LIN Mei, WANG Hong-shui, JI Dong-pu, WANG feng-ji. STUDY ON VP/VS RATIO AND FOCAL DEPTH IN HEZE-PUYANG AREA[J]. North China Earthquake Sciences, 2010, 28(1): 31-35.
Citation: LIN Mei, WANG Hong-shui, JI Dong-pu, WANG feng-ji. STUDY ON VP/VS RATIO AND FOCAL DEPTH IN HEZE-PUYANG AREA[J]. North China Earthquake Sciences, 2010, 28(1): 31-35.
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STUDY ON VP/VS RATIO AND FOCAL DEPTH IN HEZE-PUYANG AREA

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    • Abstract
  • In this paper, the wave velocity ratio in the Puyang and its surrounding area(35.1°~36.0°N, 115.1°~115.7°E) is calculated and tested with T-test. The results show that the Vp/Vs ratio of this area calculated on basis of 41 ML≥2.6 earthquakes is normal in the period of 2001-2008.The focal depth of ML≥3 earthquakes occurred in Heze-Puyang and its surrounding area(35.1°~36.0°N, 115.1°~115.7°E) from 1970 to 2008 is analyzed.The result indicates that focal depth(average of 19km) of the earthquakes occurred before Heze 1983 Ms5.9 earthquake are deeper than that(average of 13 km) of earthquakes occurred after the Heze 1983 Ms5.9 earthquake.
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