| Автор | Molchanov, O. A. |
| Автор | Kopytenko, Yu. A. |
| Автор | Voronov, P. M. |
| Автор | Kopytenko, E. A. |
| Автор | Matiashvili, T. G. |
| Автор | Fraser‐Smith, A. C. |
| Автор | Bernardi, A. |
| Дата выпуска | 1992 |
| dc.description | The characteristics of the ULF magnetic field emissions measured at two magnetic observatories in the Republic of Georgia prior to and after the M<sub>s</sub> = 6.9 earthquake that occurred near Spitak, Armenia, on December 7, 1988, are compared with the apparently similar emissions associated with the M<sub>s</sub> = 7.1 earthquake that occurred near Loma Prieta, California, on October 17, 1989. The main features of the Spitak measurements, according to observations made at the Dusheti station (128 km to the Spitak epicenter), as compared with the Loma Prieta measurements, which were made at Corralitos, California (7 km to the Loma Prieta epicenter), are the following: (1) The intensity of ULF background activity started growing 3 to 5 days before the Spitak earthquake, whereas the corresponding increase in activity began 12 days before the Loma Prieta earthquake; (2) a substantial ULF emission burst was recorded at Dusheti starting 4 hours prior to the main shock; a similar large burst of ULF activity commenced 3 hours before the Loma Prieta event, and continued until the occurrence of the main shock; (3) ULF activity remained high for about two weeks after the Spitak earthquake, and for several months after the Loma Prieta earthquake; (4) ULF noise bursts were observed 1 to 6 hours before powerful aftershocks at Spitak during the period of enhanced activity, but there was no conclusive link between the ULF noise at Corralitos and the after‐shocks. A major difference in the ULF activity preceding the two earthquakes is a difference in amplitude (0.2 nT at Spitak and 5 nT at Loma Prieta), but this is easily explained as being caused by the different distances of the observation stations from the epicenters. |
| Формат | application.pdf |
| Копирайт | Copyright 1992 by the American Geophysical Union. |
| Тема | Radio Science |
| Тема | Radio Science: Electromagnetic noise and interference |
| Тема | Seismology |
| Тема | Seismology: Earthquake parameters |
| Тема | Seismology: Earthquake prediction |
| Название | Results of ULF magnetic field measurements near the epicenters of the Spitak (M<sub>s</sub> = 6.9) and Loma Prieta (M<sub>s</sub> = 7.1) earthquakes: Comparative analysis |
| Тип | article |
| DOI | 10.1029/92GL01152 |
| Electronic ISSN | 1944-8007 |
| Print ISSN | 0094-8276 |
| Журнал | Geophysical Research Letters |
| Том | 19 |
| Первая страница | 1495 |
| Последняя страница | 1498 |
| Аффилиация | Molchanov, O. A.; Institute of Physics of the Earth, Russian Academy of Sciences |
| Аффилиация | Kopytenko, Yu. A.; St. Petersburg Department, Institute of Earth Magnetism, Ionosphere and Wave Propagation, Russian Academy of Sciences |
| Аффилиация | Voronov, P. M.; St. Petersburg Department, Institute of Earth Magnetism, Ionosphere and Wave Propagation, Russian Academy of Sciences |
| Аффилиация | Kopytenko, E. A.; St. Petersburg Department, Institute of Earth Magnetism, Ionosphere and Wave Propagation, Russian Academy of Sciences |
| Аффилиация | Matiashvili, T. G.; Institute of Geophysics, Georgian Academy of Sciences |
| Аффилиация | Fraser‐Smith, A. C.; STAR Laboratory, Stanford University |
| Аффилиация | Bernardi, A.; Teknekron Communications Systems |
| Выпуск | 14 |
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