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Low frequency (LF) radio sounding for ionospheric remote sensing and earthquake prediction (case study a few earthquakes in North-West Iran) | ||
| فیزیک زمین و فضا | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 07 مهر 1403 اصل مقاله (1.11 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/jesphys.2024.375215.1007599 | ||
| نویسندگان | ||
| محسن صفری1؛ علیرضا محمودیان* 2؛ مهدی رضاپور3 | ||
| 1موسسه ژئوفیزیک دانشگاه تهران | ||
| 2استادیار، گروه فیزیک فضا، موسسه ژئوفیزیک دانشگاه نهران | ||
| 3موسسه ژئوفیزیک | ||
| چکیده | ||
| This paper presents the first low frequency (LF) radio sounding in Iran for earthquake prediction and ionospheric remote sensing purposes. Two LF signal transmitted from Turkey (162 kHz) and Tajikistan (252 kHz) are recorded in Tehran. The diurnal variation of the LF signal is averaged over one month period to remove temporal variations as a result of background ionospheric irregularities as well as pre-seismic anomalies. The capability of the International Reference Ionosphere (IRI) model in explanation of the time evolution of the received signal is examined. The morning and evening termination time manifested from amplitude of received LF signal is compared against the variation of electron density obtained along the transmitter-receiver great circle path. It has been shown that simple comparison of the averaged electron density along the signal propagation path from the transmitter to the receiver can be used to estimate the electron density during sunset and sunrise. A comprehensive method to advance the IRI estimation of the current state of the ionosphere is proposed. The LF signal anomalies associated with 4 earthquake (EQ) events in the vicinity of the propagated LF signals at 162 kHz from Turkey to Tehran is investigated. The anomalous behavior of the LF signal within +/-15 days of the EQ is studied. Daytime variation as well as sunrise and sunset offset in days approaching each event is explored as a possible indicator of pre-seismic activity. The characterization of the LF radio signal and the possibility of the earthquake prediction within Iran plateau are discussed. | ||
| کلیدواژه‌ها | ||
| low frequency؛ radio sounding؛ remote sensing؛ EQ precursors | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 223 تعداد دریافت فایل اصل مقاله: 176 |
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