A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period Coda
Abstract We present a novel and robust method for estimating moment magnitudes (Mw) of large earthquakes with long‐period and long‐lasting coda energy. Fitting the energy with a simple decay model, we derive a straightforward relationship between the coda energy and the Mw. Tests with both real and...
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| Format: | Article |
| Language: | English |
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Wiley
2022-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2022GL097801 |
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| author | Xinyu Jiang Xiaodong Song |
| author_facet | Xinyu Jiang Xiaodong Song |
| author_sort | Xinyu Jiang |
| collection | DOAJ |
| description | Abstract We present a novel and robust method for estimating moment magnitudes (Mw) of large earthquakes with long‐period and long‐lasting coda energy. Fitting the energy with a simple decay model, we derive a straightforward relationship between the coda energy and the Mw. Tests with both real and synthetic data of 10 globally distributed large earthquakes (Mw > 8) verify the method and the results are stable and reliable even with a fast calculation of synthetics for a 1D model. Tests also show that the method is applicable for earthquakes with Mw above 7.5–8.0 with energy sufficiently greater than the ambient noise. The method removes or reduces the effects of geometric spreading, focal mechanism, source rupture process, and the actual Earth structure, making it advantageous for estimating the magnitudes of large earthquakes. The new long‐period coda moment magnitude (Mwo) estimations are similar to the conventional solutions but are slightly larger (by 0.04 on average). |
| format | Article |
| id | doaj-art-f776d281a51741c5a1d52bc2ffed0f77 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2022-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-f776d281a51741c5a1d52bc2ffed0f772025-01-22T14:38:16ZengWileyGeophysical Research Letters0094-82761944-80072022-06-014912n/an/a10.1029/2022GL097801A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period CodaXinyu Jiang0Xiaodong Song1School of Earth and Space Sciences Institute of Theoretical and Applied Geophysics Peking University Beijing ChinaSchool of Earth and Space Sciences Institute of Theoretical and Applied Geophysics Peking University Beijing ChinaAbstract We present a novel and robust method for estimating moment magnitudes (Mw) of large earthquakes with long‐period and long‐lasting coda energy. Fitting the energy with a simple decay model, we derive a straightforward relationship between the coda energy and the Mw. Tests with both real and synthetic data of 10 globally distributed large earthquakes (Mw > 8) verify the method and the results are stable and reliable even with a fast calculation of synthetics for a 1D model. Tests also show that the method is applicable for earthquakes with Mw above 7.5–8.0 with energy sufficiently greater than the ambient noise. The method removes or reduces the effects of geometric spreading, focal mechanism, source rupture process, and the actual Earth structure, making it advantageous for estimating the magnitudes of large earthquakes. The new long‐period coda moment magnitude (Mwo) estimations are similar to the conventional solutions but are slightly larger (by 0.04 on average).https://doi.org/10.1029/2022GL097801coda waveslarge earthquakesmoment magnitudelong periods |
| spellingShingle | Xinyu Jiang Xiaodong Song A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period Coda Geophysical Research Letters coda waves large earthquakes moment magnitude long periods |
| title | A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period Coda |
| title_full | A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period Coda |
| title_fullStr | A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period Coda |
| title_full_unstemmed | A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period Coda |
| title_short | A Method to Determine Moment Magnitudes of Large Earthquakes Based on the Long‐Period Coda |
| title_sort | method to determine moment magnitudes of large earthquakes based on the long period coda |
| topic | coda waves large earthquakes moment magnitude long periods |
| url | https://doi.org/10.1029/2022GL097801 |
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