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 "snippet": "Seismic profiles may be computed using a source for seismic energy that is generated by the researcher (termed \"active seismic\") or seismic energy generated by natural or man-made sources in the environment (termed \"passive seismic\"). Active seismic profiles are computed using the time it takes for the generated wave to reach deployed seismometers (commonly geophones). Passive seismic profiles are computed using techniques that do not necessarily require a source location. What the profile looks like and the information it shows depends on the processing applied to the data. Seismic reflection profiles process body waves, which travel down to boundaries in the earth between rocks with different seismic velocities (such as a contact between sedimentary layers) where it is reflected back and a two way travel time is recorded. These data are processed to show the depth to multiple boundaries across the profile. Seismic refraction profiles process direct and head waves, where the head wave path is approximately horizontal and travels along the interface of two beds, before refracting back to the seismometers. The resulting seismic profile gives basic information about layer thicknesses and velocities, particularly for the upper-most layers in the subsurface. Tomography is applied to body waves or surface waves and is a direct inversion of the travel time data for seismic velocities below the profile. The result is a 2-D cross-section of seismic velocities in the earth.",
 "description": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV STYLE=\"font-size:12pt\"><P><SPAN>Seismic profiles may be computed using a source for seismic energy that is generated by the researcher (termed \"active seismic\") or seismic energy generated by natural or man-made sources in the environment (termed \"passive seismic\"). Active seismic profiles are computed using the time it takes for the generated wave to reach deployed seismometers (commonly geophones). Passive seismic profiles are computed using techniques that do not necessarily require a source location. What the profile looks like and the information it shows depends on the processing applied to the data. Seismic reflection profiles process body waves, which travel down to boundaries in the earth between rocks with different seismic velocities (such as a contact between sedimentary layers) where it is reflected back and a two way travel time is recorded. These data are processed to show the depth to multiple boundaries across the profile. Seismic refraction profiles process direct and head waves, where the head wave path is approximately horizontal and travels along the interface of two beds, before refracting back to the seismometers. The resulting seismic profile gives basic information about layer thicknesses and velocities, particularly for the upper-most layers in the subsurface. Tomography is applied to body waves or surface waves and is a direct inversion of the travel time data for seismic velocities below the profile. The result is a 2-D cross-section of seismic velocities in the earth.<\/SPAN><\/P><\/DIV><\/DIV><\/DIV>",
 "summary": "Seismic profiles may be computed using a source for seismic energy that is generated by the researcher (termed \"active seismic\") or seismic energy generated by natural or man-made sources in the environment (termed \"passive seismic\"). Active seismic profiles are computed using the time it takes for the generated wave to reach deployed seismometers (commonly geophones). Passive seismic profiles are computed using techniques that do not necessarily require a source location. What the profile looks like and the information it shows depends on the processing applied to the data. Seismic reflection profiles process body waves, which travel down to boundaries in the earth between rocks with different seismic velocities (such as a contact between sedimentary layers) where it is reflected back and a two way travel time is recorded. These data are processed to show the depth to multiple boundaries across the profile. Seismic refraction profiles process direct and head waves, where the head wave path is approximately horizontal and travels along the interface of two beds, before refracting back to the seismometers. The resulting seismic profile gives basic information about layer thicknesses and velocities, particularly for the upper-most layers in the subsurface. Tomography is applied to body waves or surface waves and is a direct inversion of the travel time data for seismic velocities below the profile. The result is a 2-D cross-section of seismic velocities in the earth.",
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