Apparent resistivity (ρa) and phase (φ) varies before Yangbi MS5.1 earthquake (32km epicenter) (IMAGE)
Caption
Apparent resistivity (ρa) starts increasing in a pulsive manner about three months before Yangbi MS5.1 earthquake of March 27, 2017 at DAL station (32 km epicenter). It rises to maximum magnitude 15 days before the earthquake and then decreases to background value 3 days before the quake. The phase (φ) varies accordingly. (a) The ρa and φ at the frequency of 75 Hz are recorded for about 2 continuous years before and after the quake (the data error is less than 10%). (b) Part data cut from (a); XY and YX indicate the polarizations of the electrical field respectively along NS and EW (Han et al., 2021)
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