摘要
计算了发生在濮阳及附近地区(35.5°~36.0°N,115.1°~115.7°E)地震的波速比,并进行T检验。结果表明,研究区内2001~2008年发生的41次ML≥2.6级地震波速比值属于正常变化。通过1970-2008年菏泽-濮阳及附近地区(35.1°~36.0°N,115.1°~115.7°E)发生的ML≥3级地震震源深度分析,发现1983年(11月7日菏泽5.9级地震前,研究区内震源深度变化大(h^-=19km),而5.9级地震后至2008年震源深度浅(h^-=13km)的特点。
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 19kin) of the earthquakes occurred before Heze 1983 Ms5. 9 earthquake are deeper than that (average of 13 kin) of earthquakes occurred after the Heze 1983 MsS. 9 earthquake.
出处
《华北地震科学》
2010年第1期31-35,共5页
North China Earthquake Sciences
基金
山东省自然科学基金项目(Y2007E09)资助