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Local variations of geomagnetic and geoelectric fields caused by near-surface deformationsстатья
- Автор: Surkov V.V.
- Журнал: Izvestiya, Academy of Sciences, USSR, Physics of the solid Earth
- Том: 25
- Номер: 5
- Год издания: 1989
- Первая страница: 421
- Последняя страница: 424
- Аннотация: Dynamic impacts upon geological media often create a remanent magnetic field, attributed to irreversible magnetization of rocks by impact [1-4]. Irreversible magnetization is formed in a few seconds, whereas relaxation takes several days [5-7]. The effect is usually connected with magnetization of ferromagnetic inclusions contained in low concentrations in natural rocks. It has been demonstrated, both experimentally [1-4] and theoretically [8], that the irreversible magnetization is proportional to the stress applied and is directed along the external magnetic field. Besides this cause of remanent magnetic field, we investigate here the effect created by magnetization of a casing pipe string and other metal objects in the action zone of a stress wave. We also describe the important role of the redistribution of currents because of rock deformation and destruction, which distorts geomagnetic as well as geoelectric fields.
- Добавил в систему: Сурков Вадим Вадимович