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Determination of focal mechanism solution using initial motion polarity of P and S waves
Physics of the Earth and Planetary Interiors, 2002Abstract It is important to determine accurate focal mechanism solutions for earthquakes with small magnitudes or those recorded by a small number of seismometers, perhaps with an unfavorable geographic distribution. A method using initial motion polarity of S waves, in addition to P waves, is described.
Masaki Nakamura
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Focal Mechanism Solutions of Intraplate Earthquakes and Stresses in the Lithosphere
1974Focal mechanism solutions of 33 intraplate earthquakes are presented. These solutions, 47 additional mechanism solutions from the literature, and measurements of stress in situ indicate that the interiors of many lithospheric plates are characterized by large horizontal compressive stress. The predominance of com-pressive stress is particularly notable
Lynn R. Sykes, Marc L. Sbar
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Tectonophysics, 1983
Abstract Focal-mechanism solutions of four earthquakes in the eastern Himalayas and northern Burma are determined using the first motion of compressional waves. Two possible solutions thus obtained for each event reveal steeply dipping fault with predominantly strike-slip motion.
S.K. Upadhyay, V.K. Ahuja, V.Sri Ram
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Abstract Focal-mechanism solutions of four earthquakes in the eastern Himalayas and northern Burma are determined using the first motion of compressional waves. Two possible solutions thus obtained for each event reveal steeply dipping fault with predominantly strike-slip motion.
S.K. Upadhyay, V.K. Ahuja, V.Sri Ram
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Focal mechanism solution of the Himalayan earthquake of February 14, 1977
Tectonophysics, 1982Abstract Through a closely spaced local network of seismic stations in Himachal Pradesh, India, supplemented by worldwide P-wave first-motion data, the source mechanism of the February 14, 1977 earthquake which occurred very close to the Rawalpindi area in Pakistan has been determined.
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Two focal-mechanism solutions for earthquakes from Iceland and Svalbard
Tectonophysics, 1977Abstract Strike-slip solutions have been obtained and are presented here for the focal mechanisms of one earthquake from Iceland and one from Svalbard, on 13 and 18 January 1976, respectively. A fault plane is suggested for the Iceland earthquake.
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Acta Seismologica Sinica, 2006
Based on P-and S-wave amplitudes and some clear initial P-wave motion data, we calculated focal mechanism solutions of 928 M≥2.5 earthquakes (1994–2005) in four sub-blocks of Sichuan and Yunnan Provinces, namely Sichuan-Qinghai, Yajiang, Central Sichuan and Central Yunnan blocks.
Wan-zheng Cheng +2 more
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Based on P-and S-wave amplitudes and some clear initial P-wave motion data, we calculated focal mechanism solutions of 928 M≥2.5 earthquakes (1994–2005) in four sub-blocks of Sichuan and Yunnan Provinces, namely Sichuan-Qinghai, Yajiang, Central Sichuan and Central Yunnan blocks.
Wan-zheng Cheng +2 more
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Focal mechanism solutions for Albanian earthquakes for the years 1964–1988
Tectonophysics, 1994Abstract Focal mechanism solutions for 175 Albanian earthquakes of Albania for the years 1964–1988 were obtained by using an interactive computer technique. The results obtained are elaborated upon by applying Fisherian statistical analysis to obtain parameters for the mean stress direction in five zones.
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Focal mechanism solutions and its tectonic significance in the trench of the eastern South China Sea
Acta Seismologica Sinica, 2005According to the activity of earthquakes and volcanoes along the Manila trench and its adjacent region, combined with analysis of focal mechanism solutions and geophysics data, the Manila trench is still being downward subduction in the depth of 200 km.
Jun-jiang Zhu +4 more
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Modern tectonic stress field in the Chinese mainland inverted from focal mechanism solutions
Acta Seismologica Sinica, 1999The inversion of modern tectonic stress field in China is made by regions on the basis of focal mechanism data in the period of 1920–1996. Results of the inversion show that the maximum principal compressive stress σ1 axis strikes nearly north-south direction in the Tibet Plateau and western China, east-west direction in North China.
Xing-Xin Du, Hui-Cheng Shao
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Acta Seismologica Sinica, 1998
The sequence characteristics and focal mechanism solution of the Jiashi, Xinjiang strong earthquake swarm are analyzed and studied in this paper. The result shows that before the MS=6.6 earthquake, value h of sequence frequency attenuation coefficient was less than 1, then value h was more than 1.
Xin Yang, Guo-Ying Gao
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The sequence characteristics and focal mechanism solution of the Jiashi, Xinjiang strong earthquake swarm are analyzed and studied in this paper. The result shows that before the MS=6.6 earthquake, value h of sequence frequency attenuation coefficient was less than 1, then value h was more than 1.
Xin Yang, Guo-Ying Gao
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