.49USArrayTransportable Array2018-10-05 21:10:162018-10-14 19:20:372019-01-24 11:01:00
Calhan, CO, USACOQ2539.13-104.35USArrayTransportable Array2018-10-04 20:04:542018-10-17 00:29:592019-01-24 10:44:03
Drop Tube Reservoir, MT, USAMTG2245.40-106.18USArrayTransportable Array2018-10-02 20:56:032018-10-13 22:03:542019-01-24 10:50:27
Rochford, SD, USASDI2544.11-103.77USArrayTransportable Array2018-09-29 20:20:112018-10-12 16:59:182019-01-24 10:25:55
Sioux Pass, MT, USAMTC2448.01-104.24USArrayTransportable Array2018-09-26 20:07:502018-10-16 03:09:402019-01-24 11:03:27
Grover, CO, USACON2540.88-104.14USArrayTransportable Array2018-09-26 00:14:432018-10-16 16:58:002019-01-24 10:49:32
Waters Reservoir, MT, USAMTC2347.92-105.15USArrayTransportable Array2018-09-25 18:58:152018-10-16 04:52:562019-01-24 10:37:16
Flat Top, MT, USAMTE2346.65-105.19USArrayTransportable Array2018-09-23 20:18:282018-10-04 20:36:292019-01-24 10:52:18
Riverside Reservoir, CO, USACOO2540.45-104.28USArrayTransportable Array2018-09-22 23:38:292018-10-07 15:07:072019-01-24 10:41:52
Last Chance, MT, USAMTD2247.18-106.07USArrayTransportable Array2018-09-21 19:40:552018-10-04 17:34:542019-01-24 11:11:05
Bennett, CO, USACOP2539.81-104.38USArrayTransportable Array2018-09-21 00:56:512018-10-13 21:27:542019-01-24 10:47:07
Albert Powers, OR, USAMT01142.84-124.17MOCHAMOCHA-land2018-09-20 04:01:252018-09-30 18:12:192020-03-06 17:08:22
Last Buffalo Peak, CO, USACOQ2338.96-106.00USArrayTransportable Array2018-09-20 01:20:262018-10-03 20:16:392019-01-24 10:56:38
Willow Creek, MT, USAMTB2448.53-104.05USArrayTransportable Array2018-09-19 22:14:122018-09-30 19:19:202019-01-24 10:58:10
Land of Trees, WA, USAMB01247.23-123.71MOCHAMOCHA-land2018-09-19 02:17:402018-09-28 20:46:592020-03-06 17:08:40
Signal Butte, CO, USACOQ2439.01-105.22USArrayTransportable Array2018-09-18 20:39:582018-10-03 17:39:432019-01-24 10:22:15
Hoodsport, WA, USAMB01447.27-123.21MOCHAMOCHA-land2018-09-18 19:55:312018-09-28 17:54:432020-03-06 17:08:12
Bear Creek, OR, USAMS01043.12-124.35MOCHAMOCHA-land2018-09-18 01:37:282018-09-27 17:07:052020-03-06 17:08:17
Robinson Flats, SD, USASDJ2543.45-103.82USArrayTransportable Array2018-09-15 22:18:032018-10-10 19:02:232019-01-24 11:08:58
Big Meadow, ND, USANDB2548.56-103.03USArrayTransportable Array2018-09-13 19:34:542018-10-07 18:05:132019-01-24 10:24:24
Tiny Town, CO, USACOP2439.61-105.21USArrayTransportable Array2018-09-13 14:32:062018-10-01 06:27:332019-01-24 10:28:39
ppPage: 1 of 57pp