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.

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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
Unrestricted Release
Project
USArray
YSRP
Lithoprobe
UofA
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
  • Lithoprobe
  • UofA
  • All
  • Southern Alberta Array 2010
  • Alberta Basement
  • Transportable Array
  • Yellowstone-Snake River Plain
  • Alberta Array 2010
  • Red Deer Conductor Array 2008
  • Backbone/Permanent Array
  • Alberta Array 2008
  • Southern Alberta Array 2009
  • British Columbia Array 2009
  • All
  • Unrestricted Release

Query Results: 1074 items found
ppPage: 1 of 11pp
Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)
Sheeps Ridge, TN, USATNU4436.32-89.56USArrayTransportable Array2014-08-13 17:41:392014-08-24 15:15:02
Rotary Park, MO, USAMOT4436.91-89.56USArrayTransportable Array2014-08-12 17:16:502014-08-23 21:02:08
Hargis Hollow, KY, USAKYS5037.07-84.43USArrayTransportable Array2014-08-07 20:11:322014-08-18 14:31:16
Grayson Lake, KY, USAKYQ5138.18-83.02USArrayTransportable Array2014-08-06 17:35:092014-08-22 13:48:01
DeCoursey Creek, KY, USAKYP4938.95-84.49USArrayTransportable Array2014-08-05 16:50:382014-08-21 16:40:04
Hamburg Hill, IL, USAILS4437.44-89.33USArrayTransportable Array2014-07-26 17:45:392014-08-10 18:47:12
Kentucky River, KY, USAKYR5137.58-83.41USArrayTransportable Array2014-06-28 15:14:222014-08-01 21:35:34
Chuck Swan Forest, TN, USATNT5136.34-83.94USArrayTransportable Array2014-06-27 16:47:202014-08-01 15:26:07
Scott Forest, TN, USATNT5036.48-84.69USArrayTransportable Array2014-06-26 16:20:272014-08-18 18:36:59
Daddys Creek, TN, USATNU5036.01-84.84USArrayTransportable Array2014-06-25 17:15:522014-07-31 18:00:14
Green River Lake, KY, USAKYS4937.29-85.34USArrayTransportable Array2014-06-19 16:22:452014-08-17 18:48:25
Wagner Hollow, KY, USAKYT4836.66-86.22USArrayTransportable Array2014-06-18 17:48:482014-07-30 14:08:02
Mammoth Cave, KY, USAKYS4837.20-86.06USArrayTransportable Array2014-06-17 17:59:472014-08-14 17:48:13
Fort Knox, KY, USAKYR4837.83-85.85USArrayTransportable Array2014-06-16 17:31:392014-07-28 17:58:01
Chaplin River, KY, USAKYR4937.75-84.99USArrayTransportable Array2014-06-15 17:46:192014-08-17 13:56:58
Green River, KY, USAKYR4637.90-87.46USArrayTransportable Array2014-06-14 16:11:202014-07-22 18:00:28
Lincoln Trail State Park, IL, USAILP4539.35-87.71USArrayTransportable Array2014-06-10 16:34:572014-07-23 18:16:44
Red Hills, IL, USAILQ4538.74-87.84USArrayTransportable Array2014-06-09 17:24:342014-07-11 13:08:41
Forbes State Park, IL, USAILQ4438.71-88.76USArrayTransportable Array2014-06-07 18:03:282014-08-16 14:18:05
Randolf County, IL, USAILR4337.98-89.81USArrayTransportable Array2014-06-06 21:51:202014-07-24 12:25:16
Wayne Fitzgerral, IL, USAILR4438.10-88.95USArrayTransportable Array2014-06-06 16:00:122014-08-10 15:17:35
Lick Creek, IL, USAILR4537.98-88.21USArrayTransportable Array2014-06-05 18:31:592014-07-08 04:35:32
Obion River, TN, USATNU4536.21-88.78USArrayTransportable Array2014-06-04 19:22:012014-08-13 21:31:19
Creech Hollow, TN, USATNU4736.08-87.27USArrayTransportable Array2014-06-03 16:05:392014-06-24 20:33:12
Nathan Bedford Forest, TN, USATNU4636.09-87.98USArrayTransportable Array2014-06-02 18:08:272014-06-24 17:07:41
Walker Hollow, MO, USAMOS4337.48-90.15USArrayTransportable Array2014-05-31 19:18:322014-06-20 16:11:46
Poplar Bluff, MO, USAMOT4336.90-90.29USArrayTransportable Array2014-05-30 20:27:432014-06-21 14:56:17
Big Creek, AR, USAARU4336.34-90.33USArrayTransportable Array2014-05-30 14:35:252014-06-21 17:44:29
Pike Creek, MO, USAMOT4236.94-91.06USArrayTransportable Array2014-05-29 15:36:362014-06-20 20:20:46
