Magnetotelluric monitoring of earthquake precursors

Saraev, A.K.; Surkov, V.; Pilipenko, V.; Shlykov, A.A.; Bobrov, N.; Dembelov, M.; Zinkin, D.; Agrahari, S.

Авторы: Saraev A.K., Surkov V., Pilipenko V., Shlykov A.A., Bobrov N., Dembelov M., Zinkin D., Agrahari S.
Журнал: GeoHazards
Том: 6
Номер: 4
Год издания: 2025
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 1
Последняя страница: 16
DOI: 10.3390/geohazards6040061
Аннотация: Approaches to magnetotelluric monitoring of variations in apparent resistivity and electromagneticemission that may serve as earthquake precursors are considered. Monitoringof apparent resistivity is advised in the range 7–300 Hz, where natural electromagneticfields exhibit stable behavior, while at lower frequencies the behavior of the electrotelluricand magnetic fields should be analyzed. We present results of studies aimed at identifyingactive faults and searching for stress–strain sensitive zones for installing measurementequipment based on the registration of tidal variations in apparent resistivity. The featuresof apparent resistivity anomalies preceding earthquakes in China based on direct currentmeasurements are discussed. Based on the analysis of natural electromagnetic field monitoringin the ULF and ELF ranges in China, the anomalies recorded prior to several recentearthquakes are considered. Before the Yangbi earthquake (2017) and the series of Yangbi(2021) and Ninglang (2022) earthquakes, variations in apparent resistivity were observedthat have a pulsed behavior and probably are manifestations of electromagnetic emission.Possible sources of these anomalies are active faults located near the monitoring stations.
Добавил в систему: Сурков Вадим Вадимович

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