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Magneto-telluric (MT) is a geophysical method which uses natural time variation of the Earth’s magnetic and electric fields to understand geological (underground) structure and processes.
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These measurements are conducted across three major seismic sources, namely Mahendragarh-Dehradun Fault (MDF), Sohna Fault (SF) and Mathura Fault (MF).
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These measurements will ascertain the presence of fluid, which generally enhances the possibility of triggering of earthquakes.
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Why it is being done? The National Capital Region of Delhi experienced 4 small earthquakes during April – August 2020. These earthquakes were followed by a dozen of micro-events (M<3.0) including, a few aftershocks.