Wildcat Creek, IN, USAINN4640.42-86.38USArrayTransportable Array2013-11-09 18:09:002013-11-16 15:08:20
Kankakee Marsh, IN, USAREL4541.27-86.79USArrayTransportable Array2013-11-08 20:01:222013-11-15 19:03:56
Yellow Creek, IN, USAINL4641.55-85.95USArrayTransportable Array2013-11-07 20:03:492013-11-15 16:30:07
Pigeon Creek, IN, USAINL4741.65-85.19USArrayTransportable Array2013-11-07 16:04:462013-11-15 14:19:58
Coon Den Hollow, MO, USAMOS4137.63-91.68USArrayTransportable Array2013-11-05 20:25:542013-11-18 16:49:55
Long Branch Creek, MO, USAMOQ3838.92-93.85USArrayTransportable Array2013-11-03 20:22:302013-11-18 21:41:48
Apple Creek, IL, USAILP4239.45-90.28USArrayTransportable Array2013-11-02 21:13:232013-11-11 15:08:46
Little Brush Creek, MO, USAMOS4237.59-90.97USArrayTransportable Array2013-11-01 22:05:292013-11-13 15:58:02
Wayne Hollow, MO, USARER3938.16-93.13USArrayTransportable Array2013-10-25 18:36:312013-11-04 16:06:16
McCloud Park, IN, USAREO4639.83-86.68USArrayTransportable Array2013-10-22 17:11:382013-10-29 16:18:53
Stump Creek, MO, USAMOQ4038.83-92.17USArrayTransportable Array2013-10-21 17:21:072013-10-30 18:24:59
Walker Hollow, MO, USAMOS4037.60-92.40USArrayTransportable Array2013-10-20 17:54:152013-11-05 15:23:23
Bourbeuse River, MO, USAMOR4138.14-91.59USArrayTransportable Array2013-10-19 16:58:202013-11-12 19:36:00
Two Rivers, IL, USAILQ4238.93-90.51USArrayTransportable Array2013-10-17 21:37:312013-11-11 17:35:58
Mud Creek, IN, USAINM4641.00-86.26USArrayTransportable Array2013-10-12 18:02:502013-10-24 17:10:40
Sangamon Creek, IL, USAILP4339.43-89.30USArrayTransportable Array2013-10-11 15:05:292013-11-01 14:36:46
North Fork, IL, USAREO4340.01-89.16USArrayTransportable Array2013-10-09 16:49:022013-10-29 20:30:04
Tiffin River, OH, USAOHL4841.45-84.40USArrayTransportable Array2013-10-09 15:55:062013-10-21 16:41:36
Petobego, MI, USATTG4544.85-85.44USArrayTransportable Array2013-10-04 16:05:442013-10-20 18:45:01
Kaskaskla River, IL, USAILO4439.99-88.39USArrayTransportable Array2013-10-02 21:23:402013-10-17 20:16:54
Hidden Springs, IL, USAILP4439.32-88.68USArrayTransportable Array2013-10-02 16:24:162013-10-17 18:02:27
Weinberg-King Park, IL, USAILO4140.24-90.90USArrayTransportable Array2013-09-30 20:46:472013-10-17 15:00:59
Sugar Creek, IL, USAILQ4338.72-89.61USArrayTransportable Array2013-09-21 16:09:192013-10-22 21:58:06
Panther Creek, IL, USAILO4239.99-90.07USArrayTransportable Array2013-09-20 16:58:472013-10-16 20:00:50
North Fork, IL, USAILO4340.01-89.16USArrayTransportable Array2013-09-19 16:57:262013-09-29 20:32:06
Forest Glen, IL, USAILO4540.01-87.58USArrayTransportable Array2013-09-18 20:01:442013-10-16 15:14:51
Little Auglaize River, OH, USAOHM4840.80-84.46USArrayTransportable Array2013-09-17 16:13:232013-10-16 20:22:53
Bull Creek, IN, USAINM4740.95-85.42USArrayTransportable Array2013-09-16 15:14:162013-09-28 18:59:52
McCloud Park, IN, USAINO4639.84-86.68USArrayTransportable Array2013-09-10 17:29:562013-10-07 13:39:43
Rock Rapids, MI, USAREE4546.10-84.99USArrayTransportable Array2013-09-05 14:03:402013-10-04 20:10:44
Dowling Creek, MI, USAMIH4544.19-85.65USArrayTransportable Array2013-09-04 15:30:262013-09-23 19:31:42
Round Lake, MI, USAREG4544.81-85.29USArrayTransportable Array2013-08-30 17:29:212013-09-23 17:16:07
Holly Park, MI, USAMIJ4842.83-83.53USArrayTransportable Array2013-08-29 15:50:152013-09-24 15:14:49
Two Creeks, MI, USAMIK4842.13-84.03USArrayTransportable Array2013-08-28 16:29:142013-09-02 17:33:27
North Lake, MI, USAMIK4642.34-85.81USArrayTransportable Array2013-08-28 15:28:202013-09-09 13:12:42
Kalamazoo River, MI, USAMIK4742.17-84.80USArrayTransportable Array2013-08-27 15:18:192013-09-22 17:19:45
