| Precursory specialties of apparent stresses in Yunnan earthquake series |
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| 引用本文： | 刘红桂 刘杰 丁页岭 孙业军 于昕. Precursory specialties of apparent stresses in Yunnan earthquake series[J]. 地震学报(英文版), 2006, 19(5): 497-506. DOI: 10.1007/s11589-006-0502-9 |
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| 作者姓名： | 刘红桂 刘杰 丁页岭 孙业军 于昕 |
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| 作者单位： | [1]Institute of Geophysics, China Earthquake Administration, Beijing 100081, China [2]Earthquake Administration of Jiangsu Province, Nanjing 210014, China [3]China Earthquake Networks Center, Beijing 100036, China |
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| 基金项目： | Foundation item： National Natural Science Foundation of China （40574016）, Key Project of State Science and Technology in the Eleventh Five-year Plan （2004BA601B01-04-03）, Joint Seismological Science Foundation of China （104047） and Science and Technology Project of Social Development of Jiangsu Province （BS2005069）. Contribution No. 06FE3023, Institute of Geophysics, China Earthquake Administration. |
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| 摘 要： | On the basis of the assumption that ω^2 model accords with source displacement spectra, we have obtained the mathematical expressions for calculating apparent stresses of moderate-small shocks from low-frequency flat level and comer frequency. By using digital seismic records, apparent stress values are calculated for 823 moderate-small shocks of 4 earthquake series in Yunnan area following corrections for instrument response, propagation influence and site effect. The results show that for the 4 earthquake series in Yunnan area, apparent stress hints precursory information, which means that if a moderate-small shock occurs with apparent stress larger than 1 MPa in an earthquake series, a moderate-strong earthquake will occur afterwards; and if there is not moderate-small shock with apparent stress larger than 1 MPa after a moderate-strong event in an earthquake series, strong aftershock will not occur. The research also indicates that the average apparent stress value is 0.8 MPa in Yunnan area, therefore, apparent stress is not obviously related to seismic magnitude.
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| 关 键 词： | 云南 地震 辐射能量 地应力 |
| 文章编号： | 1000-9116（2006）05-0497-10 |
| 收稿时间： | 2005-10-06 |
| 修稿时间： | 2006-07-07 |
Precursory specialties of apparent stresses in Yunnan earthquake series |
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| Liu Hong-gui , Liu Jie , Ding Ye-ling , Sun Ye-jun and Yu Xin. Precursory specialties of apparent stresses in Yunnan earthquake series[J]. Acta Seismologica Sinica(English Edition), 2006, 19(5): 497-506. DOI: 10.1007/s11589-006-0502-9 |
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| Authors: | Liu Hong-gui Liu Jie Ding Ye-ling Sun Ye-jun Yu Xin |
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| Affiliation: | (1) Institute of Geophysics, China Earthquake Administration, Beijing, 100081, China;(2) Earthquake Administration of Jiangsu Province, Nanjing, 210014, China;(3) China Earthquake Networks Center, Beijing, 100036, China |
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| Abstract: | On the basis of the assumption that ω2 model accords with source displacement spectra, we have obtained the mathematical expressions for calculating apparent stresses of moderate-small shocks from low-frequency flat level and corner frequency. By using digital seismic records, apparent stress values are calculated for 823 moderate-small shocks of 4 earthquake series in Yunnan area following corrections for instrument response, propagation influence and site effect. The results show that for the 4 earthquake series in Yunnan area, apparent stress hints precursory information, which means that if a moderate-small shock occurs with apparent stress larger than 1 MPa in an earthquake series, a moderate-strong earthquake will occur afterwards; and if there is not moderate-small shock with apparent stress larger than 1 MPa after a moderate-strong event in an earthquake series, strong aftershock will not occur. The research also indicates that the average apparent stress value is 0.8 MPa in Yunnan area, therefore, apparent stress is not obviously related to seismic magnitude. Foundation item: National Natural Science Foundation of China (40574016), Key Project of State Science and Technology in the Eleventh Five-year Plan (2004BA601B01-04-03), Joint Seismological Science Foundation of China (104047) and Science and Technology Project of Social Development of Jiangsu Province (BS2005069). Contribution No. 06FE3023, Institute of Geophysics, China Earthquake Administration |
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| Keywords: | apparent stress ω 2 model seismic radiant energy seismic moment source displacement spectra |
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