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

Query Results: 1114 items found
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Site NameSite IDLatitudeLongitudeProjectSurveyStart Time (UTC)End Time (UTC)
Mosley Pond, KY, USAKYT4736.69-87.03USArrayTransportable Array2014-11-25 19:08:072014-12-07 19:27:50
Hurricane Branch, KY, USAKYT4536.89-88.53USArrayTransportable Array2014-11-24 17:24:282014-12-06 18:00:55
Fort Campbell, KY, USAKYT4636.69-87.78USArrayTransportable Array2014-11-23 17:01:162014-12-07 16:12:39
Deer Creek, KY, USAKYS4637.47-87.63USArrayTransportable Array2014-11-21 18:03:102014-12-06 14:55:52
Slaty Creek, KY, USAKYS4737.29-86.83USArrayTransportable Array2014-11-20 20:26:002014-12-07 21:59:10
Tranquility Wildlife Area, OH, USAOHP5038.97-83.52USArrayTransportable Array2014-11-19 17:33:192014-12-08 14:24:01
Tar Hollow, OH, USAOHO5139.38-82.75USArrayTransportable Array2014-11-18 18:41:122014-11-24 07:51:18
Flint Ridge, OH, USAOHN5139.98-82.27USArrayTransportable Array2014-11-16 19:27:302014-12-05 17:12:56
Bell Ridge, OH, USAOHM5140.54-82.06USArrayTransportable Array2014-11-13 16:34:432014-12-04 17:24:48
Whetstone Creek, OH, USAOHM5040.61-82.76USArrayTransportable Array2014-11-11 17:10:042014-12-04 14:12:04
Huron River, OH, USAOHL5041.20-82.68USArrayTransportable Array2014-11-08 20:15:122014-12-03 19:23:31
Madison County, OH, USAOHN5040.08-83.30USArrayTransportable Array2014-10-20 17:08:202014-11-05 14:48:20
Millstone Run, OH, USAOHP5138.93-82.82USArrayTransportable Array2014-10-18 16:48:202014-11-14 17:39:42
Seneca Lake, OH, USAOHN5239.89-81.40USArrayTransportable Array2014-10-17 16:04:092014-12-05 14:38:00
Atwood Lake, OH, USAOHM5240.56-81.26USArrayTransportable Array2014-10-16 21:45:572014-12-04 20:42:55
Portage County, OH, USAOHL5241.00-81.07USArrayTransportable Array2014-10-16 15:07:332014-11-13 20:44:55
Wolf Creek, OH, USAOHL5141.12-81.74USArrayTransportable Array2014-10-15 15:32:542014-11-07 18:08:48
Wabash River, OH, USAOHN4840.31-84.66USArrayTransportable Array2014-10-13 17:42:092014-12-02 21:37:37
Hog Creek, OH, USAOHM4940.73-83.72USArrayTransportable Array2014-10-12 15:42:262014-12-03 14:24:14
Youngs Creek, IN, USAREQ4738.48-86.46USArrayTransportable Array2014-10-09 20:40:582014-11-05 16:39:06
Deer Creek, OH, USAOHO5039.59-83.25USArrayTransportable Array2014-10-07 14:49:292014-10-18 20:00:41
Kiser Lake, OH, USAOHN4940.19-83.98USArrayTransportable Array2014-10-06 16:23:482014-11-12 14:22:35
Portageville, OH, USAOHL4941.35-83.52USArrayTransportable Array2014-10-05 16:28:132014-12-03 16:41:54
Thurston Ditch, IN, USAINN4740.32-85.47USArrayTransportable Array2014-10-03 16:35:232014-10-19 15:02:43
Germantown Metropark, OH, USAOHO4939.64-84.43USArrayTransportable Array2014-09-30 15:30:192014-11-15 17:13:58
Indian Fort, KY, USAKYR5037.56-84.24USArrayTransportable Array2014-09-26 20:54:462014-10-08 16:36:44
Sugar Creek, IN, USAINO4739.77-85.84USArrayTransportable Array2014-09-24 16:51:492014-10-14 13:13:41
Whitewater Park, IN, USAINO4839.61-84.98USArrayTransportable Array2014-09-23 18:00:542014-10-11 17:28:07
Putnam Forest, IN, USAINP4639.35-86.84USArrayTransportable Array2014-09-22 21:00:002014-10-02 13:25:00
Brown County Park, IN, USAINP4739.14-86.21USArrayTransportable Array2014-09-22 14:35:012014-10-11 13:17:12
Versailles Park, IN, USAINP4839.05-85.22USArrayTransportable Array2014-09-20 14:49:542014-10-10 16:48:59
Charlestown Park, IN, USAINQ4838.41-85.63USArrayTransportable Array2014-09-19 14:24:492014-10-10 13:39:08
Youngs Creek, IN, USAINQ4738.50-86.47USArrayTransportable Array2014-09-18 15:57:142014-10-09 13:45:20
Tates Hollow, IN, USAINR4737.92-86.61USArrayTransportable Array2014-09-17 18:11:342014-09-27 16:24:24
Dogwood Lake, IN, USAINQ4638.57-87.05USArrayTransportable Array2014-09-16 16:21:002014-09-28 13:26:06
Center Hill, TN, USATNU4935.97-85.71USArrayTransportable Array2014-08-20 17:34:252014-09-10 14:20:14
Dale Hollow Lake, TN, USATNT4936.49-85.55USArrayTransportable Array2014-08-19 17:42:172014-09-09 16:24:40
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
Hidden Springs, IL, USAILS4537.42-88.54USArrayTransportable Array2014-08-11 18:19:332014-09-14 15:40:41
Kleber WMA, KY, USAKYQ4938.37-84.74USArrayTransportable Array2014-08-08 19:14:372014-09-13 16:31:40
Hargis Hollow, KY, USAKYS5037.07-84.43USArrayTransportable Array2014-08-07 20:11:322014-09-10 18:56:33
Grayson Lake, KY, USAKYQ5138.18-83.02USArrayTransportable Array2014-08-06 17:35:092014-09-26 13:27:39
DeCoursey Creek, KY, USAKYP4938.95-84.49USArrayTransportable Array2014-08-05 16:50:382014-09-13 13:10:29
Cassidy Creek, KY, USAKYQ5038.29-83.95USArrayTransportable Array2014-08-02 17:27:472014-09-12 13:51:00
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 16:20:272014-09-09 19:59:21
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 17:59:472014-09-11 14:03:59
Fort Knox, KY, USAKYR4837.83-85.85USArrayTransportable Array2014-06-16 17:31:392014-08-08 04:55:37
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
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