Hoffmaster State Park, MI, USAMIJ4543.14-86.28USArrayTransportable Array2013-08-25 17:37:322013-09-14 15:45:35
Saginaw Bay, MI, USAMIH4844.00-83.07USArrayTransportable Array2013-08-23 16:30:332013-08-31 16:01:33
Beaver Island, MI, USAMIF4445.60-85.60USArrayTransportable Array2013-08-22 17:21:472013-08-30 16:14:26
Wolcott Mill, MI, USAREJ4942.74-82.91USArrayTransportable Array2013-08-20 18:22:422013-08-26 15:13:13
Pony Creek, MI, USAMII4643.58-85.04USArrayTransportable Array2013-08-20 17:45:162013-08-26 19:03:32
Jackpine Plains, MI, USAREG4644.86-84.48USArrayTransportable Array2013-08-19 18:01:582013-08-23 19:04:08
Nelson Run, MI, USAMII4743.45-84.18USArrayTransportable Array2013-08-19 15:39:222013-09-08 13:41:16
Herron Creek, MI, USAMII4943.44-82.58USArrayTransportable Array2013-08-18 16:59:182013-08-31 13:37:24
Hiawatha Forest, MI, USAMIE4546.06-85.00USArrayTransportable Array2013-08-16 19:18:322013-08-29 18:27:26
Lake Superior Forest, MI, USAMIE4645.97-84.02USArrayTransportable Array2013-08-16 14:15:352013-09-05 18:43:22
Ocqueoc Creek, MI, USAMIF4645.45-84.14USArrayTransportable Array2013-08-15 21:42:492013-08-21 19:09:46
Wolcott Mill, MI, USAMIJ4942.77-82.94USArrayTransportable Array2013-08-15 18:06:522013-08-20 14:14:55
Black Lake Forest, MI, USAMIF4745.33-83.62USArrayTransportable Array2013-08-15 15:53:492013-08-21 17:17:27
Mackinaw Forest, MI, USAMIF4545.54-85.03USArrayTransportable Array2013-08-14 16:52:192013-08-21 18:16:00
Round Lake, MI, USAMIG4544.83-85.29USArrayTransportable Array2013-08-13 17:49:222013-08-27 15:18:59
Jackpines Plains, MI, USAMIG4644.84-84.47USArrayTransportable Array2013-08-07 16:05:332013-08-19 14:15:10
Roscommon Forest, MI, USAMIH4644.19-84.82USArrayTransportable Array2013-08-05 20:42:002013-08-17 19:24:58
Tyler Plains, MI, USAMIH4744.08-83.89USArrayTransportable Array2013-08-05 15:05:072013-08-17 16:18:34
Deford SGA, MI, USAMII4843.52-83.28USArrayTransportable Array2013-08-03 15:11:022013-08-10 18:31:14
Egypt Creek, MI, USAMIJ4643.03-85.48USArrayTransportable Array2013-08-02 15:56:312013-08-10 13:48:45
Rose Lake, MI, USAMIJ4742.82-84.40USArrayTransportable Array2013-08-01 19:08:452013-08-09 19:34:26
Pointe Mouillee, MI, USAMIK4942.02-83.22USArrayTransportable Array2013-07-31 20:48:302013-08-09 16:14:31
White River, MI, USAMII4543.56-85.88USArrayTransportable Array2013-07-25 20:04:202013-08-12 14:54:32
McGills Creek, MI, USAMIG4744.60-83.58USArrayTransportable Array2013-07-22 14:49:212013-08-17 17:56:23
Whitefish Bay, MI, USAMID4546.48-84.69USArrayTransportable Array2013-07-20 15:27:102013-08-14 17:05:18
Pomme de Terre River, MO, USAMOS3937.73-93.42USArrayTransportable Array2013-07-13 18:54:022013-07-29 16:29:54
Wayne Hollow, MO, USAMOR3938.16-93.14USArrayTransportable Array2013-07-12 18:26:582013-07-28 20:07:56
Hicklin Creek, MO, USAMOS3837.67-94.10USArrayTransportable Array2013-07-08 17:40:442013-07-28 16:42:40
Thomas Hill, MO, USAMOP3939.53-92.68USArrayTransportable Array2013-07-08 17:22:422013-07-18 19:02:05
Thousand Hills, MO, USAMOR4238.09-90.68USArrayTransportable Array2013-07-04 17:35:042013-07-27 19:07:51
Sugar Creek, MO, USAMOP4139.48-91.19USArrayTransportable Array2013-07-04 17:24:042013-07-11 14:02:24
Newberry Creek, MO, USAMOR3838.23-94.09USArrayTransportable Array2013-07-02 17:56:592013-07-10 13:23:51
Blackwater, MO, USAMOQ3938.98-92.93USArrayTransportable Array2013-07-01 16:22:502013-07-24 18:35:17
Lake of the Ozarks, MO, USAMOR4038.11-92.58USArrayTransportable Array2013-06-28 18:54:552013-07-30 13:50:29
Bunch Hollow, MO, USAMOP3839.59-93.63USArrayTransportable Array2013-06-28 17:54:342013-07-09 14:06:23
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