【摘要】 2007年3月13日,福建省顺昌县郑坊乡连续发生了4.7级和4.6级两次地震,这是福建数字台网建成以来记录到的省内最大地震。这两次地震为开展福建地区的地震研究提供了极其宝贵的第一手观测资料。本文就两次地震的记录波形进行了分析,试图从中提取更多信息。结果表明:①地震记录波形中观测到首波临界距离,并据此估算出的震区附近的地壳厚度约为40km;②这两次地震的S波最大振幅比存在明显差异;③波形中分析出了清晰的sPn深度震相,并据此估算出4.7级地震的震源深度为8.4km,与其它方法测定结果一致,为正确测定震源深度提供了依据。更多还原

【Abstract】 On March 13, 2007, there were two earthquakes with M4.7 and M4.6 occurred in the Zhenfang village,Shunchang,Fujian. And the M4.7 earthquake is the maximal magnitude earthquake in the Fujian region since the Fujian Digital Seismologic Observation Network had been set up. It provides a precious information for people to research for the seismology.In this paper, wave-form of these earthquakes are analyzed and contrasted, in order to get more information from them. The result shows that: using a critical distance which Pn phase can be recorded, the crustal thickness in the region was about 40km; different stations has the differential ratio about the maximal S-wave amplitude between the earthquakes; using the data of seismologic observation networks around the region to calculate focal depth by sPn-phase,the result is about 8.4km which is consistent with the result calculated by other methods.更多还原