Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local Seismograms
In this study, we measure the seismic radiation energy, Es, and seismic moment, Mo, of twenty-two larger-sized after shocks with 5.1 < = ML < = 6.5 of the 1999 Ms 7.6 Chi-Chi, Taiwan, earthquake from high-quality digital strong-motion data recorded at stations with epicentral distances of less...
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| Format: | Article |
| Language: | English |
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Springer
2009-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
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| Online Access: |
http://tao.cgu.org.tw/images/attachments/v205p671.pdf
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| _version_ | 1818483281560076288 |
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| author | Ming-Wey Huang Jeen-Hwa Wang |
| author_facet | Ming-Wey Huang Jeen-Hwa Wang |
| author_sort | Ming-Wey Huang Jeen-Hwa Wang |
| collection | DOAJ |
| description | In this study, we measure the seismic radiation energy, Es, and seismic moment, Mo, of twenty-two larger-sized after shocks with 5.1 < = ML < = 6.5 of the 1999 Ms 7.6 Chi-Chi, Taiwan, earthquake from high-quality digital strong-motion data recorded at stations with epicentral distances of less than 50 km through a method proposed by Andrews (1986). We also eliminate the effects on the measures of Es and Mo due to site amplification and finite frequency band width limitation. Comparison of the values of Mo obtained in this study and those listed in the Harvard CMT catalogue shows that Andrews¡¦ method to measure Mo from local seismograms is acceptable. The measured values are Es = 2.0 * 10 ^18 ¡V 8.9 * 10^21 g cm^2 sec^-2 and Mo = 1.3 * 10^23 ¡V 1.4 * 10^26 g cm sec^-2 cm^-1, which give the scaled energy to be Es/Mo = 7.4 * 10^-6 ¡V 2.6 * 10^-4. The scaled energies of the 22 events are dependent upon earthquake magnitude, Ms, when both Es and Mo are evaluated from local seismograms; yet, independent of Ms when Mo is estimated from teleseismic data. Scaled energy slightly depends on the depth, h (in km), through the following form: Es/Mo = 1.92 * 10^-5e^0.09h. In addition, the corner frequency, fc, is also measured. Its value ranges from 0.15 to 1.34. The scaling law between Mo and fc is: Mo ~ fc-3.65. |
| first_indexed | 2024-12-10T11:58:12Z |
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| id | doaj.art-b943e18a53554eb18eb7e8b519c526ef |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-12-10T11:58:12Z |
| publishDate | 2009-01-01 |
| publisher | Springer |
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| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-b943e18a53554eb18eb7e8b519c526ef2022-12-22T01:49:42ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802009-01-0120567110.3319/TAO.2008.10.13.01(T)867Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local SeismogramsMing-Wey Huang Jeen-Hwa WangIn this study, we measure the seismic radiation energy, Es, and seismic moment, Mo, of twenty-two larger-sized after shocks with 5.1 < = ML < = 6.5 of the 1999 Ms 7.6 Chi-Chi, Taiwan, earthquake from high-quality digital strong-motion data recorded at stations with epicentral distances of less than 50 km through a method proposed by Andrews (1986). We also eliminate the effects on the measures of Es and Mo due to site amplification and finite frequency band width limitation. Comparison of the values of Mo obtained in this study and those listed in the Harvard CMT catalogue shows that Andrews¡¦ method to measure Mo from local seismograms is acceptable. The measured values are Es = 2.0 * 10 ^18 ¡V 8.9 * 10^21 g cm^2 sec^-2 and Mo = 1.3 * 10^23 ¡V 1.4 * 10^26 g cm sec^-2 cm^-1, which give the scaled energy to be Es/Mo = 7.4 * 10^-6 ¡V 2.6 * 10^-4. The scaled energies of the 22 events are dependent upon earthquake magnitude, Ms, when both Es and Mo are evaluated from local seismograms; yet, independent of Ms when Mo is estimated from teleseismic data. Scaled energy slightly depends on the depth, h (in km), through the following form: Es/Mo = 1.92 * 10^-5e^0.09h. In addition, the corner frequency, fc, is also measured. Its value ranges from 0.15 to 1.34. The scaling law between Mo and fc is: Mo ~ fc-3.65. http://tao.cgu.org.tw/images/attachments/v205p671.pdf Scaled energyRadiation energySeismic momentA fireshocksChi-Chi earthquake |
| spellingShingle | Ming-Wey Huang Jeen-Hwa Wang Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local Seismograms Terrestrial, Atmospheric and Oceanic Sciences Scaled energy Radiation energy Seismic moment A fireshocks Chi-Chi earthquake |
| title | Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local Seismograms |
| title_full | Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local Seismograms |
| title_fullStr | Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local Seismograms |
| title_full_unstemmed | Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local Seismograms |
| title_short | Scaled Energies of ML > = 5.1 Aftershocks of the 1999 Chi-Chi, Taiwan, Earthquake Measured from Local Seismograms |
| title_sort | scaled energies of ml 5 1 aftershocks of the 1999 chi chi taiwan earthquake measured from local seismograms |
| topic | Scaled energy Radiation energy Seismic moment A fireshocks Chi-Chi earthquake |
| url |
http://tao.cgu.org.tw/images/attachments/v205p671.pdf
|
| work_keys_str_mv | AT mingweyhuangjeenhwawang scaledenergiesofml51aftershocksofthe1999chichitaiwanearthquakemeasuredfromlocalseismograms |