Time-Domain Electromagnetic (TEM) Data collected at Quitobaquito Spring in Organ Pipe Cactus National Monument, 2023
Time-domain electromagnetic (also known as transient electromagnetic, or TEM) data were collected to characterize the hydrogeology and groundwater depth surrounding Quitobaquito Spring and near Williams Spring. TEM surveys provide 1D resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, electrical current is cycled through a transmitter loop (Tx) wire, which in turn produces a primary magnetic field. When the current is abruptly terminated, a secondary magnetic field is induced in the earth, and it moves downward and outward as the induced current decays with time. The decay is controlled by the resistivity of the earth. A receiver (Rx) at the center of the Tx loop measures the secondary magnetic field as a function of time (dB/dt). Decaying voltage measurements at the receiver are converted to apparent resistivity, which can be inverted to recover the depth-dependent vertical resistivity structure of the earth below the receiver location. Because the 1D soundings were collected along straight transect for each line, the data can also be treated as 2D, and inverted together to create a 2D psueodosection of resistivity of the subsurface below the transect line. TEM data were collected along two lines, near Williams Spring. The lines, named WS E-W and WS N-S, refer to Williams Spring East-West transect and Williams Spring North-South transect, respectively. A total of 31 EM soundings were collected. This data release includes the GPS coordinates of each sounding, the raw data and inverted resistivity models.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[
"010:12"
]
|
| contactPoint |
{
"fn": "Jacob L. Conrad",
"@type": "vcard:Contact",
"hasEmail": "mailto:jlconrad@usgs.gov"
}
|
| description | Time-domain electromagnetic (also known as transient electromagnetic, or TEM) data were collected to characterize the hydrogeology and groundwater depth surrounding Quitobaquito Spring and near Williams Spring. TEM surveys provide 1D resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, electrical current is cycled through a transmitter loop (Tx) wire, which in turn produces a primary magnetic field. When the current is abruptly terminated, a secondary magnetic field is induced in the earth, and it moves downward and outward as the induced current decays with time. The decay is controlled by the resistivity of the earth. A receiver (Rx) at the center of the Tx loop measures the secondary magnetic field as a function of time (dB/dt). Decaying voltage measurements at the receiver are converted to apparent resistivity, which can be inverted to recover the depth-dependent vertical resistivity structure of the earth below the receiver location. Because the 1D soundings were collected along straight transect for each line, the data can also be treated as 2D, and inverted together to create a 2D psueodosection of resistivity of the subsurface below the transect line. TEM data were collected along two lines, near Williams Spring. The lines, named WS E-W and WS N-S, refer to Williams Spring East-West transect and Williams Spring North-South transect, respectively. A total of 31 EM soundings were collected. This data release includes the GPS coordinates of each sounding, the raw data and inverted resistivity models. |
| distribution |
[
{
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"title": "Digital Data",
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"accessURL": "https://doi.org/10.5066/P13COJJR",
"mediaType": "application/http",
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"title": "Original Metadata",
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|
| identifier | http://datainventory.doi.gov/id/dataset/USGS_68b7179cd4be022efaf1cca9 |
| keyword |
[
"Arizona",
"Arizona Water Science Center",
"Organ Pipe Cactus National Monument",
"Pima County",
"Quitobaquito Spring",
"USGS:68b7179cd4be022efaf1cca9",
"Williams Spring",
"electrical resistivity tomography",
"geophysics",
"hydrology",
"time domain electromagnetic",
"transient electromagnetic"
]
|
| modified | 2026-03-18T00:00:00Z |
| publisher |
{
"name": "U.S. Geological Survey",
"@type": "org:Organization"
}
|
| spatial | -113.024800, 31.955800, -113.023100, 31.959700 |
| theme |
[
"geospatial"
]
|
| title | Time-Domain Electromagnetic (TEM) Data collected at Quitobaquito Spring in Organ Pipe Cactus National Monument, 2023 |
